10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-K

x Annual report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the fiscal year ended March 31, 2012 or

¨ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from                      to                     

Commission file number: 001-32253

ENERSYS

(Exact name of registrant as specified in its charter)

Delaware	23-3058564
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

2366 Bernville Road

Reading, Pennsylvania 19605

(Address of principal executive offices) (Zip Code)

Registrant’s telephone number, including area code: 610-208-1991

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Name of each exchange on which registered
Common Stock, $0.01 par value per share	New York Stock Exchange

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    x  YES    ¨  NO

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    ¨  YES    x  NO

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    x  YES    ¨  NO

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (Section 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    YES  x    NO  ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (Section 229.405 of this chapter) is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer  x	Accelerated filer  ¨
Non-accelerated filer  ¨	Smaller reporting company  ¨
(Do not check if a smaller reporting company)

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).    ¨  YES    x  NO

State the aggregate market value of the voting and non-voting common equity held by non-affiliates at October 3, 2011: $953,580,148 (1) (based upon its closing transaction price on the New York Stock Exchange on September 30, 2011).

(1) For this purpose only, “non-affiliates” excludes directors and executive officers.

Common stock outstanding at May 21, 2012:                          47,945,876 Shares of Common Stock

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s definitive Proxy Statement for its Annual Meeting of Stockholders to be held on July 26, 2012 are incorporated by reference in Part III of this Annual Report.

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

The Private Securities Litigation Reform Act of 1995 (the “Reform Act”) provides a safe harbor for forward-looking statements made by or on behalf of EnerSys. EnerSys and its representatives may, from time to time, make written or verbal forward-looking statements, including statements contained in the Company’s filings with the Securities and Exchange Commission and its reports to stockholders. Generally, the inclusion of the words “anticipates,” “believe,” “expect,” “future,” “intend,” “estimate,” “anticipate,” “will,” “plans,” or the negative of such terms and similar expressions identify statements that constitute “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934 and that are intended to come within the safe harbor protection provided by those sections. All statements addressing operating performance, events, or developments that EnerSys expects or anticipates will occur in the future, including statements relating to sales growth, earnings or earnings per share growth, and market share, as well as statements expressing optimism or pessimism about future operating results, are forward-looking statements within the meaning of the Reform Act. The forward-looking statements are and will be based on management’s then-current beliefs and assumptions regarding future events and operating performance and on information currently available to management, and are applicable only as of the dates of such statements.

Forward-looking statements involve risks, uncertainties and assumptions. Although we do not make forward-looking statements unless we believe we have a reasonable basis for doing so, we cannot guarantee their accuracy. Actual results may differ materially from those expressed in these forward-looking statements due to a number of uncertainties and risks, including the risks described in this Annual Report on Form 10-K and other unforeseen risks. You should not put undue reliance on any forward-looking statements. These statements speak only as of the date of this Annual Report on Form 10-K, even if subsequently made available by us on our website or otherwise, and we undertake no obligation to update or revise these statements to reflect events or circumstances occurring after the date of this Annual Report on Form 10-K.

Our actual results may differ materially from those contemplated by the forward-looking statements for a number of reasons, including the following factors:

• general cyclical patterns of the industries in which our customers operate;

• the extent to which we cannot control our fixed and variable costs;

• the raw materials in our products may experience significant fluctuations in market price and availability;

• certain raw materials constitute hazardous materials that may give rise to costly environmental and safety claims;

• legislation regarding the restriction of the use of certain hazardous substances in our products;

• risks involved in our operations such as disruption of markets, changes in import and export laws, environmental regulations, currency restrictions and currency exchange rate fluctuations;

• our ability to raise our selling prices to our customers when our product costs increase;

• the extent to which we are able to efficiently utilize our global manufacturing facilities and optimize our capacity;

• general economic conditions in the markets in which we operate;

• competitiveness of the battery markets throughout the world;

• our timely development of competitive new products and product enhancements in a changing environment and the acceptance of such products and product enhancements by customers;

• our ability to adequately protect our proprietary intellectual property, technology and brand names;

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• litigation and regulatory proceedings to which we might be subject;

• changes in our market share in the geographic business segments where we operate;

• our ability to implement our cost reduction initiatives successfully and improve our profitability;

• quality problems associated with our products;

• our ability to implement business strategies, including our acquisition strategy, manufacturing expansion and restructuring plans;

• our acquisition strategy may not be successful in locating advantageous targets;

• our ability to successfully integrate any assets, liabilities, customers, systems and management personnel we acquire into our operations and our ability to realize related revenue synergies and cost savings within expected time frames;

• our debt and debt service requirements which may restrict our operational and financial flexibility, as well as imposing unfavorable interest and financing costs;

• our ability to maintain our existing credit facilities or obtain satisfactory new credit facilities;

• adverse changes in our short- and long-term debt levels under our credit facilities;

• our exposure to fluctuations in interest rates on our variable-rate debt;

• our ability to attract and retain qualified personnel;

• our ability to maintain good relations with labor unions;

• credit risk associated with our customers, including risk of insolvency and bankruptcy;

• our ability to successfully recover in the event of a disaster affecting our infrastructure;

• terrorist acts or acts of war, could cause damage or disruption to our operations, our suppliers, channels to market or customers, or could cause costs to increase, or create political or economic instability; and

• the security of our information systems.

This list of factors that may affect future performance is illustrative, but by no means exhaustive. Accordingly, all forward-looking statements should be evaluated with the understanding of their inherent uncertainty.

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EnerSys

Annual Report on Form 10-K

For the Fiscal Year Ended March 31, 2012

Index

		Page
PART I
Cautionary Note Regarding Forward-Looking Statements			2
Item 1.	Business		5
Item 1A.	Risk Factors		11
Item 1B.	Unresolved Staff Comments		16
Item 2.	Properties		17
Item 3.	Legal Proceedings		17
Item 4.	Mine Safety Disclosures		17
PART II
Item 5.	Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities		17
Item 6.	Selected Financial Data		20
Item 7.	Management’s Discussion and Analysis of Financial Condition and Results of Operations		21
Item 7A.	Quantitative and Qualitative Disclosures About Market Risk		45
Item 8.	Financial Statements and Supplementary Data		48
Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure		93
Item 9A.	Controls and Procedures		93
Item 9B.	Other Information		93
PART III
Item 10.	Directors, Executive Officers and Corporate Governance		94
Item 11.	Executive Compensation		94
Item 12.	Security Ownership of Certain Beneficial Owners and Management Related Stockholder Matters		94
Item 13.	Certain Relationships and Related Transactions, and Director Independence		94
Item 14.	Principal Accounting Fees and Services		95
PART IV
Item 15.	Exhibits, Financial Statement Schedules		96
	Signatures		100

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PART I

ITEM 1. BUSINESS

Overview

EnerSys (the “Company,” “we,” or “us”) is the world’s largest manufacturer, marketer and distributor of industrial batteries. We also manufacture, market and distribute related products such as chargers, power equipment and battery accessories, and we provide related after-market and customer-support services for industrial batteries. We market and sell our products globally to over 10,000 customers in more than 100 countries through a network of distributors, independent representatives and our internal sales force.

We operate and manage our business in three geographic regions of the world—Americas, Europe and Asia, as described below. Our business is highly decentralized with manufacturing locations throughout the world. More than half of our manufacturing capacity is located outside of the United States, and approximately 60% of our net sales were generated outside of the United States. The Company has three reportable business segments based on geographic regions, defined as follows:

• Americas, which includes North and South America, with our segment headquarters in Reading, Pennsylvania, USA,

• Europe, which includes Europe, the Middle East and Africa, with our segment headquarters in Zurich, Switzerland, and

• Asia, which includes Asia, Australia and Oceania, with our segment headquarters in Singapore.

We have two primary industrial battery product lines: reserve power products and motive power products. Net sales classifications by product line are as follows:

• Reserve power products are used for backup power for the continuous operation of critical applications in telecommunications systems, uninterruptible power systems, or “UPS” applications for computer and computer-controlled systems, and other specialty power applications, including security systems, premium starting, lighting and ignition applications, in switchgear, electrical control systems used in electric utilities and energy pipelines, in commercial aircraft, satellites, military aircraft, submarines, ships, tactical vehicles and portable energy packs.

• Motive power products are used to provide power for manufacturing, warehousing and other material handling equipment, primarily electric industrial forklift trucks, mining equipment, diesel locomotive starting and other rail equipment.

Additionally, see Note 23 to the Consolidated Financial Statements for information on segment reporting.

Fiscal Year Reporting

In this Annual Report on Form 10-K, when we refer to our fiscal years, we state “fiscal” and the year, as in “fiscal 2012”, which refers to our fiscal year ended March 31, 2012. The Company reports interim financial information for 13-week periods, except for the first quarter, which always begins on April 1, and the fourth quarter, which always ends on March 31. The four quarters in fiscal 2012 ended on July 3, 2011, October 2, 2011, January 1, 2012, and March 31, 2012, respectively. The four quarters in fiscal 2011 ended on July 4, 2010, October 3, 2010, January 2, 2011, and March 31, 2011, respectively.

History

EnerSys and its predecessor companies have been manufacturers of industrial batteries for over 100 years. Morgan Stanley Capital Partners teamed with the management of Yuasa, Inc. in late 2000 to acquire from Yuasa Corporation (Japan) its reserve power and motive power battery businesses in North and South America. We

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were incorporated in October 2000 for the purpose of completing the Yuasa, Inc. acquisition. On January 1, 2001, we changed our name from Yuasa, Inc. to EnerSys to reflect our focus on the energy systems nature of our businesses.

In 2004, EnerSys completed its initial public offering (the “IPO”). The Company’s Registration Statement (SEC File No. 333-115553) for its IPO was declared effective by the Securities and Exchange Commission (the “SEC”) and the Company’s common stock commenced trading on the New York Stock Exchange, under the trading symbol “ENS.”

Key Developments

There have been several key stages in the development of our business, which explain to a significant degree our results of operations over the past several years.

In March 2002, we acquired the reserve power and motive power business of the Energy Storage Group of Invensys plc. (“ESG”). Our successful integration of ESG provided global scale in both the reserve and motive power markets. The ESG acquisition also provided us with a further opportunity to reduce costs and improve operating efficiency that, among other initiatives, led to closing underutilized manufacturing plants, distribution facilities, sales offices and eliminating other redundant costs, including staff.

During fiscal years 2003 through 2010, we acquired fifteen battery businesses around the globe.

During fiscal 2011, we made three acquisitions, the most significant of which was the acquisition of a lithium-ion battery business, ABSL Power Solutions Ltd. (“ABSL”). We also expanded thin-plate pure-lead technology (“TPPL”) capacity at our facilities in Warrensburg, MO and Newport, UK.

During fiscal 2012, we made four acquisitions. In South America, we acquired the reserve power and motive power battery business of Industrial Battery Holdings, S.A., the parent company of EnerSystem (“EnerSystem”). In South Africa and India, we entered into joint ventures where we acquired a majority ownership in the reserve power and motive power businesses of Powertech Battery, which is a part of Allied Electronics Corporation Limited (Altron), in South Africa and Energy Leader Batteries India Limited (“Energy Leader”) in India. We also launched a joint venture with Lithium Technology Corporation (“LTC”) in Germany, to produce large format lithium-ion battery cells.

Liquidity and Capital Resources

We believe that our financial position is strong and we have substantial liquidity with $160 million of available cash and cash equivalents and undrawn committed and uncommitted credit lines of approximately $377 million at March 31, 2012 to cover short-term liquidity requirements. Our $350 million 2011 senior secured revolving credit facility (“2011 Credit Facility”), which we entered into in March 2011, is committed through March 2016 as long as we continue to comply with its covenants and conditions. The facility includes an early termination provision under which the Company is required to meet a liquidity test in February 2015 related to its capacity to meet certain potential funding obligations of the $172.5 million senior unsecured 3.375% convertible notes (“Convertible Notes”) in June 2015 at a conversion price of $40.60. It is our current intent to settle the principal amount of any such conversion in cash, and any additional optional conversions in cash, shares of EnerSys common stock or a combination of cash and shares. The credit facility and significant cash balances allows us considerable flexibility to fund both our organic growth as well as strategic acquisitions.

Other than the 2011 Credit Facility and the Convertible Notes, we have no other significant amount of debt maturing in the near future.

(See Liquidity and Capital Resources in Item 7 MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS and Note 8 in Notes to Consolidated Financial Statements in Item 8).

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Our Customers

We serve over 10,000 customers in over 100 countries, on a direct basis or through our distributors. We are not overly dependent on any particular end market. Our customer base is highly diverse and no single customer accounts for more than 5% of our revenues.

Our reserve power customers consist of regional customers as well as global customers. These customers are in diverse markets including telecom, UPS, electric utilities, security systems, emergency lighting, premium starting, lighting and ignition applications and space satellites. In addition, we sell our aerospace and defense products in numerous countries, including the governments of the U.S., Germany and the U.K. and to major defense and aviation original equipment manufacturers (“OEMs”).

Our motive power products are sold to a large, diversified customer base. These customers include material handling equipment dealers, OEMs and end users of such equipment. End users include manufacturers, distributors, warehouse operators, retailers, airports, mine operators and railroads.

Distribution and Services

We distribute, sell and service reserve power products globally through a combination of company-owned offices, independent manufacturers’ representatives and distributors. With our global manufacturing locations and regional warehouses, we believe we are well positioned to meet our customers’ delivery and servicing requirements. We have targeted our approach to meet local market conditions, which we believe provides the best possible service for our regional customers and our global accounts.

We distribute, sell and service motive power products throughout the world, principally through company-owned sales and service facilities, as well as through independent manufacturers’ representatives. We believe we are one of the only battery manufacturers in the motive power battery industry that operates a primarily company-owned service network. This company owned network allows us to offer high-quality service, including preventative maintenance programs and customer support. Our warehouses and service locations enable us to respond quickly to customers in the markets we serve. We believe that the extensive industry experience of our sales organization results in strong long-term customer relationships.

Manufacturing and Raw Materials

We manufacture and assemble our products at manufacturing facilities located in the Americas, Europe and Asia. With a view toward projected demand, we strive to optimize and balance capacity at our battery manufacturing facilities globally, while simultaneously minimizing our product cost. By taking a global view of our manufacturing requirements and capacity, we are better able to anticipate potential capacity bottlenecks and equipment and capital funding needs.

The primary raw materials used to manufacture our products include lead, plastics, steel and copper. We purchase lead from a number of leading suppliers throughout the world. Because lead is traded on the world’s commodity markets and its price fluctuates daily, we periodically enter into hedging arrangements for a portion of our projected requirements to reduce the volatility of our costs.

Competition

The industrial battery market is highly competitive both among competitors who manufacture and sell industrial batteries and among customers who purchase industrial batteries. Our competitors range from development stage companies to large domestic and international corporations. Certain of our competitors produce energy storage products utilizing technologies that we do not possess at this time. We compete primarily on the basis of reputation, product quality, reliability of service, delivery and price. We believe that our products and services are competitively priced.

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Europe

We believe that we have the largest market share in the European industrial battery market. We compete with Exide Technologies, Hoppecke, FIAMM, NorthStar Battery, SAFT as well as Chinese producers in the reserve products market; and Exide Technologies, Hoppecke and Midac in the motive products market.

Americas

We believe that we have the largest market share in the Americas industrial battery market. We compete principally with Exide Technologies and East Penn Manufacturing in the reserve and motive products markets; and C&D Technologies Inc., NorthStar Battery, SAFT and EaglePicher (OM Group) in the reserve products market.

Asia

We have a small share of the fragmented Asian industrial battery market. We compete principally with GS-Yuasa, Shin-Kobe and Zibo Torch in the motive products market and Coslight, Amara Raja, Narada, Leoch, Exide Industries and China Shoto in the reserve products market.

Warranties

Warranties for our products vary geographically and by product type and are competitive with other suppliers of these types of products. Generally, our reserve power product warranties range from one to twenty years and our motive power product warranties range from one to seven-years. The length of our warranties are varied to reflect regional characteristics and competitive influences. In some cases, our warranty period may include a pro rata period, which is typically based around the design life of the product and the application served. Our warranties generally cover defects in workmanship and materials and are limited to specific usage parameters.

Intellectual Property

We have numerous patents and patent licenses in the United States and other jurisdictions but do not consider any one patent to be material to our business. From time to time, we apply for patents on new inventions and designs, but we believe that the growth of our business will depend primarily upon the quality of our products and our relationships with our customers, rather than the extent of our patent protection.

Although other manufacturers may possess certain TPPL technology, we believe we are the only manufacturer of products using this technology in the reserve and motive power markets. Some aspects of this technology may be patented in the future. In any event, we believe that a significant capital investment would be required by any party desiring to produce products using TPPL technology for our markets.

We own or possess exclusive and non-exclusive licenses and other rights to use a number of trademarks in various jurisdictions. We have obtained registrations for many of these trademarks in the United States and other jurisdictions. Our various trademark registrations currently have durations of approximately 10 to 20 years, varying by mark and jurisdiction of registration and may be renewable. We endeavor to keep all of our material registrations current. We believe that many such rights and licenses are important to our business by helping to develop strong brand-name recognition in the marketplace. Some of the significant (registered and unregistered) trademarks that we use include: ArmaSafePlus, Battery Technologies, Cyclon, DataSafe, Deserthog, Douglas Battery, Douglas Legacy, EAS, Energia, EnerSystem, Energy Leader, FIAMM Motive Power, General Battery, Genesis, Hawker, Huada, HUP, Ironclad, LifeGuard, LifePlus, Life Speed, LifeTech, Loadhog, Odyssey, Oerlikon Battery, Oldham, Perfect Plus, PowerGuard, PowerSafe, ProSeries, Redion, Smarthog, Superhog, Supersafe, TeleData, Waterless, Wi-IQ, Workhog and XFC.

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Today, our reserve power batteries are marketed and sold principally under the ABSL, ABSL Power, ABSL Space, ArmaSafePlus, Cyclon, DataSafe, Genesis, Hawker, Huada, Odyssey, Oerlikon Battery, PowerSafe and SuperSafe brands. Our motive power batteries are marketed and sold principally under the Douglas Battery, Express, Fiamm Motive Power, General Battery, Hawker, Huada and Ironclad brands. We also manufacture and sell related “DC” (Direct Current) power products including chargers, electronic power equipment and a wide variety of battery accessories. Our battery products span a broad range of sizes, configurations and electrical capacities, enabling us to meet a wide variety of customer applications.

Seasonality

Our business generally does not experience significant quarterly fluctuations in net sales as a result of weather or other trends that can be directly linked to seasonality patterns. However, our earnings are impacted by our summer manufacturing shutdowns and holidays primarily in the Americas and Western Europe.

Product and Process Development

Our product and process development efforts are focused on the creation and optimization of new battery products using existing technologies, which, in certain cases, differentiate our stored energy solutions from that of our competition. We allocate our resources to the following key areas:

• the design and development of new products;

• optimizing and expanding our existing product offering;

• waste and scrap reduction;

• production efficiency and utilization;

• capacity expansion without additional facilities; and

• quality attribute maximization.

Employees

At March 31, 2012, we had approximately 9,200 employees. Of these employees, approximately 40% were covered by collective bargaining agreements. The average term of these agreements is two years, with the longest term being four years. These agreements expire over the period from calendar years 2012 to 2014.

We consider our employee relations to be good. Historically, we have not experienced any significant labor unrest or disruption of production. However, during our second quarter of fiscal 2012, we were affected by a three-week strike at our manufacturing plant in Poland.

Environmental Matters

In the manufacture of our products throughout the world, we process, store, dispose of and otherwise use large amounts of hazardous materials, especially lead and acid. As a result, we are subject to extensive and evolving environmental, health and safety laws and regulations governing, among other things: the generation, handling, storage, use, transportation and disposal of hazardous materials; emissions or discharges of hazardous materials into the ground, air or water; and the health and safety of our employees. In addition, we are required to comply with the regulation issued from the European Economic Union called Registration, Evaluation, Authorization and Restriction of Chemicals or “REACH,” that came into force on June 1, 2007. Under the regulation, companies which manufacture or import more than one ton of a chemical substance per year are required to register it in a central database administered by the European Chemicals Agency. REACH requires a registration over a period of 11 years. Compliance with these laws and regulations results in ongoing costs. Failure to comply with these laws and regulations, or to obtain or comply with required environmental permits,

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could result in fines, criminal charges or other sanctions by regulators. From time to time, we have had instances of alleged or actual noncompliance that have resulted in the imposition of fines, penalties and required corrective actions. Our ongoing compliance with environmental, health and safety laws, regulations and permits could require us to incur significant expenses, limit our ability to modify or expand our facilities or continue production and require us to install additional pollution control equipment and make other capital improvements. In addition, private parties, including current or former employees, can bring personal injury or other claims against us due to the presence of, or their exposure to, hazardous substances used, stored, transported or disposed of by us or contained in our products.

Certain environmental laws assess liability on owners or operators of real property for the cost of investigation, removal or remediation of hazardous substances at their current or former properties or at properties at which they have disposed of hazardous substances. These laws may also assess costs to repair damage to natural resources. We may be responsible for remediating damage to our properties that was caused by former owners. Soil and groundwater contamination has occurred at some of our current and former properties and may occur or be discovered at other properties in the future. In addition, we have been and may in the future, be liable to contribute to the cleanup of locations owned or operated by other persons to which we or our predecessor companies have sent wastes for disposal, pursuant to federal and other environmental laws. Under these laws, the owner or operator of contaminated properties and companies that generated, disposed of or arranged for the disposal of wastes sent to a contaminated disposal facility can be held jointly and severally liable for the investigation and cleanup of such properties, regardless of fault.

Sumter, South Carolina

We currently are responsible for certain environmental obligations at our former battery facility in Sumter, South Carolina that predate our ownership of this facility. This battery facility was closed in 2001 and is separate from our current metal fabrication facility in Sumter. We have established a reserve for this facility that totaled $3.0 million as of March 31, 2012. Based on current information, we believe this reserve is adequate to satisfy our environmental liabilities at this facility.

Jiangsu Province, China

In September 2011, the Company’s facility in Jiangsu Province, China, was closed by government authorities for an environmental review. After completion of the review, the government authorities allowed the plant to reopen in November 2011 on a conditional basis, with the understanding we would work with the assistance of the government agencies to relocate to a more preferable location.

Environmental and safety certifications

Thirteen of our facilities in the United States, Europe and Asia are certified to ISO 14001 standards. ISO 14001 is a globally recognized, voluntary program that focuses on the implementation, maintenance and continual improvement of an environmental management system and the improvement of environmental performance. Two facilities in Europe and one in Africa are certified to OHSAS 18001 standards.

Quality Systems

We utilize a global strategy for quality management systems, policies and procedures, the basis of which is the ISO 9001:2000 standard, which is a worldwide recognized quality standard. We believe in the principles of this standard and reinforce this by requiring mandatory compliance for all manufacturing, sales and service locations that are registered to the ISO 9001 standard. This strategy enables us to provide consistent quality products and services to meet our customers’ needs.

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Available Information

We file annual, quarterly and current reports, proxy statements and other information with the SEC. These filings are available to the public on the Internet at the SEC’s website at http://www.sec.gov. You may also read and copy any document we file with the SEC at the SEC’s public reference room, located at 100 F Street, N.E., Room 1580, Washington, D.C. 20549. Please call the SEC at 1-800-SEC-0330 for further information on the public reference room.

Our Internet address is http://www.enersys.com. We make available free of charge on http://www.enersys.com our annual, quarterly and current reports, and amendments to those reports, as soon as reasonably practical after we electronically file such material with, or furnish it to, the SEC.

ITEM 1A. RISK FACTORS

The following risks and uncertainties, as well as others described in this Annual Report on Form 10-K, could materially and adversely affect our business, our results of operations and financial conditions and could cause actual results to differ materially from our expectations and projections. Stockholders are cautioned that these and other factors, including those beyond our control, may affect future performance and cause actual results to differ from those which may, from time to time, be anticipated. There may be additional risks that are not presently material or known. See “Cautionary Note Regarding Forward-Looking Statements.” All forward-looking statements made by us or on our behalf are qualified by the risks described below.

We operate in an extremely competitive industry and are subject to pricing pressures.

We compete with a number of major international manufacturers and distributors, as well as a large number of smaller, regional competitors. Due to excess capacity in some sectors of our industry and consolidation among industrial battery purchasers, we have been subjected to significant pricing pressures. We anticipate continued competitive pricing pressure as foreign producers are able to employ labor at significantly lower costs than producers in the U.S. and Western Europe, expand their export capacity and increase their marketing presence in our major Americas and European markets. Several of our competitors have strong technical, marketing, sales, manufacturing, distribution and other resources, as well as significant name recognition, established positions in the market and long-standing relationships with OEMs and other customers. In addition, certain of our competitors own lead smelting facilities which, during periods of lead cost increases or price volatility, may provide a competitive pricing advantage and reduce their exposure to volatile raw material costs. Our ability to maintain and improve our operating margins has depended, and continues to depend, on our ability to control and reduce our costs. We cannot assure you that we will be able to continue to reduce our operating expenses, to raise or maintain our prices or increase our unit volume, in order to maintain or improve our operating results.

The uncertainty in global economic conditions could negatively affect the Company’s operating results.

Our operating results are directly affected by the general global economic conditions of the industries in which our major customer groups operate. Our business segments are highly dependent on the economic and market conditions in each of the geographic areas in which we operate. Our products are heavily dependent on the end markets that we serve and our operating results will vary by geographic segment, depending on the economic environment in these markets. Sales of our motive power products, for example, depend significantly on demand for new electric industrial forklift trucks, which in turn depends on end-user demand for additional motive capacity in their distribution and manufacturing facilities. The uncertainty in global economic conditions varies by geographic segment, and can result in substantial volatility in global credit markets, particularly in the United States, where we service the vast majority of our debt. These conditions affect our business by reducing prices that our customers may be able or willing to pay for our products or by reducing the demand for our products, which could in turn negatively impact our sales and earnings generation and result in a material adverse effect on our business, cash flow, results of operations and financial position.

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Risk of forced conversion of Convertible Notes which could adversely affect the Company’s liquidity.

Under the terms of our Convertible Notes, a holder of Convertible Notes may require the Company to repurchase some or all of the holder’s Convertible Notes for cash upon the occurrence of a fundamental change as defined in the indenture and on each of June 1, 2015, 2018, 2023, 2028 and 2033 at a price equal to 100% of the accreted principal amount of the Convertible Notes being repurchased, plus accrued and unpaid interest, if any, in each case. As of March 31, 2012, the Company has $172.5 million of Convertible Notes outstanding.

It is the Company’s current intent to settle the principal amount of any such conversions in cash, and any additional optional conversions in cash, shares of EnerSys common stock or a combination of cash and shares. The Company expects to have available sufficient liquidity to satisfy any such settlement or optional put or conversion. The Convertible Notes will mature on June 1, 2038, unless earlier converted, redeemed or repurchased by the Company.

Reliance on third party relationships and derivative agreements could adversely affect the Company’s business.

We depend on third parties, including suppliers, distributors, lead toll operators, freight forwarders, insurance brokers, commodity brokers, major financial institutions and other third party service providers, for key aspects of our business including the provision of derivative contracts to manage risks of: (a) lead cost volatility, (b) foreign currency exposures and (c) interest rate volatility on a portion of our long-term floating-rate debt. Failure of these third parties to meet their contractual, regulatory and other obligations to the Company or the development of factors that materially disrupt our relationships with these third parties could expose us to the risks of higher lead costs, unfavorable foreign currency rates and higher interest expenses, which could have a material adverse effect on our business.

Our raw materials costs are volatile and expose us to significant movements in our product costs.

Lead is our most significant raw material and is used along with significant amounts of plastics, steel, copper and other materials in our manufacturing processes. We estimate that raw material costs account for over half of our cost of goods sold. The costs of these raw materials, particularly lead, are volatile and beyond our control.

Volatile raw material costs can significantly affect our operating results and make period-to-period comparisons extremely difficult. We cannot assure you that we will be able to hedge the costs of our raw material requirements at a reasonable level or pass on to our customers the increased costs of our raw materials.

Our operations expose us to the risk of material environmental, health and safety liabilities, costs, and litigation.

In the manufacture of our products throughout the world, we process, store, dispose of and otherwise use large amounts of hazardous materials, especially lead and acid. As a result, we are subject to extensive and changing environmental, health and safety laws and regulations governing, among other things: the generation, handling, storage, use, transportation and disposal of hazardous materials; remediation of polluted ground or water; emissions or discharges of hazardous materials into the ground, air or water; and the health and safety of our employees. Compliance with these laws and regulations results in ongoing costs. Failure to comply with these laws or regulations, or to obtain or comply with required environmental permits, could result in fines, criminal charges or other sanctions by regulators. From time to time we have had instances of alleged or actual noncompliance that have resulted in the imposition of fines, penalties and required corrective actions. Our ongoing compliance with environmental, health and safety laws, regulations and permits could require us to incur significant expenses, limit our ability to modify or expand our facilities or continue production and require us to install additional pollution control equipment and make other capital improvements. In addition, private parties, including current or former employees, could bring personal injury or other claims against us due to the presence of, or exposure to, hazardous substances used, stored or disposed of by us or contained in our products.

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Certain environmental laws assess liability on owners or operators of real property for the cost of investigation, removal or remediation of hazardous substances at their current or former properties or at properties at which they have disposed of hazardous substances. These laws may also assess costs to repair damage to natural resources. We may be responsible for remediating damage to our properties that was caused by former owners. Soil and groundwater contamination has occurred at some of our current and former properties and may occur or be discovered at other properties in the future. We are currently investigating and monitoring soil and groundwater contamination at several of our properties, in most cases as required by regulatory permitting processes. We may be required to conduct these operations at other properties in the future. In addition, we have been and in the future may be liable to contribute to the cleanup of locations owned or operated by other persons to which we or our predecessor companies have sent wastes for disposal, pursuant to federal and other environmental laws. Under these laws, the owner or operator of contaminated properties and companies that generated, disposed of or arranged for the disposal of wastes sent to a contaminated disposal facility can be held jointly and severally liable for the investigation and cleanup of such properties, regardless of fault.

We cannot assure you that we have been or at all times will be in compliance with environmental laws and regulations or that we will not be required to expend significant funds to comply with, or discharge liabilities arising under, environmental laws, regulations and permits, or that we will not be exposed to material environmental, health or safety litigation.

We are exposed to exchange rate risks, and our net income and financial condition may suffer due to currency translations.

We invoice our foreign sales and service transactions in local and foreign currencies and translate net sales using actual exchange rates during the period. We translate our non-U.S. assets and liabilities into U.S. dollars using current exchange rates as of the balance sheet date. Because a significant portion of our revenues and expenses are denominated in foreign currencies, changes in exchange rates between the U.S. dollar and foreign currencies, primarily the euro, British pound, Polish zloty and Swiss franc may adversely affect our revenue, cost of revenue and operating margins. For example, foreign currency depreciation against the U.S. dollar will reduce the value of our foreign revenues and operating earnings as well as reduce our net investment in foreign subsidiaries. Approximately 60% of net sales were generated outside of the United States for the last three fiscal years.

Most of the risk of fluctuating foreign currencies is in our Europe segment, which comprised just under 50% of our net sales during the last two fiscal years. The euro is the dominant currency in our European operations.

The translation impact from currency fluctuations on net sales and operating earnings in Americas and Asia segments are not significant, as a substantial majority of these net sales and operating earnings are in U.S. dollars or foreign currencies that have been closely correlated to the U.S. dollar.

If foreign currencies depreciate against the U.S. dollar, it would make it more expensive for our non-U.S. subsidiaries to purchase certain of our raw material commodities that are priced globally in U.S. dollars, while the related revenue will decrease when translated to U.S. dollars. Significant movements in foreign exchange rates can have a material impact on our results of operations and financial condition. We periodically engage in hedging of our foreign currency exposures, but cannot assure you that we can successfully hedge all of our foreign currency exposures or do so at a reasonable cost.

We manufacture and assemble our products globally in the Americas, Europe and Asia. Approximately 60% of our sales and expenses are translated in foreign currencies. Our sales revenue, production costs, profit margins and competitive position are affected by the strength of the currencies in countries where we manufacture or purchase goods relative to the strength of the currencies in countries where our products are sold. Additionally, our business could be negatively impacted if some of our competitors manufacture in countries that have a depreciating currency versus the currency in countries where we manufacture. Also, as we report our financial statements in the U.S. dollar, our financial results are affected by the strength of the currencies in countries where we have operations relative to the strength of the U.S. dollar. The principal foreign currencies in which we conduct business are the euro, British pound, Polish zloty, Chinese renminbi and Mexican peso.

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We quantify and monitor our global foreign currency exposures. Our largest foreign currency exposure is from the purchase and conversion of U.S. dollar based lead costs into local currencies in Europe. Additionally, we have currency exposures from intercompany financing and trade transactions. On a selective basis, we enter into foreign currency forward contracts and option contracts to reduce the impact from the volatility of currency movements; however, we cannot be certain that foreign currency fluctuations will not impact our operations in the future.

Our international operations may be adversely affected by actions taken by foreign governments or other forces or events over which we may have no control.

We currently have significant manufacturing and/or distribution facilities outside of the United States, in Argentina, Australia, Belgium, Brazil, Canada, Bulgaria, China, the Czech Republic, France, Germany, India, Italy, Mexico, Poland, South Africa, Spain, Switzerland, Tunisia and the United Kingdom. We may face political instability, economic uncertainty, and/or difficult labor relations in our foreign operations. We also may face barriers in the form of long-standing relationships between potential customers and their existing suppliers, national policies favoring domestic manufacturers and protective regulations including exchange controls, restrictions on foreign investment or the repatriation of profits or invested capital, changes in export or import restrictions and changes in the tax system or rate of taxation in countries where we do business. We cannot assure you that we will be able to successfully develop and expand our international operations and sales or that we will be able to overcome the significant obstacles and risks of our international operations.

Our failure to introduce new products and product enhancements and broad market acceptance of new technologies introduced by our competitors could adversely affect our business.

Many new energy storage technologies have been introduced over the past several years. For certain important and growing markets, such as aerospace and defense, lithium-based battery technologies have a large and growing market share. Our ability to achieve significant and sustained penetration of key developing markets, including aerospace and defense, will depend upon our success in developing or acquiring these and other technologies, either independently, through joint ventures or through acquisitions. If we fail to develop or acquire, and manufacture and sell, products that satisfy our customers’ demands, or we fail to respond effectively to new product announcements by our competitors by quickly introducing competitive products, then market acceptance of our products could be reduced and our business could be adversely affected. We cannot assure you that our lead-acid products will remain competitive with products based on new technologies.

We may not be able to adequately protect our proprietary intellectual property and technology.

We rely on a combination of copyright, trademark, patent and trade secret laws, non-disclosure agreements and other confidentiality procedures and contractual provisions to establish, protect and maintain our proprietary intellectual property and technology and other confidential information. Certain of these technologies, especially TPPL technology, are important to our business and are not protected by patents. Despite our efforts to protect our proprietary intellectual property and technology and other confidential information, unauthorized parties may attempt to copy or otherwise obtain and use our intellectual property and proprietary technologies.

Relocation of our customers’ operations could adversely affect our business.

The trend by a number of our North American and Western European customers to move manufacturing operations and expand their businesses in faster growing and low labor-cost markets may have an adverse impact on our business. As our customers in traditional manufacturing-based industries seek to move their manufacturing operations to these locations, there is a risk that these customers will source their energy storage products from competitors located in those territories and will cease or reduce the purchase of products from our manufacturing plants. We cannot assure you that we will be able to compete effectively with manufacturing operations of energy storage products in those territories, whether by establishing or expanding our manufacturing operations in those lower-cost territories or acquiring existing manufacturers.

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We may fail to implement our cost reduction initiatives successfully and improve our profitability.

We must continue to implement cost reduction initiatives to achieve additional cost savings in future periods. We cannot assure you that we will be able to achieve all of the cost savings that we expect to realize from current or future initiatives. In particular, we may be unable to implement one or more of our initiatives successfully or we may experience unexpected cost increases that offset the savings that we achieve. Given the continued competitive pricing pressures experienced in our industry, our failure to realize cost savings would adversely affect our results of operations.

Quality problems with our products could harm our reputation and erode our competitive position.

The success of our business will depend upon the quality of our products and our relationships with customers. In the event that our products fail to meet our customers’ standards, our reputation could be harmed, which would adversely affect our marketing and sales efforts. We cannot assure you that our customers will not experience quality problems with our products.

We offer our products under a variety of brand names, the protection of which is important to our reputation for quality in the consumer marketplace.

We rely upon a combination of trademark, licensing and contractual covenants to establish and protect the brand names of our products. We have registered many of our trademarks in the U.S. Patent and Trademark Office and in other countries. In many market segments, our reputation is closely related to our brand names. Monitoring unauthorized use of our brand names is difficult, and we cannot be certain that the steps we have taken will prevent their unauthorized use, particularly in foreign countries where the laws may not protect our proprietary rights as fully as in the U.S. We cannot assure you that our brand names will not be misappropriated or utilized without our consent or that such actions will not have a material adverse effect on our reputation and on our results of operations.

We may fail to implement our plans to make acquisitions or successfully integrate them into our operations.

As part of our business strategy, we have grown, and plan to continue growing, by acquiring other product lines, technologies or facilities that complement or expand our existing business. There is significant competition for acquisition targets in the industrial battery industry. We may not be able to identify suitable acquisition candidates or negotiate attractive terms. In addition, we may have difficulty obtaining the financing necessary to complete transactions we pursue. In that regard, our credit facilities restrict the amount of additional indebtedness that we may incur to finance acquisitions and place other restrictions on our ability to make acquisitions. Exceeding any of these restrictions would require the consent of our lenders. We may be unable to successfully integrate any assets, liabilities, customers, systems and management personnel we acquire into our operations and we may not be able to realize related revenue synergies and cost savings within expected time frames. Our failure to execute our acquisition strategy could have a material adverse effect on our business. We cannot assure you that our acquisition strategy will be successful or that we will be able to successfully integrate acquisitions we do make.

Any acquisitions that we complete may dilute stockholder ownership interests in EnerSys, may have adverse effects on our financial condition and results of operations and may cause unanticipated liabilities.

Future acquisitions may involve the issuance of our equity securities as payment, in part or in full, for the businesses or assets acquired. Any future issuances of equity securities would dilute stockholder ownership interests. In addition, future acquisitions might not increase, and may even decrease our earnings or earnings per share and the benefits derived by us from an acquisition might not outweigh or might not exceed the dilutive effect of the acquisition. We also may incur additional debt or suffer adverse tax and accounting consequences in connection with any future acquisitions.

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The failure or security breach of critical computer systems could seriously affect our sales and operations.

We operate a number of critical computer systems throughout our business that can fail for a variety of reasons. If such a failure were to occur, we may not be able to sufficiently recover from the failure in time to avoid the loss of data or any adverse impact on certain of our operations that are dependent on such systems. This could result in lost sales and the inefficient operation of our facilities for the duration of such a failure.

We operate a number of critical computer systems throughout our business for the exchange of information both within the company and in communicating with third parties. Despite our efforts to protect the integrity of our systems and network as well as sensitive, confidential or personal data or information, our facilities and systems and those of our third-party service providers may be vulnerable to security breaches, theft, misplaced or lost data, programming and/or human errors that could potentially lead to the compromising of sensitive, confidential or personal data or information, improper use of our systems, software solutions or networks, unauthorized access, use, disclosure, modification or destruction of information, defective products, production downtimes and operational disruptions, which in turn could adversely affect our reputation, competitiveness, and results of operations.

Our ability to maintain adequate credit facilities.

Our ability to continue our ongoing business operations and fund future growth depends on our ability to maintain adequate credit facilities and to comply with the financial and other covenants in such credit facilities or to secure alternative sources of financing. However, such credit facilities or alternate financing may not be available or, if available, may not be on terms favorable to us.

Our indebtedness could adversely affect our financial condition and results of operations.

As of March 31, 2012, we had $256.1 million of total consolidated debt (including capital lease obligations). This level of debt could:

• increase our vulnerability to adverse general economic and industry conditions, including interest rate fluctuations, because a portion of our borrowings bear, and will continue to bear, interest at floating rates;

• require us to dedicate a substantial portion of our cash flow from operations to debt service payments, which would reduce the availability of our cash to fund working capital, capital expenditures or other general corporate purposes, including acquisitions;

• limit our flexibility in planning for, or reacting to, changes in our business and industry;

• restrict our ability to introduce new products or new technologies or exploit business opportunities;

• place us at a disadvantage compared with competitors that have proportionately less debt;

• limit our ability to borrow additional funds in the future, if we need them, due to financial and restrictive covenants in our debt agreements;

• have a material adverse effect on us if we fail to comply with the financial and restrictive covenants in our debt agreements; and

• dilute share ownership percentage if the Company’s share price is higher than the Convertible Notes’ conversion price of $40.60 per share.

ITEM 1B. UNRESOLVED STAFF COMMENTS

None.

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ITEM 2. PROPERTIES

The Company’s worldwide headquarters is located in Reading, Pennsylvania. Geographic headquarters for our Americas, Europe and Asia segments are located in Reading, Pennsylvania, Zurich, Switzerland and Singapore, respectively. The Company owns approximately 80% of its manufacturing facilities and distribution centers worldwide. The following sets forth the Company’s principal owned or leased facilities by business segment:

Americas: Colorado, Kansas, Kentucky, Missouri, Ohio, Pennsylvania, South Carolina and Tennessee in the United States, Monterrey and Tijuana in Mexico, Argentina and Brazil in South America.

Europe: Bulgaria, Czech Republic, France, Germany, Poland, UK, South Africa and Tunisia.

Asia: Jiangdu, Shantou and Shuangqiao in China and Andhra Pradesh in India.

We consider our plants and facilities, whether owned or leased, to be in satisfactory condition and adequate to meet the needs of our current businesses and projected growth. Information as to material lease commitments is included in Note 9, “Leases,” to the consolidated financial statements appearing in this Annual Report on Form 10-K.

ITEM 3. LEGAL PROCEEDINGS

From time to time, we are involved in litigation incidental to the conduct of our business. We do not expect that any of this litigation, individually or in the aggregate, will have a material adverse effect on our financial condition, results of operations or cash flow.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

PART II

ITEM 5. MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

Market Information

The Company’s common stock has been listed on the New York Stock Exchange under the symbol “ENS” since it began trading on July 30, 2004. Prior to that time, there had been no public market for our common stock. The following table sets forth, on a per share basis for the periods presented, the range of high, low and closing prices of the Company’s common stock.

Quarter Ended	High Price		Low Price		Closing Price
March 31, 2012	$	36.15	$	25.93	$	34.65
January 1, 2012		27.25		17.50		25.97
October 2, 2011		36.48		17.35		20.02
July 3, 2011		40.32		30.95		35.21
March 31, 2011	$	39.90	$	31.33	$	39.75
January 2, 2011		33.52		24.44		32.12
October 3, 2010		25.50		20.93		25.08
July 4, 2010		27.23		20.74		21.32

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Holders of Record

As of May 21, 2012, there were approximately 344 record holders of common stock of the Company. Because many of these shares are held by brokers and other institutions on behalf of stockholders, the Company is unable to estimate the total number of stockholders represented by these record holders.

Dividends

We have never paid or declared any cash dividends on our common stock, and we have certain restrictions from doing so pursuant to our credit agreements. We currently intend to retain any earnings for future growth and, therefore, do not expect to pay any cash dividends in the foreseeable future.

Recent Sales of Unregistered Securities

During the three fiscal years ended March 31, 2012, we did not issue any unregistered securities.

Purchases of Equity Securities by the Issuer and Affiliated Purchasers

The table below sets forth information regarding the Company’s purchases of its common stock during its fourth quarter ended March 31, 2012:

Purchases of Equity Securities

Period	(a) Total number of shares (or units) purchased			(b) Average price paid  per share (or unit)		(c) Total number of shares (or units) purchased as part of publicly announced plans or programs		(d) Maximum number (or approximate dollar value) of shares (or units) that may be purchased under the plans or programs(2)
January 2, 2012- January 29, 2012		—		$	—		—		80,692
January 30, 2012-Febuary 26, 2012		10,530	(1)		34.24		—		137,475
February 27, 2012-March 31, 2012		5,807	(1)		34.80		—		151,562
Total		16,337		$	34.44		—

(1) These amounts represent the number of shares of common stock we purchased from participants in our equity incentive plans. As provided by our equity incentive plans, vested options outstanding may be exercised through surrender to the Company of option shares or vested options outstanding under the respective plans to satisfy the applicable aggregate exercise price (and any withholding tax) required to be paid upon such exercise.

(2) On May 26, 2011, the Company’s Board of Directors authorized the Company to repurchase up to the number of shares exercised through previous stock option awards and common stock issued under the 2010 Equity Incentive Plan.

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STOCK PERFORMANCE GRAPH

The following graph compares the changes in cumulative total returns on EnerSys’ common stock with the changes in cumulative total returns of the New York Stock Exchange Composite Index, a broad equity market index, and the total return on a selected peer group index. The peer group selected is based on the standard industrial classification codes (“SIC Codes”) established by the U.S. government. The index chosen was “Miscellaneous Electrical Equipment and Suppliers” and comprises all publically traded companies having the same three-digit SIC Code (369) as EnerSys.

The graph was prepared assuming that $100 was invested in EnerSys’ common stock, the New York Stock Exchange Composite Index and the peer group (duly updated for changes) on March 31, 2007.

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ITEM 6. SELECTED FINANCIAL DATA

	Fiscal Year Ended March 31,
	2012			2011		2010			2009			2008
	(In thousands, except per share data)
Consolidated Statements of Income:
Net sales	$	2,283,369		$	1,964,462	$	1,579,385		$	1,972,867		$	2,026,640
Cost of goods sold		1,770,664			1,514,618		1,218,481			1,559,433			1,644,753
Gross profit		512,705			449,844		360,904			413,434			381,887
Operating expenses		297,806			259,217		235,597			256,507			249,350
Legal proceedings (settlement income) charge		(900	)		—		—			3,366			—
Restructuring charges		4,988			6,813		13,929			22,424			13,191
Bargain purchase gain		—			—		(2,919	)		—			—
Gain on sale of facilities		—			—		—			(11,308	)		—
Operating earnings		210,811			183,814		114,297			142,445			119,346
Interest expense		16,484			22,038		22,658			26,733			28,917
Charges related to refinancing		—			8,155		—			5,209			—
Other (income) expense, net		3,068			2,177		4,384			(8,597	)		4,234
Earnings before income taxes		191,259			151,444		87,255			119,100			86,195
Income tax expense		47,292			38,018		24,951			37,170			26,499
Net earnings		143,967			113,426		62,304			81,930			59,696
Net losses attributable to noncontrolling interests		(36	)		—		—			—			—
Net earnings attributable to EnerSys stockholders	$	144,003		$	113,426	$	62,304		$	81,930		$	59,696
Net earnings per share attributable to EnerSys stockholders:
Basic	$	2.95		$	2.30	$	1.29		$	1.68		$	1.25
Diluted		2.93			2.27		1.28			1.66			1.22
Weighted average shares of common stock outstanding:
Basic		48,748,205			49,376,132		48,122,207			48,824,434			47,645,225
Diluted		49,216,035			50,044,246		48,834,095			49,420,303			48,644,450

	Fiscal Year Ended March 31,
	2012			2011			2010			2009			2008
	(In thousands)
Consolidated cash flow data:
Net cash provided by operating activities	$	204,196		$	76,459		$	136,602		$	219,437		$	4,018
Net cash used in investing activities		(73,420	)		(91,661	)		(77,244	)		(46,810	)		(62,150	)
Net cash (used in) provided by financing activities		(78,382	)		(82,677	)		(24,472	)		(23,196	)		39,558
Other operating data:
Capital expenditures		48,943			59,940			45,111			57,143			45,037

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	As of March 31,
	2012		2011		2010		2009		2008
	(In thousands)
Consolidated balance sheet data:
Cash and cash equivalents	$	160,490	$	108,869	$	201,042	$	163,161	$	20,620
Working capital		611,372		554,164		475,768		429,769		389,480
Total assets		1,919,279		1,828,387		1,652,010		1,492,851		1,710,790
Total debt, including capital leases		256,101		253,400		350,486		375,656		426,754
Total EnerSys stockholders’ equity		1,032,195		974,331		779,897		670,151		691,543

ITEM 7. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following discussion and analysis of our results of operations and financial condition for the fiscal years ended March 31, 2012, 2011, and 2010, should be read in conjunction with our audited consolidated financial statements and the notes to those statements included in Item 8, Financial Statements and Supplementary Data, of this Annual Report on Form 10-K. Our discussion contains forward-looking statements based upon current expectations that involve risks and uncertainties, such as our plans, objectives, opinions, expectations, anticipations and intentions and beliefs. Actual results and the timing of events could differ materially from those anticipated in those forward-looking statements as a result of a number of factors. See “Cautionary Note Regarding Forward-Looking Statements,” “Business” and “Risk Factors,” sections elsewhere in this Annual Report on Form 10-K. In the following discussion and analysis of results of operations and financial condition, certain financial measures may be considered “non-GAAP financial measures” under Securities and Exchange Commission rules. These rules require supplemental explanation and reconciliation, which is provided in this Annual Report on Form 10-K.

EnerSys’ management uses the non-GAAP measures, EBITDA and Adjusted EBITDA, in their computation of compliance with loan covenants. These measures, as used by EnerSys, adjust net earnings determined in accordance with GAAP for interest, taxes, depreciation and amortization, and certain charges or credits as permitted by our credit agreements, that were recorded during the periods presented.

EnerSys’ management uses the non-GAAP measures, Primary Working Capital and Primary Working Capital Percentage (see definition in “Overview” below) along with capital expenditures, in their evaluation of business segment cash flow and financial position performance.

These non-GAAP disclosures have limitations as analytical tools, should not be viewed as a substitute for cash flow or operating earnings determined in accordance with GAAP, and should not be considered in isolation or as a substitute for analysis of the Company’s results as reported under GAAP, nor are they necessarily comparable to non-GAAP performance measures that may be presented by other companies. This supplemental presentation should not be construed as an inference that the Company’s future results will be unaffected by similar adjustments to operating earnings determined in accordance with GAAP.

Overview

We are the global leader in stored energy solutions for industrial applications. We manufacture, market and distribute industrial batteries and related products such as chargers, power equipment and battery accessories, and we provide related after-market and customer-support services for industrial batteries. We market and sell our products globally to over 10,000 customers in more than 100 countries through a network of distributors, independent representatives and our internal sales force.

We operate and manage our business in three geographic regions of the world—Americas, Europe and Asia, as described below. Our business is highly decentralized with manufacturing locations throughout the world.

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More than half of our manufacturing capacity is located outside of the United States, and approximately 60% of our net sales are generated outside of the United States. The Company has three reportable business segments based on geographic regions, defined as follows:

• Americas, which includes North and South America, with our segment headquarters in Reading, Pennsylvania, USA,

• Europe, which includes Europe, the Middle East and Africa, with our segment headquarters in Zurich, Switzerland, and

• Asia, which includes Asia, Australia and Oceania, with our segment headquarters in Singapore.

See Note 23 to the Consolidated Financial Statements for segment related disclosures.

We evaluate business segment performance based primarily upon operating earnings, exclusive of highlighted items. Highlighted items are those that the Company deems are not indicative of ongoing operating results, including those charges that the Company incurs as a result of restructuring activities and those charges and credits that are not directly related to ongoing business segment performance. All corporate and centrally incurred costs are allocated to the business segments based principally on net sales. We evaluate business segment cash flow and financial position performance based primarily upon capital expenditures and Primary Working Capital levels (see definition of Primary Working Capital in “Liquidity and Capital Resources” below).

Our management structure, financial reporting systems, and associated internal controls and procedures, are all consistent with our three geographic business segments. We report on a March 31 fiscal year-end. Our financial results are largely driven by the following factors:

• global economic conditions and general cyclical patterns of the industries in which our customers operate;

• changes in our selling prices and, in periods when our product costs increase, our ability to raise our selling prices to pass such cost increases through to our customers;

• the extent to which we are able to efficiently utilize our global manufacturing facilities and optimize our capacity;

• the extent to which we can control our fixed and variable costs, including those for our raw materials, manufacturing, distribution and operating activities;

• changes in our level of debt and changes in the variable interest rates under our credit facilities; and

• the size and number of acquisitions and our ability to achieve their intended benefits.

We have two primary industrial battery product lines: reserve power products and motive power products. Net sales classifications by product line are as follows:

• Reserve power products are used for backup power for the continuous operation of critical applications in telecommunications systems, UPS applications for computer and computer-controlled systems, and other specialty power applications, including security systems, premium starting, lighting and ignition applications, in switchgear, electrical control systems used in electric utilities and energy pipelines, in commercial aircraft, satellites, military aircraft, submarines, ships, tactical vehicles and portable energy packs.

• Motive power products are used to provide power for manufacturing, warehousing and other material handling equipment, primarily electric industrial forklift trucks, mining equipment, diesel locomotive starting and other rail equipment.

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Current Market Conditions

Economic Climate

Recent indicators suggest a mixed trend in economic activity among our different geographical regions. The Americas region continues its economic recovery which has been in place since fiscal 2010. Asia’s economic expansion continues but at a slower rate. The sovereign debt crisis in Europe is a factor in slowing overall economic growth in this region and leading to declining economic growth in many of the Western European countries. Overall, on a consolidated basis, we have experienced positive trends in our quarterly revenue and order rate.

We believe we are well positioned to take advantage of future growth in our markets. We have taken numerous steps to restructure our manufacturing base and administrative operations to reduce our costs. We expect the economic climate and our strong capital structure will be conducive to a continuation of acquisitions which will help grow our business faster than the overall market growth.

Volatility of Commodities and Foreign Currencies

Our most significant commodity and foreign currency exposures are related to lead and the euro. Volatility of commodity costs and foreign currency exchange rates have caused large swings in our production costs. As the global economic climate changes, we anticipate that our commodity costs may continue to fluctuate significantly as they have in the past several years. The increase in our cost of lead due to increases in average lead prices was approximately $59 million in fiscal 2012 compared to fiscal 2011.

Customer Pricing

Our selling prices fluctuated during the last several years to offset the volatile cost of commodities. Beginning in the third quarter of fiscal 2009, as a result of reductions in the cost of lead, our average selling prices began to decline on a sequential quarterly basis. As the cycle of lead costs turned upward in early fiscal 2010, we began to increase average selling prices to help offset the higher costs. During fiscal 2011 and 2012, our selling prices increased to reflect the rising commodity prices. Selling price increases offset approximately $49 million of the increased commodity costs of $72 million in fiscal 2012. Approximately 35% to 40% of our revenue is currently subject to agreements that adjust pricing to a market-based index for lead.

Liquidity and Capital Resources

Current market conditions related to our liquidity and capital resources are favorable. In March 2011, we refinanced our 2008 senior secured credit facility, comprising a $225 million Term A Loan and a $125 million revolving credit line (collectively the “2008 Credit Facility”), gaining additional flexibility in terms and an extended maturity to March 2016. We believe current conditions remain favorable for the Company to have continued positive cash flow from operations that, along with available cash and cash equivalents and our undrawn lines of credit, will be sufficient to fund our capital expenditures, acquisitions and other investments for growth.

Our cash flows from operating activities were $204 million and $76 million during fiscal 2012 and 2011, respectively. We invested $49 million and $60 million in capital expenditures, and $25 million and $32 million in new business opportunities in fiscal 2012 and 2011, respectively.

As a result of the above actions, at March 31, 2012, our financial position is strong and we have substantial liquidity with $160 million of available cash and cash equivalents, $282 million of undrawn, committed credit lines, and over $95 million of uncommitted credit lines. We believe we have the financial resources and the capital available to remain active in pursuing further investment and acquisition opportunities.

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Cost Savings Initiatives-Restructuring

Cost savings programs remain a continuous element of our business strategy and are directed primarily at further reductions in plant manufacturing (labor and overhead), raw materials costs and our operating expenses (primarily selling, general and administrative). Numerous individual cost savings opportunities are identified and evaluated by management with a formal selection and approval process that results in an ongoing list of cost savings projects to be implemented. In order to realize cost savings benefits for a majority of these initiatives, costs are incurred either in the form of capital expenditures, funding the cash obligations of previously recorded restructuring expenses or current period expenses.

During fiscal 2009 and fiscal 2010, we announced a plan to restructure certain of our European and American operations, which resulted in the reduction of approximately 470 employees on completion of the plan. These actions were primarily in Europe, the most significant of which was the closure of our leased Italian manufacturing facility and the opening of a new Italian distribution center to continue to provide responsive service to our customers in that market. Total charges for these actions amounted to approximately $32 million, which includes cash expenses of approximately $23 million, primarily for employee severance-related payments, and a non-cash charge of approximately $9 million, primarily for impairment of fixed assets. Based on the applicable accounting guidance, we recorded restructuring charges of $19.1 million in fiscal 2009, $12.4 million in fiscal 2010 and $0.4 million in fiscal 2011. As of March 31, 2012 this plan has been completed. Our fiscal 2012 operating results reflect virtually all of the estimated $24 million of favorable annualized pre-tax earnings impact related to those actions.

In fiscal 2010, we began the restructuring programs primarily related to the Oerlikon acquisition in Europe and completed the restructuring as of March 31, 2012.

During fiscal 2011, we began further restructuring programs related to our European operations, including distribution, which upon completion is expected to result in the reduction of approximately 60 employees. Our fiscal 2012 operating results reflect approximately half of the estimated $4 million of favorable annualized pre-tax earnings impact of these programs, with the remainder expected to be experienced in future periods.

In addition, during fiscal 2012 the we announced restructuring programs related to our operations in Europe, primarily consisting of the transfer of manufacturing of select products between certain of our manufacturing operations and restructuring of our selling, general and administrative operations. These actions are expected to result in the reduction of approximately 80 employees upon completion. Our fiscal 2012 operating results reflect approximately $1 million of the estimated $5 million of favorable annualized pre-tax earnings impact of the fiscal 2012 programs

The Company expects to be committed to approximately a total of $1 million of expenses for the remaining fiscal 2011 and 2012 restructuring programs in fiscal 2013.

Critical Accounting Policies and Estimates

Our significant accounting policies are described in Notes to Consolidated Financial Statements in Item 8. In preparing our financial statements, management is required to make estimates and assumptions that, among other things, affect the reported amounts of assets, liabilities, sales and expense. These estimates and assumptions are most significant where they involve levels of subjectivity and judgment necessary to account for highly uncertain matters or matters susceptible to change, and where they can have a material impact on our financial condition and operating performance. We discuss below the more significant estimates and related assumptions used in the preparation of our consolidated financial statements. If actual results were to differ materially from the estimates made, the reported results could be materially affected.

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Revenue Recognition

We recognize revenue when the earnings process is complete. This occurs when risk and title transfers, collectability is reasonably assured and pricing is fixed and determinable. Shipment terms to our battery product customers are either shipping point or destination and do not differ significantly between our business segments of the world. Accordingly, revenue is recognized when risk and title is transferred to the customer. Amounts invoiced to customers for shipping and handling are classified as revenue. Taxes on revenue producing transactions are not included in net sales.

We recognize revenue from the service of reserve power and motive power products when the respective services are performed.

Management believes that the accounting estimates related to revenue recognition are critical accounting estimates because they require reasonable assurance of collection of revenue proceeds and completion of all performance obligations. Also, revenues are recorded net of provisions for sales discounts and returns, which are established at the time of sale. These estimates are based on our past experience.

Asset Impairment Determinations

We test for the impairment of our goodwill and indefinite lived trade names at least annually and whenever events or circumstances occur indicating that a possible impairment has been incurred. We utilize financial projections of our business segments, certain cash flow measures, as well as our market capitalization in the determination of the fair value of these assets.

With respect to our other long-lived assets other than goodwill and indefinite lived trade names, we test for impairment when indicators of impairment are present. An asset is considered impaired when the undiscounted estimated net cash flows expected to be generated by the asset are less than its carrying amount. The impairment recognized is the amount by which the carrying amount exceeds the fair value of the impaired asset.

In making future cash flow analyses of goodwill and other long-lived assets, we make assumptions relating to the following:

• The intended use of assets and the expected future cash flows resulting directly from such use;

• Industry specific economic conditions;

• Competitor activities and regulatory initiatives; and

• Client and customer preferences and patterns.

We believe that an accounting estimate relating to asset impairment is a critical accounting estimate because the assumptions underlying future cash flow estimates are subject to change from time to time and the recognition of an impairment could have a significant impact on our financial statements.

Litigation and Claims

From time to time the Company has been or may be a party to various legal actions and investigations including, among others, employment matters, compliance with government regulations, federal and state employment laws, including wage and hour laws, contractual disputes and other matters, including matters arising in the ordinary course of business. These claims may be brought by, among others, governments, customers, suppliers and employees. Management considers the measurement of litigation reserves as a critical accounting estimate because of the significant uncertainty in some cases relating to the outcome of potential claims or litigation and the difficulty of predicting the likelihood and range of potential liability involved, coupled with the material impact on our results of operations that could result from litigation or other claims. In determining legal reserves, management considers, among other issues:

• Interpretation of contractual rights and obligations;

• The status of government regulatory initiatives, interpretations and investigations;

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• The status of settlement negotiations;

• Prior experience with similar types of claims;

• Whether there is available insurance coverage; and

• Advice of outside counsel.

Environmental Loss Contingencies

Accruals for environmental loss contingencies (i.e., environmental reserves) are recorded when it is probable that a liability has been incurred and the amount can reasonably be estimated. Management views the measurement of environmental reserves as a critical accounting estimate because of the considerable uncertainty surrounding estimation, including the need to forecast well into the future. From time to time we may be involved in legal proceedings under federal, state and local, as well as international environmental laws in connection with our operations and companies that we have acquired. The estimation of environmental reserves is based on the evaluation of currently available information, prior experience in the remediation of contaminated sites and assumptions with respect to government regulations and enforcement activity, changes in remediation technology and practices, and financial obligations and credit worthiness of other responsible parties and insurers.

Warranty

We record a warranty reserve for possible claims against our product warranties, which generally run for a period ranging from one to twenty years for our reserve power batteries and for a period ranging from one to seven years for our motive power batteries. The assessment of the adequacy of the reserve includes a review of open claims and historical experience.

Management believes that the accounting estimate related to the warranty reserve is a critical accounting estimate because the underlying assumptions used for the reserve can change from time to time and warranty claims could potentially have a material impact on our results of operations.

Allowance for Doubtful Accounts

We encounter risks associated with sales and the collection of the associated accounts receivable. We record a provision for accounts receivable that are considered to be uncollectible. In order to calculate the appropriate provision, management analyzes the creditworthiness of specific customers and the aging of customer balances. Management also considers general and specific industry economic conditions, industry concentration and contractual rights and obligations.

Management believes that the accounting estimate related to the allowance for doubtful accounts is a critical accounting estimate because the underlying assumptions used for the allowance can change from time to time and uncollectible accounts could potentially have a material impact on our results of operations.

Retirement Plans

We use certain assumptions in the calculation of the actuarial valuation of our defined benefit plans. These assumptions include the discount rate, expected long-term rates of return on assets and rates of increase in compensation levels. Changes in these assumptions can result in changes to the recognized pension expense and recorded liabilities.

We account for our defined benefit pension plans in accordance with the Financial Accounting Standards Board (“FASB”) guidance. The guidance requires an entity to recognize in its statement of financial position an asset for a defined benefit postretirement plan’s overfunded status or a liability for a plan’s underfunded status,

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measure a defined benefit postretirement plan’s assets and obligation that determine its funded status as of the end of the employer’s fiscal year, and recognize changes in the funded status of a defined benefit postretirement plan in comprehensive income in the year in which the change occurs.

Critical accounting estimates and assumptions related to the actuarial valuation of our defined benefit plans are evaluated periodically as conditions warrant and changes to such estimates are recorded.

Equity-Based Compensation

We recognize compensation cost relating to equity-based payment transactions by using a fair-value measurement method, in accordance with FASB guidance on accounting for share-based payment. FASB guidance requires all equity-based payments to employees, including grants of restricted stock units, stock options and market share units, to be recognized as compensation expense based on fair value at grant date over the requisite service period of the awards. We determine the fair value of restricted stock units based on the quoted market price of our common stock on the date of grant. The fair value of stock options is determined using the Black-Scholes option-pricing model, which uses both historical and current market data to estimate the fair value. The fair value of market share units is estimated at the date of grant using a binomial lattice model. Both models incorporate various assumptions such as the risk-free interest rate, expected volatility, expected dividend yield and expected life of the awards. When estimating the requisite service period of the awards, we consider many related factors including types of awards, employee class, and historical experience. Actual results, and future changes in estimates of the requisite service period may differ substantially from our current estimates.

Income Taxes

Our effective tax rate is based on pretax income, statutory tax rates and tax planning opportunities available in the various jurisdictions in which we operate. We account for income taxes in accordance with FASB guidance on accounting for income taxes, which requires that deferred tax assets and liabilities be recognized using enacted tax rates for the effect of temporary differences between book and tax bases on recorded assets and liabilities. FASB guidance also requires that deferred tax assets be reduced by a valuation allowance, when it is more likely than not that a tax benefit will not be realized.

The recognition and measurement of a tax position is based on management’s best judgment given the facts, circumstances and information available at the reporting date. In accordance with FASB guidance on accounting for uncertainty in income taxes, we evaluate tax positions to determine whether the benefits of tax positions are more likely than not of being sustained upon audit based on the technical merits of the tax position. For tax positions that are more likely than not of being sustained upon audit, we recognize the largest amount of the benefit that is greater than 50% likely of being realized upon ultimate settlement in the financial statements. For tax positions that are not more likely than not of being sustained upon audit, we do not recognize any portion of the benefit in the financial statements. If the more likely than not threshold is not met in the period for which a tax position is taken, we may subsequently recognize the benefit of that tax position if the tax matter is effectively settled, the statute of limitations expires, or if the more likely than not threshold is met in a subsequent period.

We evaluate, on a quarterly basis, our ability to realize deferred tax assets by assessing our valuation allowance and by adjusting the amount of such allowance, if necessary. The factors used to assess the likelihood of realization are our forecast of future taxable income and available tax planning strategies that could be implemented to realize the net deferred tax assets.

To the extent we prevail in matters for which reserves have been established, or are required to pay amounts in excess of our reserves, our effective tax rate in a given financial statement period could be materially affected. An unfavorable tax settlement would require use of cash and result in an increase in the effective tax rate in the year of resolution. A favorable tax settlement would be recognized as a reduction in our effective tax rate in the year of resolution.

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Results of Operations—Fiscal 2012 Compared to Fiscal 2011

The following table presents summary consolidated statement of income data for fiscal year ended March 31, 2012, compared to fiscal year ended March 31, 2011:

	Fiscal 2012						Fiscal 2011					Increase (Decrease)
	In Millions			As % Net Sales			In Millions		As % Net Sales			In     Millions			%
Net sales	$	2,283.4			100.0	%	$	1,964.4		100.0	%	$	319.0			16.2	%
Cost of goods sold		1,770.7			77.6			1,514.6		77.1			256.1			16.9
Gross profit		512.7			22.4			449.8		22.9			62.9			14.0
Operating expenses		297.8			13.0			259.2		13.2			38.6			14.9
Legal proceedings settlement income		(0.9	)		(0.1	)		—		—			(0.9	)		NM
Restructuring charges		5.0			0.2			6.8		0.4			(1.8	)		(26.8	)
Operating earnings		210.8			9.3			183.8		9.4			27.0			14.7
Interest expense		16.5			0.7			22.0		1.1			(5.5	)		(25.2	)
Other (income) expense, net		3.1			0.2			2.2		0.2			0.9			40.9
Charges related to refinancing		—			—			8.2		0.4			(8.2	)		NM
Earnings before income taxes		191.2			8.4			151.4		7.7			39.8			26.3
Income tax expense		47.3			2.1			38.0		1.9			9.3			24.4
Net earnings		143.9			6.3			113.4		5.8			30.5			26.9
Net losses attributable to noncontrolling interests		(0.1	)		—			—		—			(0.1	)		NM
Net earnings attributable to EnerSys Stockholders	$	144.0			6.3	%	$	113.4		5.8	%	$	30.6			27.0	%

NM = not meaningful

Overview

Our sales in fiscal 2012 were approximately $2.3 billion, a 16.2% increase from prior year sales primarily due to an improvement in organic volume and acquisitions of approximately 8% and 4%, respectively. Despite higher sales, the gross margin percentage in fiscal 2012 was down 50 basis points at 22.4% versus 22.9% in fiscal 2011, due mainly to higher commodity costs and unforeseen plant interruptions at two of our facilities.

Our financial position continues to be strong and we have substantial liquidity from our cash and cash equivalents, committed and uncommitted credit lines and our 2011 Credit Facility. Our positive cash flows and liquidity have enabled us to continue to invest in new business opportunities such as acquisitions in South Africa, South America, Germany and India and share repurchases.

A discussion of specific fiscal 2012 versus fiscal 2011 operating results follows, including an analysis and discussion of the results of our business segments.

Net Sales

Total net sales increased 16.2% or $319 million in fiscal 2012 from fiscal 2011. This was due to an 8% or $149 million increase in organic volume and price increases of 2% or $49 million. Acquisitions in fiscal 2012 added approximately 4% or $73 million to net sales. Fluctuations in the U.S. dollar versus foreign currencies increased sales by 2% or $48 million.

Fluctuations in foreign currencies had a positive impact on sales of fiscal 2012 versus fiscal 2011. The euro exchange rate to the U.S. dollar averaged $1.39 / € in fiscal 2012, compared to $1.33 / € in fiscal 2011 and $1.42 / € in fiscal 2010.

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Net sales by business segment were as follows:

	Fiscal 2012					Fiscal 2011					Increase (Decrease)
	In Millions		% Net Sales			In Millions		% Net Sales			In Millions		%
Europe	$	995.4		43.6	%	$	890.3		45.3	%	$	105.1		11.8	%
Americas		1,082.8		47.4			896.6		45.7			186.2		20.8
Asia		205.2		9.0			177.5		9.0			27.7		15.6
Total net sales	$	2,283.4		100.0	%	$	1,964.4		100.0	%	$	319.0		16.2	%

The Europe segment’s revenue increased by $105.1 million or 11.8% in fiscal 2012, as compared to fiscal 2011. Acquisitions and currency translation impact contributed approximately 5% and 4%, respectively, while increases in pricing contributed approximately 2%. Organic volume in Europe was flat.

The Americas segment’s revenue increased by $186.2 million or 20.8% in fiscal 2012, as compared to fiscal 2011, primarily due to higher organic volume, which contributed approximately a 15% increase. Price increases and acquisitions contributed approximately 3% each to the improvement.

The Asia segment’s revenue increased by $27.7 million or 15.6% in fiscal 2012 as compared to fiscal 2011. Higher organic volume and currency translation impact contributed approximately 8% and a 7%, respectively, while increases in pricing contributed approximately 1%.

Net sales by product line were as follows:

	Fiscal 2012					Fiscal 2011					Increase (Decrease)
	In Millions		As % Net Sales			In Millions		As % Net Sales			In Millions		%
Reserve power	$	1,092.7		47.9	%	$	970.4		49.4	%	$	122.3		12.6	%
Motive power		1,190.7		52.1			994.0		50.6			196.7		19.8
Total net sales	$	2,283.4		100.0	%	$	1,964.4		100.0	%	$	319.0		16.2	%

Sales in our reserve power product line increased in fiscal 2012 by $122.3 million or 12.6% compared to the prior year primarily due to acquisitions and higher organic volume which contributed approximately 5% and 4%, respectively. Currency translation impact and price increases contributed approximately 3% and 1%, respectively.

Sales in our motive power product line increased in fiscal 2012 by $196.7 million or 19.8% compared to the prior year primarily due to an increase in organic volume of approximately 11%. Price increases, acquisitions and currency translation impact contributed approximately 4%, 3% and 2%, respectively.

Gross Profit

	Fiscal 2012					Fiscal 2011					Increase (Decrease)
	In Millions		As % Net Sales			In Millions		As % Net Sales			In Millions		%
Gross profit	$	512.7		22.4	%	$	449.8		22.9	%	$	62.9		14.0	%

Gross profit increased $62.9 million or 14.0% in fiscal 2012 compared to fiscal 2011. Gross profit, excluding the effect of foreign currency translation, increased $55 million or 12.3% in fiscal 2012 compared to fiscal 2011. Lead costs represented approximately 34% of total cost of goods sold for fiscal 2012 as compared to

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approximately 33% of total cost of goods sold for fiscal 2011. We have made great efforts to sustain gross margin in an environment of rising commodity and energy costs, and continue to focus on a wide variety of sales initiatives, which include improving product mix to higher margin products and obtaining appropriate pricing for products relative to our costs. At the same time, we continue to focus on cost savings initiatives such as relocating production to low cost facilities and implementing more automation in our manufacturing plants.

Operating Items

	Fiscal 2012						Fiscal 2011					Increase (Decrease)
	In Millions			As % Net Sales			In Millions		As % Net Sales			In Millions			%
Operating expenses	$	297.8			13.0	%	$	259.2		13.2	%	$	38.6			14.9	%
Legal proceedings settlement income		(0.9	)		(0.1	)		—		—			(0.9	)		NM
Restructuring charges		5.0			0.2			6.8		0.4			(1.8	)		(26.8	)

NM = not meaningful

Operating Expenses

Operating expenses increased $38.6 million or 14.9% in fiscal 2012 from fiscal 2011. Operating expenses, excluding the effect of foreign currency translation, increased $29.4 million or 11.4% in fiscal 2012 compared to fiscal 2011. As a percentage of sales, operating expenses decreased from 13.2% in fiscal 2011 to 13.0% in fiscal 2012. The 20 basis point decrease was achieved by leveraging our operating expenses with higher sales.

Legal proceedings settlement income

In fiscal 2009, the Court of Commerce in Lyon, France ruled that the Company’s French subsidiary, EnerSys Sarl, which was acquired by the Company in 2002, was partially responsible for a 1999 fire in a French hotel under construction. The Company’s portion of damages was assessed at €2.7 million or $4.2 million, which was duly recorded and paid by the Company, but the ruling was appealed. In a subsequent ruling by the Court of Appeal of Lyon, France, the portion of damages was reduced, entitling the Company to a refund of the monies paid of €0.7 million or $0.9 million, which has been recorded and collected in the second quarter of fiscal 2012. The Company further appealed the ruling to the French Supreme Court, which on March 14, 2012, ruled in the Company’s favor and ordered the case back to the Court of Appeal of Lyon to further review certain aspects of the original decision in the case, including the assessment of damages.

Restructuring Charges

In fiscal 2012, we recorded $5.0 million of restructuring charges, primarily for staff reductions in Europe.

In fiscal 2011, we recorded $6.8 million of restructuring charges, of which $2.5 million related to the continuation of the restructuring program of our Oerlikon operations begun in fiscal 2010, and $4.3 million related primarily to new fiscal 2011 programs to further restructure our European operations, including distribution.

In fiscal 2010, we incurred $13.9 million of obligations for activities primarily related to the completion of the restructurings that began in fiscal 2008 and the restructuring program of the Oerlikon operations.

At March 31, 2012, the Oerlikon and fiscal 2009 European restructuring programs have been completed. The fiscal 2011 and 2012 restructuring programs are expected to incur additional restructuring charges of approximately $1 million in fiscal 2013.

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Operating Earnings

Fiscal 2012 operating earnings of $210.8 million were $27.0 million higher than in fiscal 2011 and was 9.3% of sales. Fiscal 2012 operating earnings were favorably affected by higher organic volume, our continuing cost savings programs and price increases, partially offset by higher commodity costs. Fiscal 2012 and 2011 operating earnings included $5.0 million and $6.8 million, respectively, of restructuring charges and $2.8 million and $2.5 million, respectively, for acquisition activity related expense in Europe, Americas and Asia.

Operating earnings by geographic segment were as follows:

	Fiscal 2012						Fiscal 2011					Increase (Decrease)
	In Millions			As % Net Sales(1)			In Millions		As % Net Sales(1)			In Millions			%
Europe	$	63.9			6.4	%	$	55.6		6.3	%	$	8.3			14.8	%
Americas		138.8			12.8			124.5		13.9			14.3			11.6
Asia		12.2			5.9			10.5		5.9			1.7			15.9
Subtotal		214.9			9.4			190.6		9.7			24.3			12.7
Legal proceedings settlement income-Europe		(0.9	)		(0.1	)		—		—			(0.9	)		NM
Restructuring charges-Europe		5.0			0.5			6.8		0.8			(1.8	)		(26.8	)
Total	$	210.8			9.3	%	$	183.8		9.4	%	$	27.0			14.7	%

(1) The percentages shown for the segments are computed as a percentage of the applicable segment’s net sales.

The Europe segment’s operating earnings, excluding the highlighted items discussed above, increased $8.3 million or 14.8% in fiscal 2012 compared to fiscal 2011. This improvement in operating earnings, despite a negative impact of approximately $2 million due to a three-week strike at our manufacturing plant in Poland in the second quarter of fiscal 2012 and start-up costs relating to our new business in Germany of approximately $1.3 million, is primarily attributable to pricing and the benefits of the restructuring programs on both production and operating expenses, partially offset by higher commodity costs.

The Americas segment’s operating earnings, excluding the highlighted items discussed above, increased $14.3 million or 11.6% in fiscal 2012, with the operating margin decreasing 110 basis points to 12.8%. This decline of operating margin in our Americas segment, despite a 15% increase in organic volumes, was due to increased commodity costs net of pricing and product mix.

Operating earnings in Asia increased 15.9% in fiscal 2012 in comparison to fiscal 2011, with the operating margin as a percentage of sales remaining flat at 5.9%. The increase in our Asia segment earnings in fiscal 2012 was primarily attributable to volume increase and better product mix, offset partially by higher commodity costs. We incurred approximately $3.8 million of start-up costs related to our new facility in Chongqing, China in fiscal 2012. Start-up costs related to Chongqing were approximately $1.6 million in fiscal 2011. In addition, we incurred approximately $0.9 million in fiscal 2012, costs related to a temporary closure of our facility in Jiangsu Province, China, by government authorities for an environmental review, as were, to our knowledge, all lead processing facilities in that province. After completion of the review, the government authorities allowed the plant to reopen in November 2011 on a conditional basis with the understanding that the Company would work with the assistance of the government agencies, to relocate to a more preferable location.

Interest Expense

	Fiscal 2012					Fiscal 2011					Increase (Decrease)
	In Millions		As % Net Sales			In Millions		As % Net Sales			In Millions			%
Interest expense	$	16.5		0.7	%	$	22.0		1.1	%	$	(5.5	)		(25.2	)%

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Interest expense of $16.5 million in fiscal 2012 (net of interest income of $0.9 million) was $5.5 million lower than the $22.0 million in fiscal 2011 (net of interest income of $1.3 million). The decrease in interest expense in fiscal 2012 compared to fiscal 2011 is attributable primarily to $6.7 million of expense associated with outstanding interest rate hedging contracts in the prior fiscal year. In the current fiscal year, the swaps no longer qualified for hedge accounting and losses realized on the swaps amounting to $1.0 million were included in other (income) expense, net. Lower interest expense in fiscal 2012 was also due to lower average borrowings offset by higher interest expense in Asia and South America.

Our average debt outstanding (including the average amount of the Convertible Notes discount of $27.5 million) was $270.1 million in fiscal 2012, compared to our average debt outstanding (including the average amount of the Convertible Notes discount of $33.7 million) of $326.3 million, in fiscal 2011. Our average cash interest rate incurred in fiscal 2012 was 3.1% compared to 4.4% in fiscal 2011.

Included in interest expense is non-cash, accreted interest on the Convertible Notes of $6.4 million in fiscal 2012 and $5.9 million in fiscal 2011. Also included in interest expense are non-cash charges related to amortization of deferred financing fees of $1.3 million in fiscal 2012, compared to $1.9 million, in fiscal 2011.

Charges Related to Refinancing

	Fiscal 2012					Fiscal 2011					Increase (Decrease)
	In Millions		As % Net Sales			In Millions		As % Net Sales			In Millions			%
Charges related to refinancing	$	—		—	%	$	8.2		0.4	%	$	(8.2	)		NM

In fiscal 2011, we incurred charges in connection with the refinancing of our credit facility. These charges included $2.3 million in write offs of deferred financing fees and $5.9 million of unrealized losses on account of discontinuing hedge accounting for the interest rate swap agreements.

Other (Income) Expense, Net

	Fiscal 2012					Fiscal 2011					Increase (Decrease)
	In Millions		As % Net Sales			In Millions		As % Net Sales			In Millions		%
Other (income) expense, net	$	3.1		0.2	%	$	2.2		0.2	%	$	0.9		40.9	%

Other (income) expense, net was expense of $3.1 million in fiscal 2012 compared to expense of $2.2 million in fiscal 2011. This $0.9 million unfavorable change is attributable to $1.5 million foreign currency losses in fiscal 2012 compared to $0.7 million foreign currency losses in the comparable prior year period and unrealized losses of $1.0 million on interest rate swaps as discussed above, offset by the $0.6 million for the secondary offering fees related to the shares sold by certain stockholders of the Company, including affiliates of Metalmark Capital LLC and certain other institutional stockholders in fiscal 2011.

Earnings Before Income Taxes

	Fiscal 2012					Fiscal 2011					Increase (Decrease)
	In Millions		As % Net Sales			In Millions		As % Net Sales			In Millions		%
Earnings before income taxes	$	191.2		8.4	%	$	151.4		7.7	%	$	39.8		26.3	%

As a result of the factors discussed above, fiscal 2012 earnings before income taxes were $191.2 million, an increase of $39.8 million or 26.3% compared to fiscal 2011.

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Income Tax Expense

	Fiscal 2012						Fiscal 2011						Increase (Decrease)
	In Millions			As % Net Sales			In Millions			As % Net Sales			In Millions		%
Income tax expense	$	47.3			2.1	%	$	38.0			1.9	%	$	9.3		24.4	%
Effective tax rate		24.7	%					25.1	%

The effective income tax rate was 24.7% in fiscal 2012, compared to the fiscal 2011 effective tax rate of 25.1%. The rate decrease in fiscal 2012 as compared to fiscal 2011 is primarily due to changes in the mix of earnings among tax jurisdictions.

Net Earnings

	Fiscal 2012					Fiscal 2011					Increase (Decrease)
	In Millions		As % Net Sales			In Millions		As % Net Sales			In Millions		%
Net earnings	$	144.0		6.3	%	$	113.4		5.8	%	$	30.6		27.0	%

As a result of the factors described above, fiscal 2012 net earnings were $144.0 million compared to fiscal 2011 net earnings of $113.4 million. The $30.6 million increase is due primarily to a $62.9 million or 14.0% increase in gross profit as a result of a $319.0 million or 16.2% increase in sales. Operating expenses increased $38.6 million or 14.9% due mainly to increased sales volume but reduced as a percentage of sales from 13.2% in fiscal 2011 to 13.0% in fiscal 2012. This decrease in the percentage is largely the result of leveraging our operating expenses with higher revenue.

Net earnings per common share in fiscal 2012 were $2.95 per basic share and $2.93 per diluted share compared to $2.30 per basic share and $2.27 per diluted share in fiscal 2011.

Results of Operations—Fiscal 2011 Compared to Fiscal 2010

The following table presents summary consolidated statement of income data for fiscal year ended March 31, 2011, compared to fiscal year ended March 31, 2010:

	Fiscal 2011					Fiscal 2010						Increase (Decrease)
	In Millions		As % Net Sales			In Millions			As % Net Sales			In Millions			%
Net sales	$	1,964.4		100.0	%	$	1,579.4			100.0	%	$	385.0			24.4	%
Cost of goods sold		1,514.6		77.1			1,218.5			77.1			296.1			24.3
Gross profit		449.8		22.9			360.9			22.9			88.9			24.6
Operating expenses		259.2		13.2			235.6			15.0			23.6			10.0
Restructuring charges		6.8		0.4			13.9			0.9			(7.1	)		(51.1	)
Bargain purchase gain		—		—			(2.9	)		(0.2	)		2.9			NM
Operating earnings		183.8		9.4			114.3			7.2			69.5			60.8
Interest expense		22.0		1.1			22.7			1.4			(0.7	)		(2.7	)
Charges related to refinancing		8.2		0.4			—			—			8.2			NM
Other (income) expense, net		2.2		0.2			4.3			0.3			(2.1	)		(50.3	)
Earnings before income taxes		151.4		7.7			87.3			5.5			64.1			73.6
Income tax expense		38.0		1.9			25.0			1.6			13.0			52.4
Net earnings	$	113.4		5.8	%	$	62.3			3.9	%	$	51.1			82.1	%

NM = not meaningful

33

Overview

Our sales in fiscal 2011 were approximately $2.0 billion, a 24.4% increase from prior year sales primarily due to an improvement in organic volume of approximately 18%. Despite higher commodity costs, we were able to maintain our gross margin percentage at the same level as fiscal 2010 at 22.9%.

Our financial position was strong and we had substantial liquidity from our cash and cash equivalents, uncommitted credit lines and our new 2011 Credit Facility. Our positive cash flows and liquidity enabled us to continue to invest in new business opportunities such as our new manufacturing plant in China and to make three acquisitions, including ABSL.

A discussion of specific fiscal 2011 versus fiscal 2010 operating results follows, including an analysis and discussion of the results of our business segments.

Net Sales

Total net sales increased 24.4% or $385 million in fiscal 2011 from fiscal 2010. This was due to an 18% or $288 million increase in organic volume and price increases of 4% or $66 million. Acquisitions in fiscal 2011 added approximately 4% or $56 million to net sales. Fluctuations in the U.S. dollar versus foreign currencies decreased sales by 2% or $25 million.

Fluctuations in foreign currencies had a negative impact on sales of fiscal 2011 versus fiscal 2010. The euro exchange rate to the U.S. dollar averaged $1.33 / € in fiscal 2011, but closed at $1.42 / € as of March 31, 2011 which was comparable to the full year averages of $1.42 / € in fiscal 2010 and $1.42 / € in fiscal 2009.

Net sales by business segment were as follows:

	Fiscal 2011					Fiscal 2010					Increase (Decrease)
	In     Millions		% Net Sales			In      Millions		% Net Sales			In      Millions		%
Europe	$	890.3		45.3	%	$	742.0		47.0	%	$	148.3		20.0	%
Americas		896.6		45.7			700.3		44.3			196.3		28.0
Asia		177.5		9.0			137.1		8.7			40.4		29.5
Total net sales	$	1,964.4		100.0	%	$	1,579.4		100.0	%	$	385.0		24.4	%

The Europe segment’s revenue increased by $148.3 million or 20.0% in fiscal 2011, as compared to fiscal 2010, primarily due to an increase in organic volume of approximately 16%. Price increases and acquisitions contributed approximately 6% and 3%, respectively, to the improvement which was partially offset by a 5% decrease due to weaker foreign currencies.

The Americas segment’s revenue increased by $196.3 million or 28.0% in fiscal 2011, as compared to fiscal 2010, primarily due to higher organic volume, which contributed approximately a 19% increase. Price increases and acquisitions contributed approximately 4% and 5% respectively, to the improvement.

The Asia segment’s revenue increased by $40.4 million or 29.5% in fiscal 2011 as compared to fiscal 2010, primarily due to higher organic volume of approximately 25% and a 6% increase due to foreign currency changes partially offset by a 2% decrease in pricing.

Net sales by product line were as follows:

	Fiscal 2011					Fiscal 2010					Increase (Decrease)
	In      Millions		As % Net Sales			In      Millions		As % Net Sales			In      Millions		%
Reserve power	$	970.4		49.4	%	$	820.5		52.0	%	$	149.9		18.3	%
Motive power		994.0		50.6			758.9		48.0			235.1		31.0
Total net sales	$	1,964.4		100.0	%	$	1,579.4		100.0	%	$	385.0		24.4	%

34

Sales in our reserve power product line increased in fiscal 2011 by $149.9 million or 18.3% compared to the prior year primarily due to higher organic volume which contributed approximately 16%. Price increases and acquisitions contributed approximately 2% each which was partially offset by a 2% decrease due to weaker foreign currencies.

Sales in our motive power product line increased in fiscal 2011 by $235.1 million or 31.0% compared to the prior year primarily due to an increase in organic volume of approximately 21%. Price increases and acquisitions contributed approximately 6% each which was partially offset by a 2% decrease due to weaker foreign currencies.

Gross Profit

	Fiscal 2011					Fiscal 2010					Increase (Decrease)
	In Millions		As % Net Sales			In Millions		As % Net Sales			In Millions		%
Gross profit	$	449.8		22.9	%	$	360.9		22.9	%	$	88.9		24.6	%

Gross profit increased $88.9 million or 24.6% in fiscal 2011 compared to fiscal 2010. Gross profit, excluding the effect of foreign currency translation, increased $91 million or 25.1% in fiscal 2011 compared to fiscal 2010. Lead costs represented approximately 33% of total cost of goods sold for fiscal 2011 as compared to approximately 26% of total cost of goods sold for fiscal 2010. We have made great efforts to sustain gross margin in an environment of rising commodity and energy costs, and continue to focus on a wide variety of sales initiatives, which included improving product mix to higher margin products and obtaining appropriate pricing for products relative to our costs. At the same time, we continued to focus on cost savings initiatives such as relocating production to low cost facilities and implementing more automation in our manufacturing plants.

Operating Expenses, Restructuring Charges and Bargain Purchase Gain

	Fiscal 2011					Fiscal 2010						Increase (Decrease)
	In Millions		As % Net Sales			In Millions			As % Net Sales			In Millions			%
Operating expenses	$	259.2		13.2	%	$	235.6			15.0	%	$	23.6			10.0	%
Restructuring charges		6.8		0.4			13.9			0.9			(7.1	)		(51.1	)
Bargain purchase gain		—		—			(2.9	)		(0.2	)		(2.9	)		NM

Operating Expenses

Operating expenses increased $23.6 million or 10.0% in fiscal 2011 from fiscal 2010 as net sales increased 24.4%, but reduced as a percentage of sales from 15.0% in fiscal 2010 to 13.2% in fiscal 2011. This decrease in the percentage was largely the result of leveraging our operating expenses with higher revenue.

Bargain Purchase Gain

In fiscal 2010, we acquired the industrial battery businesses of the Swiss company Accu Holding AG, which included the acquisition of the stock of OEB Traction Batteries and the operating assets and liabilities of Oerlikon Stationery Batteries and its Swedish sales subsidiary (all collectively referred to as “Oerlikon”). The accounting for the Oerlikon acquisition resulted in the recognition of a bargain purchase gain of $2.9 million. The Company commenced restructuring with the integration of Oerlikon into the Company’s operations in the fourth quarter of fiscal 2010. See “Restructuring Charges” below.

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Restructuring Charges

In fiscal 2011, we recorded $6.8 million of restructuring charges, of which $2.5 million related to the continuation of the restructuring program of our Oerlikon operations begun in fiscal 2010, and $4.3 million related primarily to new fiscal 2011 programs to further restructure our European operations, including distribution.

In fiscal 2010, we incurred $13.9 million of obligations for activities primarily related to the completion of the restructurings that began in fiscal 2008 and the restructuring program of the Oerlikon operations.

At March 31, 2011, our fiscal 2009 European restructuring programs were essentially complete; however, the Oerlikon and fiscal 2011 European restructuring programs were expected to incur additional restructuring charges of approximately $3 million, primarily in fiscal 2012.

Operating Earnings

Fiscal 2011 operating earnings of $183.8 million were $69.5 million higher than in fiscal 2010 and were 9.4% of sales. Fiscal 2011 operating earnings were favorably affected by higher organic volume, our continuing cost savings programs and price increases, partially offset by higher commodity costs. As discussed above, fiscal 2011 and 2010 operating earnings included the negative impact of $6.8 million and $13.9 million, respectively, of restructuring charges, offset in fiscal 2010, by a $2.9 million bargain purchase gain related to the Oerlikon acquisition. Although not highlighted below, fiscal 2011 and 2010 also included the negative impact of $2.5 million and $2.0 million, respectively, for acquisition activity related expense in Europe and Americas.

Operating earnings by geographic segment were as follows:

	Fiscal 2011					Fiscal 2010						Increase (Decrease)
	In Millions		As % Net Sales(1)			In Millions			As % Net Sales(1)			In Millions			%
Europe	$	55.6		6.3	%	$	17.6			2.4	%	$	38.0			215.3	%
Americas		124.5		13.9			87.2			12.4			37.3			42.9
Asia		10.5		5.9			20.5			15.0			(10.0	)		(48.9	)
Subtotal		190.6		9.7			125.3			7.9			65.3			52.1
Restructuring charges-Europe		6.8		0.8			13.2			1.8			(6.4	)		(48.4	)
Bargain purchase gain-Europe		—		—			(2.9	)		(0.4	)		2.9			NM
Restructuring charges-Americas		—		—			0.7			0.1			(0.7	)		NM
Total	$	183.8		9.4	%	$	114.3			7.2	%	$	69.5			60.8	%

(1) The percentages shown for the segments are computed as a percentage of the applicable segment’s net sales.

The Europe segment’s operating earnings, excluding the highlighted items discussed above, increased $38.0 million or 215.3% in fiscal 2011 compared to fiscal 2010 primarily due to the favorable impacts of higher organic volumes and selling prices, partially offset by higher commodity costs. Organic volume in Europe improved by 16% in fiscal 2011, a significant improvement when compared to fiscal 2010.

The Americas segment’s operating earnings, excluding the highlighted items discussed above, increased $37.3 million or 42.9% in fiscal 2011 primarily due to the favorable impacts of sales growth of 28% coupled with higher selling prices and improved plant utilization which were partially offset by higher commodity costs. Organic volume and pricing contributed approximately 19% and 4%, respectively, to this improvement and the favorable impact of acquisitions contributed a 5% increase. The Americas segment’s operating earnings were favorably affected by improved plant utilization.

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The Asia segment’s operating earnings decreased $10.0 million or 48.9% in fiscal 2011 when compared to fiscal 2010. Higher manufacturing costs, freight costs and expenses related to business development in the Asian region, coupled with the impact of lower pricing, contributed to the lower operating margins, partially offset by higher sales volume in Asia. The higher manufacturing costs were partially the result of expenses associated with the transition of our Shenzhen, China operations from a manufacturing and sales and distribution center, to a sales and distribution center. Business development expenses relate to initial start up costs as part of our efforts to establish a presence in India, as well as expansion in China with the construction of our new Chongqing manufacturing facility. In addition, fiscal 2010 benefited from a $1.1 million gain from the sale of assets.

Interest Expense

	Fiscal 2011					Fiscal 2010					Increase (Decrease)
	In Millions		As % Net Sales			In Millions		As % Net Sales			In Millions			%
Interest expense	$	22.0		1.1	%	$	22.7		1.4	%	$	(0.7	)		(2.7	)%

Interest expense of $22.0 million in fiscal 2011 (net of interest income of $1.3 million) was $0.7 million lower than the $22.7 million in fiscal 2010 (net of interest income of $1.8 million). The decrease in interest expense in fiscal 2011 compared to fiscal 2010 was attributed primarily to lower borrowing levels and the expiration of a portion of our interest rate swap agreements in the third and fourth quarters of fiscal 2011.

Our average debt outstanding (including the average amount of the Convertible Notes discount of $33.7 million) was $326.3 million in fiscal 2011, compared to our average debt outstanding (including the average amount of $39.4 million in Convertible Notes discount) of $364.1 million, in fiscal 2010. Our average cash interest rate incurred in fiscal 2011 was 4.4% compared to 4.3% in fiscal 2010.

Included in interest expense is non-cash, accreted interest on the Convertible Notes of $5.9 million in fiscal 2011 and $5.4 million in fiscal 2010. Also included in interest expense are non-cash charges related to amortization of deferred financing fees of $1.9 million in fiscal 2011, compared to $1.7 million, in fiscal 2010.

Charges Related to Refinancing

	Fiscal 2011					Fiscal 2010					Increase (Decrease)
	In Millions		As % Net Sales			In Millions		As % Net Sales			In Millions		%
Charges related to refinancing	$	8.2		0.4	%	$	—		—	%	$	8.2		NM

In fiscal 2011, we incurred charges in connection with the amounts borrowed under our 2011 Credit Facility. These charges included $2.3 million in write offs of deferred financing fees and $5.9 million of unrealized losses on account of discontinuing hedge accounting for the interest rate swap agreements.

Other (Income) Expense, Net

	Fiscal 2011					Fiscal 2010					Increase (Decrease)
	In Millions		As % Net Sales			In Millions		As % Net Sales			In Millions			%
Other (income) expense, net	$	2.2		0.2	%	$	4.3		0.3	%	$	(2.1	)		(50.3	)%

Other (income) expense, net was expense of $2.2 million in fiscal 2011 compared to expense of $4.3 million in fiscal 2010. This decrease was primarily due to lower foreign currency translation losses recorded in fiscal 2011 compared to fiscal 2010, offset by the $0.6 million for the secondary offering fees related to the shares sold by certain stockholders of the Company, including affiliates of Metalmark Capital LLC and certain other institutional stockholders in fiscal 2011.

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Earnings Before Income Taxes

	Fiscal 2011					Fiscal 2010					Increase (Decrease)
	In Millions		As % Net Sales			In Millions		As % Net Sales			In Millions		%
Earnings before income taxes	$	151.4		7.7	%	$	87.3		5.5	%	$	64.1		73.6	%

As a result of the factors discussed above, fiscal 2011 earnings before income taxes were $151.4 million, an increase of $64.1 million or 73.6% compared to fiscal 2010.

Income Tax Expense

	Fiscal 2011						Fiscal 2010						Increase (Decrease)
	In Millions			As % Net Sales			In Millions			As % Net Sales			In Millions		%
Income tax expense	$	38.0			1.9	%	$	25.0			1.6	%	$	13.0		52.4	%
Effective tax rate		25.1	%					28.6	%

The effective income tax rate was 25.1% in fiscal 2011, compared to the fiscal 2010 effective tax rate of 28.6%. The lower effective income tax rate in fiscal 2011 was primarily due to a change in the mix of earnings among tax jurisdictions and the favorable settlement of foreign tax audits of $3.1 million. The fiscal 2010 effective income tax rate included a non-recurring tax benefit of approximately $2.1 million on the filing of amended tax returns.

Net Earnings

	Fiscal 2011					Fiscal 2010					Increase (Decrease)
	In Millions		As % Net Sales			In Millions		As % Net Sales			In Millions		%
Net earnings	$	113.4		5.8	%	$	62.3		3.9	%	$	51.1		82.1	%

As a result of the factors described above, fiscal 2011 net earnings were $113.4 million compared to fiscal 2010 net earnings of $62.3 million. The $51.1 million increase was due primarily to an $88.9 million or 24.6% increase in gross profit as a result of a $385.0 million or 24.4% increase in sales. Operating expenses increased $23.6 million or 10.0% due mainly to increased sales volume but reduced as a percentage of sales from 15.0% in fiscal 2010 to 13.2% in fiscal 2011. This decrease in the percentage was largely the result of leveraging our operating expenses with higher revenue.

Net earnings per common share in fiscal 2011 were $2.30 per basic share and $2.27 per diluted share compared to $1.29 per basic share and $1.28 per diluted share in fiscal 2010.

Liquidity and Capital Resources

Overview

As we discussed in our Overview and Current Market Conditions above, our results have been significantly affected by the economic environment during the past three fiscal years. During periods of decreasing revenue, as during the recent recession, our Primary Working Capital generally decreases, enhancing cash flow from operations. In periods of increasing revenue, such as in fiscal 2012 and 2011, operating cash flow will generally be reduced by the need for additional Primary Working Capital. We have maintained sufficient lines of credit since the Company was formed in 2000 to fund our requirements for Primary Working Capital, capital expenditures, acquisitions and other investments. As discussed earlier, we believe that the 2011 Credit Facility which consists of a revolving line of credit of $350 million, expiring in March 2016, along with other credit lines of $138 million and our available cash and cash equivalents of $160.5 million as of March 31, 2012, will be sufficient for our needs and anticipated growth in the foreseeable future.

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Cash Flow and Financing Activities

Cash and cash equivalents at March 31, 2012, 2011 and 2010, were $160.5 million, $108.9 million and $201.0 million, respectively.

Cash provided by operating activities for fiscal 2012, 2011 and 2010, was $204.2 million, $76.5 million and $136.6 million, respectively.

During fiscal 2012, cash from operating activities was provided primarily from net earnings of $144.0 million, depreciation and amortization of $50.4 million and a net source of $14.5 million from non-cash interest expense, provision for doubtful accounts, deferred taxes, net losses and settlements on derivatives, stock compensation and gains on disposal of fixed assets. Change in current and other assets, accrued expenses, and other liabilities contributed a further $20.2 million, offset by a $24.9 million increase in Primary Working Capital.

During fiscal 2011, cash from operating activities was provided primarily from net earnings of $113.4 million, depreciation and amortization of $44.4 million and a net source of $17.6 million from non-cash interest expense, write-off of deferred finance fees, provision for doubtful accounts, deferred taxes and stock compensation. This cash flow was partially offset by an $86.7 million increase in Primary Working Capital and a $12.2 million net increase in current and other assets, accrued expenses, and other liabilities.

During fiscal 2010, cash from operating activities was provided primarily from net earnings of $62.3 million, depreciation and amortization of $44.9 million, a $28.4 million decrease in Primary Working Capital and a net source of $23.8 million from non-cash interest expense, provision for doubtful accounts, deferred taxes and stock compensation. This cash flow was partially offset by a $16.6 million decrease in accrued expenses and other liabilities, $2.9 million non-cash bargain purchase gain on the acquisition of Oerlikon, and a $0.9 million gain on disposal of assets.

As explained above in the discussion of our use of “non-GAAP financial measures,” we monitor the level and percentage of sales of Primary Working Capital. Primary Working Capital for this purpose is trade accounts receivable, plus inventories, minus trade accounts payable and the resulting net amount is divided by the trailing three month net sales (annualized) to derive a Primary Working Capital percentage. Primary Working Capital was $578.6 million (yielding a Primary Working Capital percentage of 24.4%) at March 31, 2012 and $547.3 million (yielding a Primary Working Capital percentage of 25.0%) at March 31, 2011. The 60 basis point decrease at March 31, 2012 versus March 31, 2011 was mainly a result of holding accounts receivables steady in spite of higher year-over-year organic sales and acquisitions. We had increased inventory levels in fiscal 2012 versus fiscal 2011 as we experienced an improvement in orders and sales, and as a result of our recent acquisitions. We closely monitor our inventory turns and continue to adjust production levels as necessary.

Primary Working Capital and Primary Working Capital percentages at March 31, 2012, 2011 and 2010 are computed as follows:

At March 31,	Trade Receivables		Inventory		Accounts Payable			Primary Working Capital		Quarter Revenue Annualized		Primary Working Capital %
			(in millions)
2012	$	466.8	$	361.8	$	(250.0	)	$	578.6	$	2,371.0		24.4	%
2011		464.1		335.0		(251.8	)		547.3		2,192.2		25.0
2010		383.6		254.4		(198.3	)		439.7		1,802.1		24.4

Cash used in investing activities for fiscal 2012, 2011 and 2010 was $73.4 million, $91.7 million and $77.2 million, respectively. Capital expenditures were $48.9 million, $59.9 million and $45.1 million in fiscal 2012, 2011 and 2010, respectively. The current year’s capital spending included the completion of our new plant in Chongqing, China and the capacity expansion of some of our existing manufacturing facilities. Our purchases of

39

and investments in businesses were $24.6 million, $32.2 million and $33.2 million in fiscal 2012, 2011 and 2010, respectively.

During fiscal 2012, we borrowed $111.6 million on our revolver and repaid $132.2 million. Borrowings financed a portion of our repurchases of common stock of $58.4 million and acquisitions of $24.6 million.

During fiscal 2011, we repaid $201.1 million of the 2008 Credit Facility and $11.1 million of the Euro Term Loan with $100 million of revolver proceeds borrowed under the new 2011 Credit Facility and available cash and cash equivalents. Additionally, in fiscal 2011 we borrowed $6.1 million under the China Term Loan, $3.1 million of short-term debt and paid $3.5 million in refinancing fees related to the 2011 Credit Facility.

During fiscal 2010, we repaid $7.4 million of short-term debt and made regularly scheduled payments of $25.2 million of long-term debt.

The exercise of stock options and the related tax benefits contributed $2.7 million, $24.0 million and $7.3 million, respectively, in fiscal 2012, 2011, and 2010.

As a result of the above, cash and cash equivalents increased $51.6 million from $108.9 million at March 31, 2011 to $160.5 million at March 31, 2012.

We currently are in compliance with all covenants and conditions under our credit agreements.

In addition to cash flows from operating activities, we had available committed and uncommitted credit lines of approximately $377 million at March 31, 2012 to cover short-term liquidity requirements. Our 2011 Credit Facility is committed through March 2016, as long as we continue to comply with the covenants and conditions of the credit facility agreement. Included in our available credit lines at March 31, 2012 is $269.4 million of our 2011 Credit Facility.

We believe that our cash flow from operations, available cash and cash equivalents and available borrowing capacity under our credit facility will be sufficient to meet our liquidity needs, including normal levels of capital expenditures, for the foreseeable future; however, there can be no assurance that this will be the case.

Off-Balance Sheet Arrangements

The Company did not have any off-balance sheet arrangements during any of the periods covered by this report.

Contractual Obligations and Commercial Commitments

At March 31, 2012, we had certain cash obligations, which are due as follows:

	Total		Less than 1 year		2 to 3 years		4 to 5 years		After 5 years
	(in millions)
Debt obligations	$	263.4	$	2.6	$	4.9	$	255.9	$	—
Interest on debt		26.1		8.3		15.8		2.0		—
Operating leases		57.4		18.3		23.5		12.0		3.6
Pension benefit payments and profit sharing		29.9		2.2		4.7		5.7		17.3
Restructuring		1.2		1.2		—		—		—
Facility construction commitments		8.6		8.6		—		—		—
Interest rate swap agreements		3.8		3.6		0.2		—		—
Lead contracts		0.9		0.9		—		—		—
Purchase commitments		9.8		9.8		—		—		—
Capital lease obligations, including interest		1.0		0.5		0.5		—		—
Total	$	402.1	$	56.0	$	49.6	$	275.6	$	20.9

40

Due to the uncertainty of future cash outflows, uncertain tax positions have been excluded from the table above.

Under our 2011 Credit Facility and other credit arrangements, we had outstanding standby letters of credit of $9.1 million as of March 31, 2012.

Credit Facilities and Leverage

Our focus on working capital management and cash flow from operations is measured by our ability to reduce debt and reduce our leverage ratios. Shown below are the leverage ratios at March 31, 2012 and 2011, in connection with our 2011 Credit Facility.

The total net debt as defined under our 2011 Credit Facility is $214.4 million for fiscal 2012 and is 0.8 times adjusted EBITDA (non-GAAP) as described below and reflects improved net earnings and positive cash flows

The following table provides a reconciliation of net earnings to EBITDA (non-GAAP) and adjusted EBITDA (non-GAAP) as per our credit agreements:

	Fiscal 2012			Fiscal 2011
	(in millions, except ratios)
Net earnings as reported	$	144.0		$	113.4
Add back:
Depreciation and amortization		50.4			44.4
Interest expense		16.5			22.0
Income tax expense		47.3			38.0
EBITDA (non GAAP)(1)	$	258.2		$	217.8
Adjustments per credit agreement definitions		11.6	(2)		11.4	(2)
Adjusted EBITDA (non-GAAP) per credit agreement	$	269.8		$	229.2
Total net debt(3)	$	214.4		$	219.8
Leverage ratios:
Total net debt/adjusted EBITDA ratio(4)		0.8 X			1.0 X
Maximum ratio permitted		3.25 X			3.25 X
Consolidated interest coverage ratio(5)		22.6 X			15.9 X
Minimum ratio required		4.5 X			4.5 X

(1) We have included EBITDA (non-GAAP) and adjusted EBITDA (non-GAAP) because our lenders use it as a key measure of our performance. EBITDA is defined as earnings before interest expense, income tax expense, depreciation and amortization. EBITDA is not a measure of financial performance under GAAP and should not be considered an alternative to net earnings or any other measure of performance under GAAP or to cash flows from operating, investing or financing activities as an indicator of cash flows or as a measure of liquidity. Our calculation of EBITDA may be different from the calculations used by other companies, and therefore comparability may be limited. Certain financial covenants in our 2011 Credit Facility are based on EBITDA, subject to adjustments, which are shown above. Because we have a significant amount of debt, and because continued availability of credit under our 2011 Credit Facility is critical to our ability to meet our business plans, we believe that an understanding of the key terms of our credit agreement is important to an investor’s understanding of our financial condition and liquidity risks. Failure to comply with our financial covenants, unless waived by our lenders, would mean we could not borrow any further amounts under our revolving credit facility and would give our lenders the right to demand immediate repayment of all outstanding revolving credit loans. We would be unable to continue our operations at current levels if we lost the liquidity provided under our credit agreements. Depreciation and amortization in this table excludes the amortization of deferred financing fees, which is included in interest expense.

(2) The $11.6 million adjustment to EBITDA in fiscal 2012 related primarily to the adjustment of non-cash stock compensation expense. The $11.4 million adjustment to EBITDA in fiscal 2011 related primarily to

41

the adjustment of $2.3 million for non-cash write off of deferred financing fees related to the March 2011 refinancing and $9.1 million related to non-cash stock compensation expense.

(3) Debt includes capital lease obligations and letters of credit and is net of U.S. cash and cash equivalents and a portion of European cash investments, as defined in the 2011 Credit Facility. In fiscal 2012, U.S. cash and cash equivalents and European cash investments were $5 million and $70 million, respectively, and in fiscal 2011, were $22 million and $44 million, respectively.

(4) These ratios are included to show compliance with the leverage ratios set forth in our credit facilities. We show both our current ratios and the maximum ratio permitted or minimum ratio required under our 2011 Credit Facilities.

(5) As defined in the 2011 Credit Facility, interest expense used in the consolidated interest coverage ratio excludes non cash interest of $8.0 million and includes $3.4 million of interest rate swap contract settlements for fiscal 2012. For fiscal 2011, interest expense used in the consolidated interest coverage ratio excludes non cash interest of $7.6 million.

EnerSys Stockholders’ Equity

EnerSys stockholders’ equity increased $57.9 million during fiscal 2012 due to net earnings of $144.0 million; $14.3 million of increases related to stock-based compensation and the exercise of stock options; decrease of $1.0 million due to acquisition of noncontrolling interest in a subsidiary, decrease due to repurchase of common shares of $58.4 million, currency translation adjustments of $32.3 million due primarily to the weakening of European currencies, $3.2 million unrealized loss on derivative instruments and $5.5 million related to pension liabilities.

EnerSys stockholders’ equity increased $194.4 million during fiscal 2011 due to net earnings of $113.4 million; an increase for currency translation adjustments of $36.5 million due primarily to the strengthening of European currencies, $33.0 million of increases related to stock-based compensation and the exercise of stock options and a $9.5 million unrealized gain on derivative instruments and $2.0 million related to pension liabilities.

RECENTLY ADOPTED ACCOUNTING PRONOUNCEMENTS

In June 2011, the FASB issued authoritative guidance requiring entities to present net income and other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements and eliminated the option to present components of other comprehensive income as part of the statement of shareholders’ equity. This guidance will be effective for us in the first quarter of fiscal 2013 and is not expected to have an impact on our financial statements other than the change in presentation.

In September 2011, the FASB issued revised guidance to simplify how entities test goodwill for impairment. The amendments will permit an entity to first assess qualitative factors to determine whether it is necessary to perform the two-step goodwill impairment test. An entity will no longer be required to calculate the fair value of a reporting unit unless the entity determines, based on a qualitative assessment that it is more likely than not that its fair value is less than its carrying amount. The amendments are effective for annual and interim goodwill impairment tests performed for fiscal years beginning after December 15, 2011, with early adoption permitted. We plan to adopt this guidance for its annual goodwill impairment test performed in fiscal 2013 and thereafter. The adoption will not have an impact on our financial statements.

Effective January 2, 2012, we prospectively adopted accounting guidance that was issued to clarify existing fair value measurement guidance as well as enhance fair value disclosures. The additional disclosures required by this guidance include quantitative information about significant unobservable inputs used for Level 3 measurements, qualitative information about the sensitivity of recurring Level 3 measurements, information about any transfers between Level 1 and 2 of the fair value hierarchy, information about when the current use of

42

a non-financial asset is different from the highest and best use, and the hierarchy classification for assets and liabilities whose fair value is disclosed only in the notes to the financial statements. The adoption of this standard did not have a material impact on our financial statements.

Related Party Transactions

FASB guidance, Related Party Disclosures requires us to identify and describe material transactions involving related persons or entities and to disclose information necessary to understand the effects of such transactions on our consolidated financial statements. In fiscal 2011, under the terms of a security holder agreement, we paid $0.6 million in fees related to secondary offerings of 2.85 million shares of our common stock to underwriters by certain of our stockholders, including affiliates of Metalmark Capital LLC and certain other institutional stockholders.

43

Sequential Quarterly Information

Fiscal 2012 and 2011quarterly operating results, and the associated quarterly trends within each of those two fiscal years, are affected by the same economic and business conditions as described in the fiscal 2012 versus fiscal 2011analyses previously discussed.

	Fiscal 2012										Fiscal 2011
	July 3, 2011 1st Qtr.		Oct. 2, 2011 2nd Qtr.			Jan. 1, 2012 3rd Qtr.		March 31, 2012 4th Qtr.			July 4, 2010 1st Qtr.		Oct. 3, 2010 2nd Qtr.		Jan. 2, 2011 3rd Qtr.			March 31, 2011 4th Qtr.
	(in millions, except per share amounts)
Net sales	$	569.2	$	547.2		$	574.2	$	592.8		$	435.0	$	472.8	$	508.6		$	548.0
Cost of goods sold		447.2		432.8			443.4		447.3			338.4		362.1		390.7			423.4
Gross profit		122.0		114.4			130.8		145.5			96.6		110.7		117.9			124.6
Operating expenses, including amortization		72.9		71.9			75.7		77.3			58.4		63.5		67.8			69.5
Legal proceedings settlement income		—		(0.9	)		—		—			—		—		—			—
Restructuring charges		0.4		0.9			1.4		2.3			0.7		2.7		1.8			1.6
Operating earnings		48.7		42.5			53.7		65.9			37.5		44.5		48.3			53.5
Interest expense		3.4		4.1			4.8		4.2			6.0		6.1		5.6			4.3
Charges related to refinancing		—		—			—		—			—		—		—			8.2
Other (income) expense, net		1.2		—			1.1		1.2			—		1.0		(0.4	)		1.6
Earnings before income taxes		44.1		38.4			47.8		60.5			31.5		37.4		43.1			39.4
Income tax expense		10.6		10.1			11.0		15.6			8.5		10.8		9.4			9.3
Net earnings		33.5		28.3			36.8		44.9			23.0		26.6		33.7			30.1
Net losses attributable to noncontrolling interests		—		—			—		(0.5	)		—		—		—			—
Net earnings attributable to EnerSys stockholders	$	33.5	$	28.3		$	36.8	$	45.4		$	23.0	$	26.6	$	33.7		$	30.1
Net earnings per common share attributable to EnerSys stockholders:
Basic	$	0.67	$	0.57		$	0.77	$	0.95		$	0.47	$	0.54	$	0.68		$	0.60
Diluted		0.66		0.57			0.77		0.94			0.47		0.53		0.67			0.59
Weighted average shares outstanding:
Basic		50,052,627		49,469,694			47,704,567		47,765,933			48,819,481		49,120,985		49,564,495			49,999,565
Diluted		50,668,276		49,806,964			48,045,900		48,343,000			49,442,915		49,746,602		50,331,554			50,655,912

Net Sales

Quarterly net sales by business segment were as follows:

	Fiscal 2012												Fiscal 2011
	1st Qtr.			2nd Qtr.			3rd Qtr.			4th Qtr.			1st Qtr.			2nd Qtr.			3rd Qtr.			4th Qtr.
	(in millions)
Net sales by segment:
Europe	$	253.0		$	245.3		$	247.6		$	249.5		$	188.5		$	207.4		$	236.4		$	258.0
Americas		259.2			252.3			281.2			290.1			205.7			221.1			224.6			245.2
Asia		57.0			49.6			45.4			53.2			40.8			44.3			47.6			44.8
Total	$	569.2		$	547.2		$	574.2		$	592.8		$	435.0		$	472.8		$	508.6		$	548.0
Segment net sales as % total:
Europe		44.4	%		44.8	%		43.1	%		42.1	%		43.3	%		43.9	%		46.5	%		47.1	%
Americas		45.6			46.1			49.0			48.9			47.3			46.8			44.2			44.7
Asia		10.0			9.1			7.9			9.0			9.4			9.3			9.3			8.2
Total		100.0	%		100.0	%		100.0	%		100.0	%		100.0	%		100.0	%		100.0	%		100.0	%

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Quarterly net sales by product line were as follows:

	Fiscal 2012												Fiscal 2011
	1st Qtr.			2nd Qtr.			3rd Qtr.			4th Qtr.			1st Qtr.			2nd Qtr.			3rd Qtr.			4th Qtr.
	(in millions)
Net sales by product line:
Reserve power	$	265.9		$	267.3		$	277.3		$	282.2		$	207.6		$	247.3		$	252.9		$	262.6
Motive power		303.3			279.9			296.9			310.6			227.4			225.5			255.7			285.4
Total	$	569.2		$	547.2		$	574.2		$	592.8		$	435.0		$	472.8		$	508.6		$	548.0
Product line net sales as % total:
Reserve power		46.7	%		48.9	%		48.3	%		47.6	%		47.7	%		52.3	%		49.7	%		47.9	%
Motive power		53.3			51.1			51.7			52.4			52.3			47.7			50.3			52.1
Total		100.0	%		100.0	%		100.0	%		100.0	%		100.0	%		100.0	%		100.0	%		100.0	%

ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Market Risks

Our cash flows and earnings are subject to fluctuations resulting from changes in interest rates, foreign currency exchange rates and raw material costs. We manage our exposure to these market risks through internally established policies and procedures and, when deemed appropriate, through the use of derivative financial instruments. Our policy does not allow speculation in derivative instruments for profit or execution of derivative instrument contracts for which there are no underlying exposures. We do not use financial instruments for trading purposes and are not a party to any leveraged derivatives. We monitor our underlying market risk exposures on an ongoing basis and believe that we can modify or adapt our hedging strategies as needed.

Counterparty Risks

We have entered into interest rate swap agreements to manage risk on a portion of our long-term floating-rate debt. We have entered into lead forward purchase contracts to manage risk on the cost of lead. We have entered into foreign exchange forward contracts and purchased option contracts to manage risk on foreign currency exposures. The Company’s agreements are with creditworthy financial institutions. Those contracts that result in a liability position at March 31, 2012 are $5.4 million (pre-tax), therefore the Company believes there is little risk of nonperformance by the counterparties. Those contracts that result in an asset position at March 31, 2012 are $1.5 million (pre-tax) and the vast majority of these will settle within one year.

Interest Rate Risks

We are exposed to changes in variable U.S. interest rates on borrowings under our credit agreements. On a selective basis, from time to time, we enter into interest rate swap agreements to reduce the negative impact that increases in interest rates could have on our outstanding variable rate debt. At the end of fiscal 2011, these interest rate swaps no longer qualified for hedge accounting due to the refinancing of the Company’s then existing credit facility. Changes in the fair value of these contracts for fiscal 2012 have therefore been recorded in the income statement in other (income) expense, net, while changes in fair value for the comparable period in fiscal 2011 were recorded in accumulated other comprehensive income.

At March 31, 2012 and 2011, the aggregate notional amount of interest rate swap agreements is $85.0 million. These agreements expire between February—May 2013.

Under the interest rate swaps, the Company receives three-month LIBOR and pays a fixed interest rate which averaged 4.28% on March 31, 2012 and 2011.

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A 100 basis point increase in interest rates would increase annual interest expense by approximately $0.8 million on the variable rate portions of our debt.

Commodity Cost Risks—Lead Contracts

We have a significant risk in our exposure to certain raw materials, which we estimate was over half of total cost of goods sold for fiscal 2012, 2011 and 2010. Our largest single raw material cost is for lead, for which the cost remains volatile. In order to hedge against increases in our lead cost, we have entered into contracts with financial institutions to fix the price of lead. A vast majority of such contracts are for a period not extending beyond one year. We had the following contracts outstanding at the dates shown below:

Date	$’s Under Contract		# Pounds Purchased		Average Cost/Pound		Approximate % of Lead Requirements(1)
	(in millions)		(in millions)
March 31, 2012	$	56.6		60.0	$	0.94		12	%
March 31, 2011		68.2		63.4		1.08		14
March 31, 2010		60.7		63.4		0.96		17

(1) Based on the fiscal year lead requirements for the period then ended.

We estimate that a 10% increase in our cost of lead (over our current estimated cost in fiscal 2012) would increase our annual total cost of goods sold by approximately $59 million.

Foreign Currency Exchange Rate Risks

We manufacture and assemble our products globally in the Americas, Europe and Asia. Approximately 60% of our sales and expenses are transacted in foreign currencies. Our sales revenue, production costs, profit margins and competitive position are affected by the strength of the currencies in countries where we manufacture or purchase goods relative to the strength of the currencies in countries where our products are sold. Additionally, as we report our financial statements in U.S. dollars, our financial results are affected by the strength of the currencies in countries where we have operations relative to the strength of the U.S. dollar. The principal foreign currencies in which we conduct business are the Euro, Swiss franc, British pound, Polish zloty, Chinese renminbi and Mexican peso.

We quantify and monitor our global foreign currency exposures. Our largest foreign currency exposure is from the purchase and conversion of U.S. dollar based lead costs into local currencies in Europe. Additionally, we have currency exposures from intercompany financing and trade transactions. On a selective basis, we enter into foreign currency forward contracts and option contracts to reduce the impact from the volatility of currency movements; however, we cannot be certain that foreign currency fluctuations will not impact our operations in the future.

To hedge these exposures, we have entered into forward contracts with financial institutions to fix the value at which we will buy or sell certain currencies. Each contract is for a period not extending beyond one year. Forward contracts outstanding as of March 31, 2012 were $53.5 million. The details of contracts outstanding as of March 31, 2012 were as follows:

Transactions Hedged	$US Equivalent (in  millions)		Average Rate Hedged		Approximate %  of Annual Requirements(2)
Sell Euros for U.S. dollars	$	16.7		$/€1.31		8	%
Sell Euros for Polish zloty		19.2		PLN/€ 4.36		19
Sell Euros for British pounds		12.9		£/€ 0.85		22
Sell AUD for U.S. dollars		2.7		$/AUD 1.03		45
Other		2.0
Total	$	53.5

(2) Based on the fiscal year currency requirements for the year ended March 31, 2012.

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Foreign exchange translation adjustments are recorded as a separate component of accumulated other comprehensive income in EnerSys’ stockholders’ equity and noncontrolling interests.

Based on changes in the timing and amount of interest rate and foreign currency exchange rate movements and our actual exposures and hedges, actual gains and losses in the future may differ from our historical results.

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ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

Contents

EnerSys

INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

	Page
Report of Independent Registered Public Accounting Firm (on Consolidated Financial Statements and Schedule)		49
Report of Independent Registered Public Accounting Firm (on Internal Control Over Financial Reporting)		50
Audited Consolidated Financial Statements
Consolidated Balance Sheets as of March 31, 2012 and 2011		51
Consolidated Statements of Income for the Fiscal Years Ended March 31, 2012, 2011 and 2010		52
Consolidated Statements of Changes in Stockholders’ Equity for the Fiscal Years Ended March  31, 2012, 2011 and 2010		53
Consolidated Statements of Cash Flows for the Fiscal Years Ended March 31, 2012, 2011 and 2010		54
Notes to Consolidated Financial Statements		55
1. Summary of Significant Accounting Policies		55
2. Acquisitions		61
3. Inventories		62
4. Property, Plant, and Equipment		63
5. Goodwill and Other Intangible Assets		63
6. Prepaid and Other Current Assets		64
7. Accrued Expenses		64
8. Debt		65
9. Leases		68
10. Other Liabilities		68
11. Fair Value of Financial Instruments		68
12. Derivative Financial Instruments		70
13. Income Taxes		73
14. Retirement Plans		75
15. Stockholders’ Equity		80
16. Secondary Offerings of Common Shares		81
17. Stock-Based Compensation		82
18. Earnings Per Share		85
19. Commitments, Contingencies and Litigation		85
20. Restructuring Plans		86
21. Warranty		88
22. Other (Income) Expense, Net and Charges Related to Refinancing		89
23. Operations by Industry Segment and Geographic Area		89
24. Quarterly Financial Data (Unaudited)		91
25. Subsequent Events		91

48

Report of Independent Registered Public Accounting Firm

The Board of Directors and Stockholders

EnerSys

We have audited the accompanying consolidated balance sheets of EnerSys as of March 31, 2012 and 2011, and the related consolidated statements of income, changes in stockholders’ equity, and cash flows for each of the three years in the period ended March 31, 2012. Our audits also included the financial statement schedule listed in the Index at Item 15(a). These financial statements and schedule are the responsibility of the Company’s management. Our responsibility is to express an opinion on these financial statements and schedule based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in all material respects, the consolidated financial position of EnerSys at March 31, 2012 and 2011, and the consolidated results of its operations and its cash flows for each of the three years in the period ended March 31, 2012, in conformity with U.S. generally accepted accounting principles. Also, in our opinion, the related financial statement schedule, when considered in relation to the basic financial statements taken as a whole, presents fairly in all material respects the information set forth therein.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), EnerSys’ internal control over financial reporting as of March 31, 2012, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated May 25, 2012 expressed an unqualified opinion thereon.

/s/ Ernst & Young LLP

Philadelphia, Pennsylvania

May 25, 2012

49

Report of Independent Registered Public Accounting Firm

The Board of Directors and Stockholders

EnerSys

We have audited EnerSys’ internal control over financial reporting as of March 31, 2012, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (the COSO criteria). EnerSys’ management is responsible for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Management Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the company’s internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, EnerSys maintained, in all material respects, effective internal control over financial reporting as of March 31, 2012, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheets of EnerSys as of March 31, 2012 and 2011 and the related consolidated statements of income, changes in stockholders’ equity, and cash flows for each of the three years in the period ended March 31, 2012 of EnerSys and our report dated May 25, 2012 expressed an unqualified opinion thereon.

/s/ Ernst & Young LLP

Philadelphia, Pennsylvania

May 25, 2012

50

EnerSys

Consolidated Balance Sheets

(In Thousands, Except Share and Per Share Data)

	March 31,
	2012			2011
Assets
Current assets:
Cash and cash equivalents	$	160,490		$	108,869
Accounts receivable, net of allowance for doubtful accounts (2012—$10,022; 2011—$10,547)		466,769			464,072
Inventories, net		361,774			335,003
Deferred taxes		30,247			19,801
Prepaid and other current assets		52,393			70,203
Total current assets		1,071,673			997,948
Property, plant, and equipment, net		353,215			344,385
Goodwill		347,061			343,666
Other intangible assets, net		107,082			98,819
Deferred taxes		15,999			15,785
Other assets		24,249			27,784
Total assets	$	1,919,279		$	1,828,387
Liabilities and stockholders’ equity
Current liabilities:
Short-term debt	$	16,042		$	3,160
Current portion of long-term debt		2,540			43
Current portion of capital lease obligations		409			819
Accounts payable		249,996			251,814
Accrued expenses		188,403			184,700
Deferred taxes		2,911			3,248
Total current liabilities		460,301			443,784
Long-term debt		236,589			247,949
Capital lease obligations		521			1,429
Deferred taxes		84,479			79,589
Other liabilities		92,468			76,643
Total liabilities		874,358			849,394
Commitments and contingencies		—			—
Equity:
Series A Convertible Preferred Stock, $0.01 par value, 1,000,000 shares authorized, no shares issued or outstanding at March 31, 2012 and at March 31, 2011		—			—
Common Stock, $0.01 par value, 135,000,000 shares authorized, 52,247,014 shares issued and 47,800,129 shares outstanding at March 31, 2012; 51,834,353 shares issued and 50,034,353 shares outstanding at March 31, 2011		522			518
Additional paid-in capital		474,924			461,597
Treasury stock at cost, 4,446,885 shares held as of March 31, 2012 and 1,800,000 shares held as of March 31, 2011		(78,183	)		(19,800	)
Retained earnings		560,839			416,836
Accumulated other comprehensive income		74,093			115,180
Total EnerSys stockholders’ equity		1,032,195			974,331
Noncontrolling interests		12,726			4,662
Total equity		1,044,921			978,993
Total liabilities and equity	$	1,919,279		$	1,828,387

See accompanying notes.

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EnerSys

Consolidated Statements of Income

(In Thousands, Except Share and Per Share Data)

	Fiscal year ended March 31,
	2012			2011		2010
Net sales	$	2,283,369		$	1,964,462	$	1,579,385
Cost of goods sold		1,770,664			1,514,618		1,218,481
Gross profit		512,705			449,844		360,904
Operating expenses		297,806			259,217		235,597
Legal proceedings settlement income		(900	)		—		—
Restructuring charges		4,988			6,813		13,929
Bargain purchase gain		—			—		(2,919	)
Operating earnings		210,811			183,814		114,297
Interest expense		16,484			22,038		22,658
Charges related to refinancing		—			8,155		—
Other (income) expense, net		3,068			2,177		4,384
Earnings before income taxes		191,259			151,444		87,255
Income tax expense		47,292			38,018		24,951
Net earnings		143,967			113,426		62,304
Net losses attributable to noncontrolling interests		(36	)		—		—
Net earnings attributable to EnerSys stockholders	$	144,003		$	113,426	$	62,304
Net earnings per common share attributable to EnerSys stockholders:
Basic	$	2.95		$	2.30	$	1.29
Diluted	$	2.93		$	2.27	$	1.28
Weighted-average shares of common stock outstanding:
Basic		48,748,205			49,376,132		48,122,207
Diluted		49,216,035			50,044,246		48,834,095

See accompanying notes.

52

EnerSys

Consolidated Statements of Changes in Stockholders’ Equity

(In Thousands)

	Series A Convertible Preferred Stock		Common Stock		Paid-in Capital			Treasury Stock			Retained Earnings		Accumulated Other Comprehensive Income			Total EnerSys Stockholders’ Equity			Non- Controlling Interest			Total Stockholders’ Equity
Balance at March 31, 2009	$	—	$	498	$	414,292		$	(19,800	)	$	241,106	$	34,055		$	670,151		$	4,242		$	674,393
Stock-based compensation		—		—		6,964			—			—		—			6,964			—			6,964
Exercise of stock options		—		6		5,036			—			—		—			5,042			—			5,042
Tax benefit from stock options		—		—		2,287			—			—		—			2,287			—			2,287
Increase in noncontrolling interest		—		—		—			—			—		—			—			85			85
Net earnings		—		—		—			—			62,304		—			62,304			—			62,304
Other comprehensive income:
Pension funded status adjustment, (net of tax benefit of $367)		—		—		—			—			—		(685	)		(685	)		—			(685	)
Unrealized income on derivative instruments (net of tax expense of $1,421)		—		—		—			—			—		2,626			2,626			—			2,626
Foreign currency translation adjustment		—		—		—			—			—		31,208			31,208			—			31,208
Comprehensive income																	95,453			—			95,453
Balance at March 31, 2010	$	—	$	504	$	428,579		$	(19,800	)	$	303,410	$	67,204		$	779,897		$	4,327		$	784,224
Stock-based compensation		—		—		9,056			—			—		—			9,056			—			9,056
Exercise of stock options		—		14		17,880			—			—		—			17,894			—			17,894
Tax benefit from stock options		—		—		6,082			—			—		—			6,082			—			6,082
Increase in noncontrolling interest		—		—		—			—			—		—			—			335			335
Net earnings		—		—		—			—			113,426		—			113,426			—			113,426
Other comprehensive income:
Pension funded status adjustment (net of tax expense of $794)		—		—		—			—			—		1,967			1,967			—			1,967
Unrealized income on derivative instruments (net of tax expense of $5,251)		—		—		—			—			—		9,470			9,470			—			9,470
Foreign currency translation adjustment		—		—		—			—			—		36,539			36,539			—			36,539
Comprehensive income																	161,402			—			161,402
Balance at March 31, 2011	$	—	$	518	$	461,597		$	(19,800	)	$	416,836	$	115,180		$	974,331		$	4,662		$	978,993
Stock-based compensation		—		—		11,585			—			—		—			11,585			—			11,585
Exercise of stock options		—		4		970			—			—		—			974			—			974
Tax benefit from stock options		—		—		1,772			—			—		—			1,772			—			1,772
Purchase of common stock		—		—		—			(58,383	)		—		—			(58,383	)		—			(58,383	)
Acquisition of noncontrolling interests		—		—		(1,000	)		—			—		—			(1,000	)		—			(1,000	)
Noncontrolling interests attributable to the consolidation of acquisitions		—		—		—			—			—		—			—			8,260			8,260
Net earnings		—		—		—			—			144,003		—			144,003			(36	)		143,967
Other comprehensive income:
Pension funded status adjustment, (net of tax benefit of $1,841)		—		—		—			—			—		(5,470	)		(5,470	)		—			(5,470	)
Unrealized losses on derivative instruments (net of tax benefit of $1,909)		—		—		—			—			—		(3,261	)		(3,261	)		—			(3,261	)
Foreign currency translation adjustment		—		—		—			—			—		(32,356	)		(32,356	)		(160	)		(32,516	)
Comprehensive income (loss)																	102,916			(196	)		102,720
Balance at March 31, 2012	$	—	$	522	$	474,924		$	(78,183	)	$	560,839	$	74,093		$	1,032,195		$	12,726		$	1,044,921

See accompanying notes.

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EnerSys

Consolidated Statements of Cash Flows

(In Thousands)

	Fiscal year ended March 31,
	2012			2011			2010
Cash flows from operating activities
Net earnings	$	143,967		$	113,426		$	62,304
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization		50,360			44,393			44,851
Derivatives not designated in hedging relationships:
Net losses		1,083			—			—
Cash settlements		(3,763	)		—			—
Provision for doubtful accounts		1,395			1,513			2,712
Deferred income taxes		(3,227	)		(3,064	)		6,975
Non-cash interest expense		7,983			7,776			7,163
Stock-based compensation		11,585			9,056			6,964
Write-off of deferred financing fees		—			2,308			—
Bargain purchase gain		—			—			(2,919	)
Gain on disposal of fixed assets		(432	)		—			(912	)
Changes in assets and liabilities, net of effects of acquisitions:
Accounts receivable		7,106			(61,892	)		(7,303	)
Inventory		(19,655	)		(67,250	)		(23,445	)
Prepaid expenses and other current assets		8,834			(15,658	)		(1,075	)
Other assets		(955	)		(2,552	)		(1,218	)
Accounts payable		(12,377	)		42,422			59,116
Accrued expenses		13,505			(3,822	)		(5,816	)
Other liabilities		(1,213	)		9,803			(10,795	)
Net cash provided by operating activities		204,196			76,459			136,602
Cash flows from investing activities
Capital expenditures		(48,943	)		(59,940	)		(45,111	)
Purchase of businesses, net of cash acquired		(24,553	)		(32,200	)		(33,242	)
Proceeds from disposal of property, plant, and equipment		76			479			1,109
Net cash used in investing activities		(73,420	)		(91,661	)		(77,244	)
Cash flows from financing activities
Net (decrease) increase in short-term debt		(462	)		3,084			(7,436	)
Proceeds from revolving credit borrowings		111,550			100,000			—
Repayment of revolving credit borrowings		(132,150	)		—			—
Proceeds from long-term debt—other		—			6,112			—
Payments of long-term debt—other		(308	)		(212,238	)		(25,243	)
Deferred financing fees incurred in connection with refinancing prior credit facility		—			(3,500	)		—
Capital lease obligations and other		(1,375	)		(111	)		878
Net effect from exercising of stock options and vesting of equity awards		974			17,894			5,042
Excess tax benefits from exercise of stock options and vesting of equity awards		1,772			6,082			2,287
Purchase of treasury stock		(58,383	)		—			—
Net cash used in financing activities		(78,382	)		(82,677	)		(24,472	)
Effect of exchange rate changes on cash		(773	)		5,706			2,995
Net increase (decrease) in cash and cash equivalents		51,621			(92,173	)		37,881
Cash and cash equivalents at beginning of year		108,869			201,042			163,161
Cash and cash equivalents at end of year	$	160,490		$	108,869		$	201,042

See accompanying notes.

54

EnerSys

Notes to Consolidated Financial Statements

March 31, 2012

(In Thousands, Except Share and Per Share Data)

1. Summary of Significant Accounting Policies

Description of Business

EnerSys and its predecessor companies have been manufacturers of industrial batteries for over 100 years. EnerSys is a global leader in stored energy solutions for industrial applications. The Company manufactures, markets and distributes industrial batteries and related products such as chargers, power equipment and battery accessories, and provides related after-market and customer-support services for industrial batteries.

Principles of Consolidation

The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries and any partially-owned subsidiaries that the Company has the ability to control. Control generally equates to ownership percentage, whereby investments that are more than 50% owned are generally consolidated, investments in affiliates of 50% or less but greater than 20% are generally accounted for using the equity method, and investments in affiliates of 20% or less are accounted for using the cost method. All intercompany transactions and balances have been eliminated in consolidation.

Foreign Currency Translation

Results of foreign operations are translated into U.S. dollars using average exchange rates during the period. The assets and liabilities are translated into U.S. dollars using exchange rates as of the balance sheet date. Gains or losses resulting from translating the foreign currency financial statements are accumulated as a separate component of accumulated other comprehensive income (“AOCI”) in EnerSys’ stockholders’ equity and noncontrolling interests.

Transaction gains and losses resulting from exchange rate changes on transactions denominated in currencies other than the functional currency of the applicable subsidiary are included in the Consolidated Statements of Income, within “Other (income) expense, net”, in the year in which the change occurs.

Revenue Recognition

The Company recognizes revenue when the earnings process is complete. This occurs when risk and title transfers, collectibility is reasonably assured and pricing is fixed and determinable. Shipment terms are either shipping point or destination and do not differ significantly between the Company’s business segments. Accordingly, revenue is recognized when risk and title are transferred to the customer. Amounts invoiced to customers for shipping and handling are classified as revenue. Taxes on revenue producing transactions are not included in net sales.

The Company recognizes revenue from the service of its reserve power and motive power products when the respective services are performed.

Accruals are made at the time of sale for sales returns and other allowances based on the Company’s historical experience.

Freight Expense

Amounts billed to customers for outbound freight costs are classified as sales in the consolidated statements of income. Costs incurred by the Company for outbound freight costs to customers, inbound and transfer freight are classified in cost of goods sold.

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Warranties

The Company’s products are warranted for a period ranging from one to twenty years for reserve power batteries and for a period ranging from one to seven years for motive power batteries. The Company provides for estimated product warranty expenses when the related products are sold. The assessment of the adequacy of the reserve includes a review of open claims and historical experience.

Cash and Cash Equivalents

Cash and cash equivalents include all highly liquid investments with an original maturity of three months or less when purchased.

Concentration of Credit Risk

Financial instruments that subject the Company to potential concentration of credit risk consist principally of short-term cash investments and trade accounts receivable. The Company invests its cash with various financial institutions and in various investment instruments limiting the amount of credit exposure to any one financial institution or entity. The Company has bank deposits that exceed federally-insured limits. In addition, certain cash investments may be made in U.S. and foreign government bonds, or other highly rated investments guaranteed by the U.S. or foreign governments. Concentration of credit risk with respect to trade receivables is limited by a large, diversified customer base and its geographic dispersion. The Company performs ongoing credit evaluations of its customers’ financial condition and requires collateral, such as letters of credit, in certain circumstances.

Accounts Receivable

The Company maintains allowances for doubtful accounts for estimated losses resulting from the inability of customers to make required payments. The allowance is based on management’s estimate of uncollectible accounts, analysis of historical data and trends, as well as reviews of all relevant factors concerning the financial capability of its customers. Accounts receivable are considered to be past due based on how payments are received compared to the customer’s credit terms. Accounts are written off when management determines the account is uncollectible.

Inventories

Inventories are stated at the lower of cost or market. Cost is determined using the first-in, first-out (FIFO) method. The cost of inventory consists of material, labor, and associated overhead.

Property, Plant, and Equipment

Property, plant, and equipment are recorded at cost and include expenditures that substantially increase the useful lives of the assets. Depreciation is provided using the straight-line method over the estimated useful lives of the assets as follows: 10 to 33 years for buildings and improvements and 3 to 15 years for machinery and equipment.

Maintenance and repairs are expensed as incurred. Interest on capital projects is capitalized during the construction period.

Goodwill and Other Intangible Assets

The Company records the excess of purchase price over the fair value of the tangible and identifiable intangible assets acquired as goodwill. Goodwill and indefinite-lived trade names are tested for impairment at

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least annually and whenever events or circumstances occur indicating that a possible impairment may have been incurred. The Company utilizes financial projections of its business segments, certain cash flow measures, as well as its market capitalization in its determination of the fair value of these assets.

Finite-lived assets such as purchased and licensed technology, patents and customer lists are amortized over their estimated useful lives, generally over periods ranging from 3 to 20 years. The Company reviews the carrying values of these assets for possible impairment whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable based on undiscounted estimated cash flows expected to result from its use and eventual disposition. The Company continually evaluates the reasonableness of the useful lives of these assets.

Impairment of Long-Lived Assets

The Company reviews the carrying values of its property and equipment for possible impairment whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable based on undiscounted estimated cash flows expected to result from its use and eventual disposition. The factors considered by the Company in performing this assessment include current operating results, trends and other economic factors. In assessing the recoverability of the carrying value of the property and equipment, the Company must make assumptions regarding future cash flows and other factors. If these estimates or the related assumptions change in the future, the Company may be required to record an impairment loss for these assets.

Environmental Expenditures

The Company records a loss and establishes a reserve for environmental remediation liabilities when it is probable that an asset has been impaired or a liability exists and the amount of the liability can be reasonably estimated. Reasonable estimates involve judgments made by management after considering a broad range of information including: notifications, demands or settlements that have been received from a regulatory authority or private party, estimates performed by independent engineering companies and outside counsel, available facts existing and proposed technology, the identification of other potentially responsible parties, their ability to contribute and prior experience. These judgments are reviewed quarterly as more information is received and the amounts reserved are updated as necessary. However, the reserves may materially differ from ultimate actual liabilities if the loss contingency is difficult to estimate or if management’s judgments turn out to be inaccurate. If management believes no best estimate exists, the minimum probable loss is accrued.

Derivative Financial Instruments

The Company utilizes derivative instruments to mitigate volatility related to interest rates, lead prices and foreign currency exposures. The Company does not hold or issue derivative financial instruments for trading or speculative purposes. The Company recognizes derivatives as either assets or liabilities in the accompanying balance sheet and measures those instruments at fair value. Changes in the fair value of those instruments are reported in AOCI if they qualify for hedge accounting or in earnings if they do not qualify for hedge accounting. Derivatives qualify for hedge accounting if they are designated as hedge instruments and if the hedge is highly effective in achieving offsetting changes in the fair value or cash flows of the asset or liability hedged. Effectiveness is measured on a regular basis using statistical analysis and by comparing the overall changes in the expected cash flows on the lead and foreign currency forward contracts with the changes in the expected all-in cash outflow required for the lead and foreign currency purchases. This analysis is performed on the initial purchases quarterly that cover the quantities hedged. Accordingly, gains and losses from changes in derivative fair value of effective hedges are deferred and reported in AOCI until the underlying transaction affects earnings.

The Company has commodity, foreign exchange and interest rate hedging authorization from the Board of Directors and has established a hedging and risk management program that includes the management of market and counterparty risk. Key risk control activities designed to ensure compliance with the risk management program include, but are not limited to, credit review and approval, validation of transactions and market prices,

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verification of risk and transaction limits, portfolio stress tests, sensitivity analyses and frequent portfolio reporting, including open positions, determinations of fair value and other risk management metrics.

Market risk is the potential loss the Company and its subsidiaries may incur as a result of price changes associated with a particular financial or commodity instrument. The Company utilizes forward contracts, and swaps as part of its risk management strategies, to minimize unanticipated fluctuations in earnings caused by changes in commodity prices, interest rates and/or foreign currency exchange rates. All derivatives are recognized on the balance sheet at their fair value, unless they qualify for Normal Purchase Normal Sale.

Credit risk is the potential loss the Company may incur due to counterparty’s non-performance. The Company is exposed to credit risk from interest rate, foreign currency and commodity derivatives with financial institutions. The Company has credit policies to manage their credit risk, including the use of an established credit approval process, monitoring of counterparty positions and the use of master netting agreements.

The Company has elected to offset net derivative positions under master netting arrangements. The Company does not have any positions involving cash collateral (payables or receivables) under a master netting arrangement as of March 31, 2012 and 2011.

The Company does not have any credit-related contingent features associated with their derivative instruments.

Fair Value of Financial Instruments

The fair value of the Company’s cash and cash equivalents, accounts receivable and accounts payable approximate carrying value due to their short maturities.

The fair value of the Company’s $350,000 senior secured revolving credit facility (“2011 Credit Facility”), the 75,000 Chinese Renminbi (“RMB”) credit facility (“China Term Loan”), the 273,780 Indian Rupee (“INR”) term loan (“India Term Loan”) and short-term debt approximate their carrying value, as they are variable rate debt and the current terms are comparable to market terms as of the balance sheet dates and are classified as Level 2.

The fair value amounts of the Company’s $172,500 senior unsecured 3.375% convertible notes (“Convertible Notes”) represent the trading values of the Convertible Notes which is based upon quoted market prices and are classified as Level 2.

Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (an exit price). The Company and its subsidiaries use, as appropriate, a market approach (generally, data from market transactions), an income approach (generally, present value techniques and option-pricing models), and/or a cost approach (generally, replacement cost) to measure the fair value of an asset or liability. These valuation approaches incorporate inputs such as observable, independent market data and/or unobservable data that management believes are predicated on the assumptions market participants would use to price an asset or liability. These inputs may incorporate, as applicable, certain risks such as nonperformance risk, which includes credit risk.

Lead contracts, foreign currency contracts and interest rate contracts generally use an income approach to measure the fair value of these contracts, utilizing readily observable inputs, such as forward interest rates (e.g., London Interbank Offered Rate—“LIBOR”) and forward foreign currency exchange rates (e.g., GBP and euro) and commodity prices (e.g. London Metals Exchange), as well as inputs that may not be observable, such as credit valuation adjustments. When observable inputs are used to measure all or most of the value of a contract, the contract is classified as Level 2. Over-the-counter (OTC) contracts are valued using quotes obtained from an exchange, binding and non-binding broker quotes. Furthermore, the Company obtains independent quotes from the market to validate the forward price curves. OTC contracts include forwards, swaps and options. To the extent possible, fair value measurements utilize various inputs that include quoted prices for similar contracts or market-corroborated inputs.

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When unobservable inputs are significant to the fair value measurement, a contract is classified as Level 3. The Company did not have any Level 3 positions at March 31, 2012 or March 31, 2011. Additionally, Level 2 fair value measurements include adjustments for credit risk based on the Company’s own creditworthiness (for net liabilities) and its counterparties’ creditworthiness (for net assets). The Company assumes that observable market prices include sufficient adjustments for liquidity and modeling risks. The Company did not have any contracts that transferred between Level 2 and Level 3 as well as Level 1 and Level 2.

Income Taxes

The Company accounts for income taxes in accordance with the Financial Accounting Standards Board (“FASB”) guidance, which requires deferred tax assets and liabilities be recognized using enacted tax rates to measure the effect of temporary differences between book and tax bases on recorded assets and liabilities. FASB guidance also requires that deferred tax assets be reduced by a valuation allowance, if it is more likely than not some portion or all of the deferred tax assets will not be recognized.

The Company evaluates on a quarterly basis its ability to realize deferred tax assets by assessing its valuation allowance and by adjusting the amount of such allowance, if necessary. The factors used to assess the likelihood of realization are forecasts of future taxable income and available tax planning strategies that could be implemented to realize the net deferred tax assets.

In accordance with FASB guidance on accounting for uncertainty in income taxes, the Company evaluates tax positions to determine whether the benefits of tax positions are more likely than not of being sustained upon audit based on the technical merits of the tax position. For tax positions that are more likely than not of being sustained upon audit, the Company recognizes the largest amount of the benefit that is greater than 50% likely of being realized upon ultimate settlement. For tax positions that are not more likely than not of being sustained upon audit, the Company does not recognize any portion of the benefit. If the more likely than not threshold is not met in the period for which a tax position is taken, the Company may subsequently recognize the benefit of that tax position if the tax matter is effectively settled, the statute of limitations expires, or if the more likely than not threshold is met in a subsequent period.

Deferred Financing Fees

Debt issuance costs that are incurred by the Company in connection with the issuance of debt are deferred and amortized to interest expense over the life of the underlying indebtedness, adjusted to reflect any early repayments.

Retirement Plans

The Company accounts for retirement plans in accordance with FASB guidance on employers’ accounting for defined benefit pension benefit plans, which requires an entity to recognize in its statement of financial position an asset for a defined benefit postretirement plan’s overfunded status or a liability for a plan’s underfunded status, and to measure a defined benefit postretirement plan’s assets and obligation that determine its funded status as of the end of the balance sheet date.

The Company uses certain assumptions in the calculation of the actuarial valuations of its defined benefit plans. These assumptions include discount rate, rates of increase in compensation levels and expected long-term rates of return of plan assets. If actual results are less favorable than those projected by the Company, additional expense may be required.

Stock-Based Compensation Plans

The Company accounts for stock compensation in accordance with FASB guidance, which requires the Company to measure the cost of employee services received in exchange for the award of an equity instrument

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based on the grant-date fair value of the award, with such cost recognized over the applicable vesting period. In addition, the guidance requires an entity to provide certain disclosures in order to assist in understanding the nature of share-based payment transactions and the effects of those transactions on the financial statements.

Market Share Units

The fair value of the market share units is estimated at the date of grant using a binomial lattice model with the following assumptions: a risk-free interest rate, dividend yield, time to maturity and expected volatility. These units vest and are settled in common stock on the third anniversary of the date of grant. Market share units are converted into between zero and two shares of common stock for each unit granted at the end of a three-year performance cycle. The conversion ratio is calculated by dividing the average closing share price of the Company’s common stock during the ninety calendar days immediately preceding the vesting date by the average closing share price of the Company’s common stock during the ninety calendar days immediately preceding the grant date, with the resulting quotient capped at two. This quotient is then multiplied by the number of market share units granted to yield the number of shares of common stock to be delivered on the vesting date. The Company recognizes compensation expense using the straight-line method over the life of the market share units.

Restricted Stock Units

The fair value of restricted stock units is based on the closing market price of the Company’s common stock on the date of grant. These awards generally vest, and are settled in common stock, at 25% per year, over a four-year period from the date of grant. The Company recognizes compensation expense using the straight-line method over the life of the restricted stock units.

Stock Options

The fair value of the options granted is estimated at the date of grant using the Black-Scholes option-pricing model utilizing assumptions based on historical data and current market data. The assumptions include expected term of the options, risk-free interest rate, expected volatility, and dividend yield. The expected term represents the expected amount of time that options granted are expected to be outstanding, based on historical and forecasted exercise behavior. The risk-free rate is based on the rate at grant date of zero-coupon U.S. Treasury Notes with a term equal to the expected term of the option. Expected volatility is estimated using historical volatility rates based on historical weekly price changes. The Company’s dividend yield is based on historical data. The Company recognizes compensation expense using the straight-line method over the vesting period of the options.

Earnings Per Share

Basic earnings per common share (“EPS”) are computed by dividing net earnings available to common stockholders by the weighted average number of common shares outstanding for the period. Diluted EPS reflects the potential dilution that would occur if securities or other contracts to issue common stock were exercised or converted into common stock. At March 31, 2012, 2011 and 2010, the Company had outstanding stock options, restricted stock units, market share units and Convertible Notes, which could potentially dilute basic earnings per share in the future.

Segment Reporting

FASB guidance defines that a segment for reporting purposes is based on the financial performance measures that are regularly reviewed by the chief operating decision maker to assess segment performance and to make decisions about a public entity’s allocation of resources. Based on this guidance, the Company reports its segment results based upon the three geographical regions of operations—Americas, Europe and Asia.

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New Accounting Pronouncements

In June 2011, the FASB issued authoritative guidance requiring entities to present net income and other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements and eliminated the option to present components of other comprehensive income as part of the statement of shareholders’ equity. This guidance will be effective for the Company in the first quarter of fiscal 2013 and is not expected to have an impact on its financial statements other than the change in presentation.

In September 2011, the FASB issued revised guidance to simplify how entities test goodwill for impairment. The amendments will permit an entity to first assess qualitative factors to determine whether it is necessary to perform the two-step goodwill impairment test. An entity will no longer be required to calculate the fair value of a reporting unit unless the entity determines, based on a qualitative assessment that it is more likely than not that its fair value is less than its carrying amount. The amendments are effective for annual and interim goodwill impairment tests performed for fiscal years beginning after December 15, 2011, with early adoption permitted. The Company plans to adopt this guidance for its annual goodwill impairment test performed in fiscal 2013 and thereafter. The adoption will not have an impact on the Company’s financial statements.

Effective January 2, 2012, the Company prospectively adopted accounting guidance that was issued to clarify existing fair value measurement guidance as well as enhance fair value disclosures. The additional disclosures required by this guidance include quantitative information about significant unobservable inputs used for Level 3 measurements, qualitative information about the sensitivity of recurring Level 3 measurements, information about any transfers between Level 1 and 2 of the fair value hierarchy, information about when the current use of a non-financial asset is different from the highest and best use, and the hierarchy classification for assets and liabilities whose fair value is disclosed only in the notes to the financial statements. The adoption of this standard did not have a material impact on the Company’s financial statements.

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.

Reclassifications

Certain amounts in the prior years’ financial statements have been reclassified to conform to the current-year presentation.

2. Acquisitions

In fiscal 2012, the Company completed the following four acquisitions with a combined net purchase price of $24,553, using cash on hand.

The Company obtained a controlling financial interest in Powertech Batteries (which is a part of Allied Electronics Corporation Limited (Altron)), in South Africa to produce and market batteries for industrial applications. This will serve both reserve power and motive power customers across sub-Saharan Africa, including South Africa.

The Company obtained a controlling financial interest in EAS Germany GmBH, to produce large format lithium-ion battery cells with GAIA Akkumulatorenwerke GmbH (“GAIA”), a wholly owned subsidiary of Lithium Technology Corporation (“LTC”).

The Company obtained a controlling financial interest in Energy Leader Batteries India Limited in India to serve both reserve and motive power customers in India.

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The Company has also acquired Industrial Battery Holding S.A., the parent company of EnerSystem, a market leader in the South American motive power and reserve power battery markets, with headquarters in Buenos Aires, Argentina and with manufacturing plants in Argentina and Brazil as well as operations in Chile.

The Company is in the process of finalizing purchase accounting for these acquisitions. The Company made initial allocations of the purchase prices at the dates of the acquisitions based on the estimated fair value of the acquired assets and liabilities assumed. The Company obtained this information during due diligence and through other sources. The Company will finalize the estimates of fair value and the allocations of purchase prices will be adjusted during fiscal 2013. The Company acquired intangible assets, in connection with each acquisition, including trademarks, customer relationships, technology and goodwill. Trademarks were initially valued at $2,000, non-compete agreements at $500, customer relationships at $3,400 and technology at $4,265. Customer relationships, non-compete agreements and technology were assigned finite useful lives and amortization is recorded over the economic life of the intangibles. Goodwill relating to these acquisitions was recorded at $10,723.

The results of these acquisitions have been included in the Company’s results of operations from the dates of their respective acquisitions. Pro forma earnings per share computations have not been presented as these acquisitions are not considered material.

In fiscal 2011, the Company made three acquisitions, the most significant of which was the acquisition of the lithium-ion battery business, ABSL Power Solutions Ltd (“ABSL”), which was completed on February 28, 2011. The purchase price paid for these transactions, net of cash received, was $32,200 and was financed using cash on hand. The Company finalized purchase accounting for these acquisitions. The Company acquired intangible assets, in connection with the ABSL acquisition, including trademarks, customer relationships, technology and goodwill. Trademarks were valued at $1,774, customer relationships at $3,547 and technology at $2,741. Customer relationships and technology were assigned finite useful lives and amortization is recorded over the economic life of the intangibles. Goodwill relating to the acquisition of ABSL was recorded at $15,342.

In fiscal 2010, the Company made three acquisitions, the most significant of which was the acquisition of the industrial battery businesses of the Swiss company Accu Holding AG, which included the acquisition of the stock of OEB Traction Batteries and the operating assets and liabilities of Oerlikon Stationery Batteries and its Swedish sales subsidiary (all collectively referred to as “Oerlikon”) during November 2009. The accounting for the Oerlikon acquisition resulted in the recognition of a bargain purchase gain of $2,919. The total purchase price for these transactions, net of cash received, was $33,242 and was financed using cash on hand.

These acquisitions and the investment provide the Company with an additional range of well respected and designed products for use in high integrity applications in telecommunications, utilities, rail, material handling and mining, as well as other sectors.

In connection with certain of its acquisitions, the Company formulated restructuring plans for the integration of the acquired businesses. See Note 20 for additional information regarding these plans.

3. Inventories

Net inventories consist of:

	March 31,
	2012		2011
Raw materials	$	100,538	$	92,928
Work-in-process		111,629		100,261
Finished goods		149,607		141,814
Total	$	361,774	$	335,003

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Inventory reserves for obsolescence and other estimated losses, mainly relating to finished goods, were $14,831 and $15,052 at March 31, 2012 and 2011, respectively, and have been included in the net amounts shown above.

4. Property, Plant, and Equipment

Property, plant, and equipment consist of:

	March 31,
	2012			2011
Land, buildings, and improvements	$	201,038		$	174,887
Machinery and equipment		511,599			475,818
Construction in progress		29,779			51,662
		742,416			702,367
Less accumulated depreciation		(389,201	)		(357,982	)
Total	$	353,215		$	344,385

Depreciation expense for the fiscal years ended March 31, 2012, 2011 and 2010 totaled $48,532, $43,517, and $44,145, respectively. Interest capitalized in connection with major construction projects amounted to $797, $1,292, and $929 for the fiscal years ended March 31, 2012, 2011 and 2010, respectively.

5. Goodwill and Other Intangible Assets

Information regarding the Company’s other intangible assets are as follows:

	March 31,
	2012							2011
	Gross Amount		Accumulated Amortization			Net Amount		Gross Amount		Accumulated Amortization			Net Amount
Indefinite-lived intangible assets:
Trademarks	$	86,745	$	(953	)	$	85,792	$	83,021	$	(953	)	$	82,068
Finite-lived intangible assets:
Customer relationships		14,330		(2,839	)		11,491		11,064		(1,880	)		9,184
Non-compete		2,602		(1,224	)		1,378		2,117		(954	)		1,163
Patents		5,230		(615	)		4,615		3,402		(210	)		3,192
Trademarks		2,003		(643	)		1,360		3,771		(559	)		3,212
Licenses		2,640		(194	)		2,446		82		(82	)		—
Total	$	113,550	$	(6,468	)	$	107,082	$	103,457	$	(4,638	)	$	98,819

The Company’s amortization expense related to finite-lived intangible assets was $1,828, $876, and $706, for the years ended March 31, 2012, 2011 and 2010, respectively. The expected amortization expense based on the finite-lived intangible assets as of March 31, 2012, is $2,463 in 2013, $2,238 in 2014, $2,124 in 2015, $2,092 in 2016 and $1,966 in 2017.

The changes in the carrying amount of goodwill by business segment are as follows:

	Fiscal year ended March 31, 2012
	Europe			Americas			Asia		Total
Balance at beginning of year	$	177,881		$	143,225		$	22,560	$	343,666
Goodwill acquired during the year		1,250			7,973			1,500		10,723
Adjustments related to the finalization of purchase accounting for prior year acquisitions		374			5			—		379
Foreign currency translation		(7,977	)		(449	)		719		(7,707	)
Balance at end of year	$	171,528		$	150,754		$	24,779	$	347,061

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	Fiscal year ended March 31, 2011
	Europe		Americas		Asia		Total
Balance at beginning of year	$	162,641	$	132,915	$	21,709	$	317,265
Goodwill acquired during the year		7,710		7,591		—		15,301
Adjustments related to the finalization of purchase accounting for prior year acqusitions		24		2,250		—		2,274
Foreign currency translation		7,506		469		851		8,826
Balance at end of year	$	177,881	$	143,225	$	22,560	$	343,666

The Company estimated tax-deductible goodwill to be approximately $12,745 and $14,982 as of March 31, 2012 and 2011, respectively.

6. Prepaid and Other Current Assets

Prepaid and other current assets consist of the following:

	March 31,
	2012		2011
Prepaid non income taxes	$	23,737	$	22,753
Non-trade receivables		8,247		8,214
Prepaid income taxes		7,716		15,986
Lead hedges		—		9,575
Other		12,693		13,675
Total	$	52,393	$	70,203

7. Accrued Expenses

Accrued expenses consist of the following:

	March 31,
	2012		2011
Payroll and benefits	$	55,595	$	58,794
Accrued selling expenses		26,269		24,257
Warranty		19,274		16,218
Income taxes payable		16,979		15,591
VAT and other non-income taxes		10,966		11,937
Freight		12,314		10,208
Deferred income		12,057		7,107
Interest rate swaps		3,628		—
Interest		2,040		2,471
Pension and social security		1,696		1,854
Restructuring		1,186		5,323
Other		26,399		30,940
Total	$	188,403	$	184,700

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8. Debt

Summary of Long-Term Debt

The following summarizes the Company’s long-term debt:

	March 31,
	2012		2011
3.375% Convertible Notes, net of discount, due 2038	$	148,272	$	141,837
2011 Credit Facility due 2016		79,400		100,000
China Term Loan due 2017		6,034		6,112
India Term Loan due 2017		5,383		—
Other		40		43
		239,129		247,992
Less current portion		2,540		43
Total long-term debt	$	236,589	$	247,949

2011 Senior Secured Revolving Credit Facility

On March 29, 2011, the Company entered into a $350,000 senior secured revolving credit facility (“2011 Credit Facility”). The 2011 Credit Facility matures on March 31, 2016. This facility includes an early termination provision under which the Company is required to meet a liquidity test in February 2015 related to its capacity to meet certain potential obligations related to the Convertible Notes in June 2015. Borrowings under the 2011 Credit Facility bear interest at a floating rate based, at the Company’s option, upon (i) LIBOR plus an applicable percentage (currently 1.25%), (ii) the greater of the Federal Funds rate plus 0.50% or the prime rate, or one-month LIBOR plus 1.0%, plus an applicable percentage (currently 0.25%). There are no prepayment penalties on loans under the 2011 Credit Facility. The interest rate as of March 31, 2012 was 1.60%.

Obligations under the 2011 Credit Facility are secured by substantially all of the Company’s existing and future acquired assets, including substantially all of the capital stock of the Company’s United States subsidiaries that are guarantors under the new credit facility, and 65% of the capital stock of certain of the Company’s foreign subsidiaries that are owned by the Company’s United States companies.

China Term Loan

During the fourth quarter of fiscal 2011, the Company completed the financing of a 75,000 Chinese Renminbi (RMB) ($11,909) credit facility (“China Term Loan”). This is a six year term loan to provide a portion of the capital requirements for the Company’s operations in China. At March 31, 2012, the Company had drawn RMB 38,000 ($6,034). This term loan currently bears interest at a rate of 7.26% per annum, adjusted annually, based on the official Peoples Bank of China Bank Rate and is payable in quarterly installments of RMB 2,000 ($318) commencing in April 2012.

India Term Loan

During the fourth quarter of fiscal 2012, the Company entered into a joint venture with Energy Leader Batteries India Limited in India, where the Company acquired majority ownership. The joint venture had, at March 31, 2012, a syndicated term loan (“India Term Loan”) with an outstanding balance of 273,780 Indian Rupee (INR) ($5,383). The India Term Loan bears interest at a rate of 15.1% per annum adjusted every two years based on the prevailing Indian Benchmark Prime Lending Rate (“BPLR”) and is payable in equal quarterly installments of 15,000 INR ($295) over five years.

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Senior Unsecured 3.375% Convertible Notes

On May 28, 2008, the Company completed a registered offering of $172,500 aggregate principal amount of senior unsecured 3.375% Convertible Notes Due 2038 (“Convertible Notes”) (see prospectus and supplemental indenture dated May 28, 2008). The Company received net proceeds of $168,200 after the deduction of commissions and offering expenses. The Company used all of the net proceeds to repay a portion of its then existing 2004 senior secured credit facility.

The Convertible Notes are general senior unsecured obligations and rank equally with the Company’s existing and future senior unsecured obligations and are junior to any of the Company’s future secured obligations to the extent of the value of the collateral securing such obligations. The Convertible Notes are not guaranteed, and are structurally subordinate in right of payment to, all of the (i) existing and future indebtedness and other liabilities of the Company’s subsidiaries and (ii) preferred stock of the Company’s subsidiaries to the extent of their respective liquidation preferences.

The Convertible Notes require the semi-annual payment of interest in arrears on June 1 and December 1 of each year beginning December 1, 2008, at 3.375% per annum on the principal amount outstanding. The Convertible Notes will accrete principal beginning on June 1, 2015 and will bear contingent interest, if any, beginning with the six-month interest period commencing on June 1, 2015 under certain circumstances. The Convertible Notes will mature on June 1, 2038. Prior to maturity the holders may convert their Convertible Notes into shares of the Company’s common stock at any time after March 1, 2015 or prior to that date under certain circumstances. When issued, the initial conversion rate was 24.6305 shares per $1,000 principal amount of Convertible Notes, which was equivalent to an initial conversion price of $40.60 per share.

At any time after June 6, 2015, the Company may at its option redeem the Convertible Notes, in whole or in part, for cash, at a redemption price equal to 100% of the principal amount of Convertible Notes to be redeemed, plus any accrued and unpaid interest. A holder of Convertible Notes may require the Company to repurchase some or all of the holder’s Convertible Notes for cash upon the occurrence of a fundamental change as defined in the indenture and on each of June 1, 2015, 2018, 2023, 2028 and 2033 at a price equal to 100% of the principal amount of the Convertible Notes being repurchased, plus accrued and unpaid interest, if any, in each case. It is the Company’s current intent to settle the principal amount of any conversions in cash, and any additional conversion consideration in cash, shares of EnerSys common stock or a combination of cash and shares. The Convertible Notes will mature on June 1, 2038, unless earlier converted, redeemed or repurchased.

If applicable, the Company will pay a make-whole premium on Convertible Notes converted in connection with certain fundamental changes that occur prior to June 6, 2015. The amount of the make-whole premium, if any, will be based on the Company’s stock price and the effective date of the fundamental change. The indenture contains a detailed description of how the make-whole premium will be determined and a table showing the make-whole premium that would apply at various stock prices. No make-whole premium would be paid if the price of the Common Stock on the effective date of the fundamental change is less than $29.00. Any make-whole premium will be payable in shares of Common Stock (or the consideration into which the Company’s Common Stock has been exchanged in the fundamental change) on the conversion date for the Convertible Notes converted in connection with the fundamental change.

The Convertible Notes were issued in an offering registered under the Securities Act of 1933, as amended (Securities Act).

In accordance with FASB guidance on the accounting for convertible debt instruments that may be settled in cash upon conversion (including partial settlement), the liability and equity components are separated in a manner that will reflect the entity’s non-convertible debt borrowing rate when interest expense is recognized in subsequent periods.

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The following represents the principal amount of the liability component, the unamortized discount, and the net carrying amount of our Convertible Notes as of March 31, 2012 and 2011, respectively:

	March 31, 2012			March 31, 2011
Principal	$	172,500		$	172,500
Unamortized discount		(24,228	)		(30,663	)
Net carrying amount	$	148,272		$	141,837
Carrying amount of equity component	$	29,850		$	29,850

As of March 31, 2012, the remaining discount will be amortized over a period of 38 months. The conversion price of the $172,500 in aggregate principal amount of the Convertible Notes is $40.60 per share and the number of shares on which the aggregate consideration to be delivered upon conversion is 4,248,761.

The effective interest rate on the liability component of the Convertible Notes was 8.50%. The amount of interest cost recognized for the amortization of the discount on the liability component of the Convertible Notes was $6,435, $5,917 and $5,439, respectively, for the fiscal years ended March 31, 2012, 2011 and 2010.

As of March 31, 2012 and 2011, the Company had available and undrawn, under all its lines of credit, $377,230 and $356,447, respectively. Included in the March 31, 2012 and 2011 amounts are $95,340 and $95,049, respectively, of uncommitted lines of credit.

The Company paid $8,933, $16,101 and $16,456, net of interest received, for interest during the fiscal years ended March 31, 2012, 2011 and 2010, respectively.

Aggregate maturities of long-term debt (including $24,228 of Convertible Notes discount) are as follows at March 31, 2012:

2013	$	2,540
2014		2,450
2015		2,450
2016		254,350
2017		1,567
Thereafter		—
	$	263,357

The Company’s financing agreements contain various covenants, which, absent prepayment in full of the indebtedness and other obligations, or the receipt of waivers, would limit the Company’s ability to conduct certain specified business transactions including incurring debt, mergers, consolidations or similar transactions, buying or selling assets out of the ordinary course of business, engaging in sale and leaseback transactions, paying dividends and certain other actions. The Company is in compliance with all such covenants.

As of March 31, 2012 and 2011, the Company had $9,108 and $1,150, respectively, of standby letters of credit outstanding under the 2011 Credit Facility and other credit arrangements. As of March 31, 2012 and 2011, the Company had no bank guarantees.

Deferred Financing Fees

In fiscal 2011, in connection with the refinancing of the Company’s previous credit facility, the Company wrote-off $2,308 of unamortized deferred financing fees associated with the previous Credit Facility, and incurred $3,500 in new deferred financing fees.

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Deferred financing fees, net of accumulated amortization totaled $4,634 and $5,912 as of March 31, 2012 and 2011, respectively. Amortization expense, relating to deferred financing fees, included in interest expense was $1,278, $1,861, and $1,724 for the fiscal years ended March 31, 2012, 2011 and 2010, respectively.

9. Leases

The Company’s future minimum lease payments under capital and operating leases that have noncancelable terms in excess of one year at March 31, 2012 are as follows:

	Capital Leases		Operating Leases
2013	$	451	$	18,268
2014		475		13,478
2015		84		10,108
2016		14		6,981
2017		7		5,008
Thereafter		—		3,588
Total minimum lease payments		1,031	$	57,431
Amounts representing interest		101
Net minimum lease payments, including current portion of $409	$	930

Rental expense was $31,619, $28,047, and $26,957 for the fiscal years ended March 31, 2012, 2011 and 2010, respectively. Amortization of capitalized leased assets is included in depreciation expense. Certain operating lease agreements contain renewal or purchase options and/or escalation clauses.

10. Other Liabilities

Other long-term liabilities consist of the following:

	March 31,
	2012		2011
Pension and profit sharing obligation	$	35,804	$	29,297
Warranty		22,793		19,788
Long-term income taxes liabilities		13,520		11,320
Deferred income		6,094		3,839
Interest rate swap liabilities		244		5,847
Other		14,013		6,552
Total	$	92,468	$	76,643

11. Fair Value Of Financial Instruments

FASB guidance defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. This guidance includes a fair value hierarchy that is intended to increase consistency and comparability in fair value measurements and related disclosures. The fair value hierarchy is based on inputs to valuation techniques that are used to measure fair value that are either observable or unobservable. Observable inputs reflect assumptions market participants would use in pricing an asset or liability based on market data obtained from independent sources while unobservable inputs reflect a reporting entity’s pricing based upon their own market assumptions. The Company uses the following valuation techniques to measure fair value for its financial assets and financial liabilities:

Level 1 Inputs are unadjusted quoted prices in active markets for identical assets or liabilities.

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Level 2	Inputs are quoted prices for similar assets or liabilities in an active market, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable and market-corroborated inputs which are derived principally from or corroborated by observable market data.
Level 3	Inputs are derived from valuation techniques in which one or more significant inputs or value drivers are unobservable.

The following tables represent the financial assets and (liabilities), measured at fair value on a recurring basis as of March 31, 2012 and March 31, 2011 and the basis for that measurement:

	Total Fair Value Measurement March 31, 2012			Quoted Price in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Interest rate swap agreements	$	(3,872	)	$	—	$	(3,872	)	$	—
Lead forward contracts		(851	)		—		(851	)		—
Foreign currency forward contracts		782			—		782			—
Total derivatives	$	(3,941	)	$	—	$	(3,941	)	$	—

	Total Fair Value Measurement March 31, 2011			Quoted Price in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Interest rate swap agreements	$	(5,847	)	$	—	$	(5,847	)	$	—
Lead forward contracts		9,575			—		9,575			—
Foreign currency forward contracts		(2,591	)		—		(2,591	)		—
Total derivatives	$	1,137		$	—	$	1,137		$	—

The fair value of interest rate swap agreements are based on observable prices as quoted for receiving the variable three month LIBOR and paying fixed interest rates and, therefore, were classified as Level 2.

The fair value of lead forward contracts are calculated using observable prices for lead as quoted on the London Metal Exchange (“LME”) and, therefore, were classified as Level 2.

The fair value for foreign currency forward contracts are based upon current quoted market prices and are classified as Level 2 based on the nature of the underlying market in which these derivatives are traded.

Financial Instruments

The fair value of the Company’s cash and cash equivalents, accounts receivable and accounts payable approximate carrying value due to their short maturities.

The fair value of the Company’s 2011 Credit Facility, the China Term Loan, the India Term Loan and short-term debt approximate their carrying value, as they are variable rate debt and the current terms are comparable to market terms as of the balance sheet dates.

The Convertible Notes, with a face value of $172,500, were issued when the Company’s stock price was trading at $30.19 per share. On March 31, 2012, the Company’s stock price closed at $34.65 per share. The Convertible Notes have a conversion option at $40.60 per share, and due to current conditions in the financial markets, the Company’s Convertible Notes were trading at 116% of face value on March 31, 2012, and 125% of face value on March 31, 2011. As of March 31, 2012 and 2011, the unamortized discount on the Convertible Notes was $24,228 and $30,663, respectively.

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The carrying amounts and estimated fair values of the Company’s derivatives and Convertible Notes at March 31, 2012 and 2011 were as follows:

	March 31, 2012						March 31, 2011
	Carrying Amount			Fair Value			Carrying Amount			Fair Value
Financial assets:
Derivatives(1)	$	782		$	782		$	9,575		$	9,575
Financial liabilities:
Convertible Notes	$	148,272	(2)	$	200,100	(3)	$	141,837	(2)	$	215,625	(3)
Derivatives(1)		4,723			4,723			8,438			8,438

(1) Represents interest rate swap agreements, lead and foreign currency hedges (see Note 12 for asset and liability positions of the interest rate swap agreements, lead and foreign currency hedges at March 31, 2012 and March 31, 2011).

(2) The carrying amounts of the Convertible Notes at March 31, 2012 and March 31, 2011 represent the $172,500 principal value, less the unamortized debt discount (see Note 8).

(3) The fair value amounts of the Convertible Notes represent the trading values of the Convertible Notes with a principal value of $172,500 at March 31, 2012 and March 31, 2011.

12. Derivative Financial Instruments

The Company utilizes derivative instruments to reduce its exposure to commodity price, foreign exchange risks and interest rates, under established procedures and controls. The Company does not enter into derivative contracts for speculative purposes. The Company’s agreements are with creditworthy financial institutions and the Company anticipates performance by counterparties to these contracts and therefore no material loss is expected.

Derivatives in Cash Flow Hedging Relationships

Lead Hedge Forward Contracts

The Company enters into lead hedge forward contracts to fix the price for a portion of lead purchases. Management considers the lead hedge forward contracts to be effective against changes in the cash flows of the underlying lead purchases based on the criteria under FASB guidance. The vast majority of such contracts are for a period not extending beyond one year and the notional amounts at March 31, 2012 and 2011 were 60.0 million and 63.4 million pounds, respectively.

Foreign Currency Forward Contracts

The Company purchases lead and other commodities in certain countries where the foreign currency exposure is different from the functional currency of that country. The Company uses foreign currency forward contracts to hedge a portion of the Company’s foreign currency exposures for lead and other commodities purchases so that gains and losses on these contracts offset changes in the underlying foreign currency denominated exposures. Each contract is for a period not extending beyond one year. As of March 31, 2012 and 2011, the Company had entered into a total of $42,121 and $71,930, respectively, of such contracts.

In the coming twelve months, the Company anticipates that $1,784 of pretax gain relating to lead and foreign currency forward contracts will be reclassified from AOCI as part of cost of goods sold. This amount represents the current unrealized impact of hedging lead and foreign exchange rates, which will change as market rates change in the future, and will ultimately be realized in the income statement as an offset to the corresponding actual changes in lead costs to be realized in connection with the variable lead cost and foreign exchange rates being hedged.

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Derivatives not Designated in Hedging Relationships

Interest Rate Swap Agreements

As of March 31, 2012 and March 31, 2011, the Company maintained interest rate swap agreements that converted $85,000 of variable-rate debt to a fixed-rate basis, utilizing the three-month LIBOR, as a floating rate reference. These agreements, which expire between February 2013 and May 2013, no longer qualified for hedge accounting at the end of fiscal 2011 as a result of the refinancing of the Company’s previous credit facility. Changes in the fair value of these agreements of $977 in expense during the twelve months of fiscal 2012 have been recorded in the consolidated statements of income in other (income) expense, net. In fiscal 2011, the changes in the fair value of these agreements were recorded in AOCI.

Foreign Currency Forward Contracts

The Company also enters into foreign currency forward contracts to economically hedge foreign currency fluctuations on intercompany loans and foreign currency denominated receivables. These are not designated as hedging instruments. The notional amount of these contracts was $11,410 as of March 31, 2012. Net changes in the fair value of these agreements of $106 in expense during the twelve months of fiscal 2012 have been recorded in the consolidated statements of income in other (income) expense, net.

Presented below in tabular form is information on the location and amounts of derivative fair values in the consolidated balance sheets and derivative gains and losses in the Consolidated Statements of Income:

Fair Value of Derivative Instruments

March 31, 2012 and 2011

	Derivatives and Hedging Activities Designated as Cash Flow Hedges				Derivatives and Hedging Activities Not Designated as Hedging  Instruments
	March 31, 2012		March 31, 2011		March 31, 2012		March 31, 2011
Prepaid and other current assets
Lead hedge forward contracts	$	—	$	9,575	$	—	$	—
Foreign currency forward contracts		670		—		112		—
Other assets		30		—		—		—
Total assets	$	700	$	9,575	$	112	$	—
Accrued expenses
Interest rate swap agreements	$	—	$	—	$	3,628	$	—
Lead hedge forward contracts		881		—		—		—
Foreign currency forward contracts		—		2,591		—		—
Other liabilities
Interest rate swap agreements		—		—		244		5,847
Total liabilities	$	881	$	2,591	$	3,872	$	5,847

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The Effect of Derivative Instruments on the Consolidated Statements of Income

For the fiscal year ended March 31, 2012

Derivatives Designated as Cash Flow Hedges	Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)			Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	Gain (Loss) Reclassified from AOCI into Income (Effective Portion)
Lead hedge forward contracts	$	(9,731	)	Cost of goods sold	$	(831	)
Foreign currency forward contracts		(152	)	Cost of goods sold		(3,882	)
Total	$	(9,883	)		$	(4,713	)

Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss) Recognized in Income on Derivative	Gain (Loss)
Interest rate swap contracts	Other (income) expense, net	$	(977	)
Foreign currency forward contracts	Other (income) expense, net		(106	)
Total		$	(1,083	)

The Effect of Derivative Instruments on the Consolidated Statements of Income

For the fiscal year ending March 31, 2011

Derivatives in a Cash Flow Hedging Relationship	Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)			Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	Gain (Loss) Reclassified from AOCI into Income (Effective Portion)
Interest rate swap contracts	$	(2,835	)	Interest expense	$	(6,698	)
Lead hedge forward contracts		15,930		Cost of goods sold		6,417
Foreign currency forward contracts		(4,031	)	Cost of goods sold		471
Total	$	9,064			$	190

Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss) Recognized in Income on Derivative	Gain (Loss)
Interest rate swap contracts	Charges related to refinancing	$	(5,847	)
Total		$	(5,847	)

The Effect of Derivative Instruments on the Consolidated Statements of Income

For the fiscal year ending March 31, 2010

Derivatives in a Cash Flow Hedging Relationship	Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)			Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	Gain (Loss) Reclassified from AOCI into Income (Effective Portion)
Interest rate swap contracts	$	(3,141	)	Interest expense	$	(7,059	)
Lead hedge forward contracts		9,844		Cost of goods sold		11,973
Foreign currency forward contracts		2,679		Cost of goods sold		428
Total	$	9,382				$5,342

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13. Income Taxes

Income tax expense is composed of the following:

	Fiscal year ended March 31,
	2012			2011			2010
Current:
Federal	$	30,459		$	24,232		$	9,000
State		3,778			2,736			(981	)
Foreign		16,282			14,114			9,957
Total current		50,519			41,082			17,976
Deferred:
Federal		(1,609	)		(1,358	)		4,678
State		(962	)		2,010			852
Foreign		(656	)		(3,716	)		1,445
Total deferred		(3,227	)		(3,064	)		6,975
Income tax expense	$	47,292		$	38,018		$	24,951

Earnings before income taxes consists of the following:

	Fiscal year ended March 31,
	2012		2011		2010
United States	$	87,597	$	57,710	$	37,418
Foreign		103,662		93,734		49,837
Earnings before income taxes	$	191,259	$	151,444	$	87,255

Income taxes paid by the Company for the fiscal years ended March 31, 2012, 2011 and 2010 were $38,482, $41,800 and $22,553, respectively.

The following table sets forth the tax effects of temporary differences that give rise to significant portions of the deferred tax assets and liabilities:

	March 31,
	2012			2011
Deferred tax assets:
Accounts receivable	$	1,111		$	1,304
Inventories		6,707			6,669
Net operating loss carryforwards		71,773			78,236
Accrued liabilities		26,997			22,061
Other assets		10,228			9,200
Gross deferred tax assets		116,816			117,470
Less valuation allowance		(56,359	)		(63,617	)
Total deferred tax assets		60,457			53,853
Deferred tax liabilities:
Property, plant and equipment		30,957			31,945
Other intangible assets		46,628			43,440
Convertible Notes		21,616			20,727
Other liabilities		2,400			4,992
Total deferred tax liabilities		101,601			101,104
Net deferred tax liabilities	$	(41,144	)	$	(47,251	)

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The Company has approximately $11,139 in United States federal net operating loss carryforwards, approximately $3,375 of which are limited by Section 382 of the Internal Revenue Code, that begin to expire in the year ending 2023. The Company has approximately $235,000 of net operating loss carryforwards at March 31, 2012 that relate to the Company’s foreign subsidiaries. Some of these net operating loss carryforwards have an unlimited life, while others expire at various times over the next 20 years. In addition, the Company also had approximately $45,559 of net operating loss carryforwards for state tax purposes that expire at various times over the next 20 years.

The Company has recorded a valuation allowance against certain federal net operating losses that are limited by Section 382. As of March 31, 2012 and 2011 these valuation allowances were $793 and $5,432, respectively. Of the decrease, $2,477 was recorded as a tax benefit primarily as a result of increasing the ownership in a domestic joint venture, and $2,162 was offset by a corresponding decrease to the net operating loss deferred tax asset due to the statutory limit on net operating loss usage pursuant to Section 382. The Company has also recorded a valuation allowance for net deferred tax assets in certain foreign and state tax jurisdictions, primarily related to net operating loss carryforwards, due to the significant losses incurred in these tax jurisdictions. As of March 31, 2012 and 2011 the valuation allowance associated with certain foreign tax jurisdictions was $53,206 and $55,738, respectively. As of March 31, 2012 and 2011 the valuation allowance associated with the state tax jurisdictions was $2,360 and $2,447, respectively. During the fiscal years ended March 31, 2012 and 2011, the Company recorded tax benefits of $2,940 and $2,498, respectively, due to the utilization of net operating loss carryforwards in certain foreign subsidiaries.

A reconciliation of income taxes at the statutory rate to the income tax provision is as follows:

	Fiscal year ended March 31,
	2012			2011			2010
United States statutory income tax expense (at 35%)	$	66,962		$	53,005		$	30,539
Increase (decrease) resulting from:
State income taxes, net of federal effect		1,592			3,035			(116	)
Nondeductible expenses, domestic manufacturing deduction and other		1,587			(1,848	)		3,799
Effect of foreign operations		(20,028	)		(14,841	)		(9,253	)
Valuation allowance		(2,821	)		(1,333	)		(18	)
Income tax expense	$	47,292		$	38,018		$	24,951

The effective income tax rate was 24.7% in fiscal 2012, compared to 25.1% in fiscal 2011 and 28.6% in fiscal 2010.

At March 31, 2012, the Company has not recorded United States income or foreign withholding taxes on approximately $494,000 of undistributed earnings of foreign subsidiaries that could be subject to taxation if remitted to the United States because the Company currently plans to keep these amounts permanently invested overseas. It is not practical to calculate the income tax expense that would result upon repatriation of these earnings.

The Company recognizes and measures uncertain tax positions taken, or expected to be taken, in a tax return in accordance with FASB guidance on accounting for uncertainty in income taxes.

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A reconciliation of the beginning and ending amount of unrecognized tax benefits under FASB guidance is as follows:

March 31, 2009	$	13,305
Increases related to current year tax positions		919
Increases related to prior year tax positions due to foreign currency translation		5
Decreases related to prior year tax position settled		(2,940	)
Lapse of statute of limitations		(539	)
March 31, 2010		10,750
Increases related to current year tax positions		2,896
Increases related to prior year tax positions		324
Increases related to prior year tax positions due to foreign currency translation		122
Decreases related to prior year tax position settled		(3,145	)
Lapse of statute of limitations		(302	)
March 31, 2011		10,645
Increases related to current year tax positions		5,032
Increases related to prior year tax positions		182
Increases related to prior year tax positions due to foreign currency translation		(28	)
Decreases related to prior year tax position settled		—
Lapse of statute of limitations		(2,886	)
March 31, 2012	$	12,945

All of the balance of unrecognized tax benefits at March 31, 2012 and 2011, if recognized, would be included in the Company’s consolidated statements of income and have a favorable impact on both the company’s statements of income and effective tax rate.

The Company and its subsidiaries file income tax returns in the U.S. federal jurisdiction, and various states and foreign jurisdictions. With few exceptions, the Company is no longer subject to U.S. federal, state and local, or non-U.S. income tax examinations by tax authorities for years before 2006.

The Company anticipates that it is reasonably possible that a portion of the March 31, 2012 balance of the unrecognized tax benefits could be recognized within the next twelve months due to the expiration of the relevant statutes of limitations. An estimate of the range of the adjustments cannot be made at this time.

The Company recognizes tax related interest and penalties in income tax expense in its consolidated statements of income. As of March 31, 2012 and 2011, the Company had an accrual of $575 and $675, respectively, for interest and penalties.

14. Retirement Plans

Defined Benefit Plans

The Company provides retirement benefits to substantially all eligible salaried and hourly employees. The Company uses a measurement date of March 31 for its pension plans.

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Net periodic pension cost for fiscal 2012, 2011, and 2010, includes the following components:

	United States Plans									International Plans
	Fiscal Year Ended March 31,									Fiscal Year Ended March 31,
	2012			2011			2010			2012			2011			2010
Service cost	$	285		$	250		$	224		$	645		$	603		$	621
Interest cost		668			646			635			2,504			2,503			2,520
Expected return on plan assets		(706	)		(624	)		(491	)		(1,787	)		(1,615	)		(1,256	)
Amortization and deferral		238			248			458			32			53			(43	)
Net periodic benefit cost	$	485		$	520		$	826		$	1,394		$	1,544		$	1,842

The following table sets forth a reconciliation of the related benefit obligation, plan assets, and accrued benefit costs related to the pension benefits provided by the Company for those employees covered by defined benefit plans:

	United States Plans						International Plans
	March 31,						March 31,
	2012			2011			2012			2011
Change in projected benefit obligation
Benefit obligation at the beginning of the period	$	11,903		$	10,992		$	48,881		$	46,851
Service cost		285			250			645			603
Interest cost		668			646			2,504			2,503
Benefits paid, inclusive of plan expenses		(615	)		(581	)		(1,709	)		(1,481	)
Plan settlements		—			—			(40	)		—
Plan amendments		—			108			—			817
Plan combinations (including newly material plans)		—			—			—			337
Experience (gain) loss		1,799			488			5,442			(3,366	)
Foreign currency translation adjustment		—			—			(1,828	)		2,617
Benefit obligation at the end of the period	$	14,040		$	11,903		$	53,895		$	48,881

	United States Plans						International Plans
	March 31,						March 31,
	2012			2011			2012			2011
Change in plan assets
Fair value of plan assets at the beginning of the period	$	8,746		$	7,859		$	25,779		$	22,712
Actual return on plan assets		420			1,102			1,555			1,751
Employer contributions		641			366			1,505			1,424
Benefits paid, inclusive of plan expenses		(615	)		(581	)		(1,709	)		(1,481	)
Plan settlements		—			—			(40	)		—
Foreign currency translation adjustments		—			—			(148	)		1,373
Fair value of plan assets at the end of the period	$	9,192		$	8,746		$	26,942		$	25,779
Funded status deficit	$	(4,848	)	$	(3,157	)	$	(26,953	)	$	(23,102	)

	March 31,
	2012			2011
Amounts recognized in the consolidated balance sheets consist of:
Other assets	$	260		$	2,513
Accrued expenses		(1,309	)		(1,369	)
Other liabilities		(30,752	)		(27,403	)
	$	(31,801	)	$	(26,259	)

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The following table represents pension components (before tax) and related changes (net of tax) recognized in AOCI for the Company’s pension plans for the years ended March 31, 2012, 2011 and 2010:

	March 31,
	2012			2011			2010
Amounts recorded in AOCI before taxes:
Prior service credit (cost)	$	(922	)	$	(1,054	)	$	(132	)
Net gain (loss)		(11,176	)		(3,712	)		(7,344	)
Net amount recognized	$	(12,098	)	$	(4,766	)	$	(7,476	)

	March 31,
	2012			2011			2010
Changes in plan assets and benefit obligations:
New prior service cost	$	—		$	905		$	—
Net loss /(gain) arising during the year		7,757			(3,505	)		753
Effect of exchange rates on amounts included in AOCI		(176	)		151			40
Amounts recognized as a component of net periodic benefit costs:
Amortization or curtailment recognition of prior service credit /(cost)		(83	)		(62	)		(142	)
Amortization or settlement recognition of net gain/(loss)		(187	)		(250	)		(333	)
Total recognized in other comprehensive income	$	7,311		$	(2,761	)	$	318

The amounts included in AOCI as of March 31, 2012 that are expected to be recognized as components of net periodic pension cost during the fiscal year ended March 31, 2013 are as follows:

Net loss	$	(81	)
Net prior service cost		(534	)
Net amount expected to be recognized	$	(615	)

The accumulated benefit obligation related to all defined benefit pension plans and information related to unfunded and underfunded defined benefit pension plans at the end of each year follows:

	United States Plans				International Plans
	March 31,				March 31,
	2012		2011		2012		2011
All defined benefit plans:
Accumulated benefit obligation	$	14,040	$	11,903	$	50,416	$	46,225
Unfunded defined benefit plans:
Projected benefit obligation		—		—		26,892		25,533
Accumulated benefit obligation		—		—		25,508		24,413
Defined benefit plans with an accumulated benefit obligation in excess of the fair value of plan assets:
Projected benefit obligation		14,040		11,903		28,003		25,560
Accumulated benefit obligation		14,040		11,903		26,445		24,440
Fair value of plan assets		9,192		8,746		789		—

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Assumptions

Significant assumptions used to determine the net periodic benefit cost for the US and International plans were as follows:

	United States Plans									International Plans
	March 31,									March 31,
	2012			2011			2010			2012			2011			2010
Discount rate		5.7	%		6.0	%		6.5	%		4.0-5.5	%		4.3-6.0	%		3.8-6.0	%
Expected return on plan assets		8.0			8.0			8.0			5.5-7.0			5.5-7.0			5.5-7.0
Rate of compensation increase		N/A			N/A			N/A			2.0-4.0			2.0-3.5			2.0-3.5

Significant assumptions used to determine the projected benefit obligations for the US and International plans were as follows:

	United States Plans						International Plans
	March 31,						March 31,
	2012			2011			2012			2011
Discount rate		4.8	%		5.7	%		2.5-5.5	%		4.0-5.5	%
Expected return on plan assets		8.0			8.0			5.5-7.0			5.5-7.0
Rate of compensation increase		N/A			N/A			2.0-4.0			2.0-4.0

N/A = not applicable

The United States plans do not include compensation in the formula for determining the pension benefit as it is based solely on years of service.

The expected long-term rate of return for the Company’s pension plan assets is based upon the target asset allocation and is determined using forward looking assumptions in the context of historical returns and volatilities for each asset class, as well as correlations among asset classes. The Company evaluates the rate of return assumptions for each of its plans on an annual basis.

Pension Plan Investment Strategy

The Company’s investment policy emphasizes a balanced approach to investing in securities of high quality and ready marketability. Investment flexibility is encouraged so as not to exclude opportunities available through a diversified investment strategy.

Equity investments are maintained within a target range of 50%-70% of the total portfolio market value. Investments in debt securities include issues of various maturities, and the average quality rating of bonds should be investment grade with a minimum quality rating of “B” at the time of purchase.

The Company periodically reviews the asset allocation of its portfolio. The proportion committed to equities, debt securities and cash and cash equivalents is a function of the values available in each category and risk considerations. The plan’s overall return will be compared to and expected to meet or exceed established benchmark funds and returns over a three to five year period.

The objectives of the Company’s investment strategies are: (a) the achievement of a reasonable long-term rate of total return consistent with an emphasis on preservation of capital and purchasing power, (b) stability of annual returns through a portfolio risk level, which is appropriate to conservative accounts, and (c) reflective of the Company’s willingness to forgo significantly above-average rewards in order to minimize above-average risks. These objectives may not be met each year but should be attained over a reasonable period of time.

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In connection with a past acquisition, the Company had assumed defined benefit plans in Germany and France. These plans have no assets, while their benefit obligations were $22,874 and $21,706 as of March 31, 2012 and 2011, respectively. Other salary and hourly employees are provided benefits in accordance with governmental regulatory requirements.

The following table represents our pension plan investments measured at fair value as of March 31, 2012 and 2011 and the basis for that measurement:

	March 31, 2012
	United States Plans								International Plans
	Total Fair Value Measurement		Quoted Price In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Fair Value Measurement		Quoted Price In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Asset Category:
Cash and Cash Equivalents	$	868	$	868	$	—	$	—	$	—	$	—	$	—	$	—
Equity Securities
US(a)		5,067		5,067		—		—		2,742		2,742		—		—
International(b)		837		837		—		—		14,728		14,728		—		—
Fixed Income(c)		2,420		2,420		—		—		9,472		9,472		—		—
Total	$	9,192	$	9,192	$	—	$	—	$	26,942	$	26,942	$	—	$	—

	March 31, 2011
	United States Plans								International Plans
	Total Fair Value Measurement		Quoted Price In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Fair Value Measurement		Quoted Price In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Asset Category:
Cash and Cash Equivalents	$	528	$	528	$	—	$	—	$	—	$	—	$	—	$	—
Equity Securities
US(a)		4,839		4,839		—		—		2,521		2,521		—		—
International(b)		840		840		—		—		13,600		13,600		—		—
Fixed Income(c)		2,539		2,539		—		—		9,658		9,658		—		—
Total	$	8,746	$	8,746	$	—	$	—	$	25,779	$	25,779	$	—	$	—

The fair values presented above were determined based on valuation techniques categorized as follows:

• Level one: The use of unadjusted quoted prices in active markets for identical instruments.

• Level two: The use of quoted prices for similar instruments in active markets or quoted prices for identical or similar instruments in markets that are not active or other inputs that are observable in the market or can be corroborated by observable market data.

• Level three: The use of significant unobservable inputs and that typically require the use of management’s estimates of assumptions that market participants would use in pricing.

(a) US equities include companies that are well diversified by industry sector and equity style (i.e., growth and value strategies). Active and passive management strategies are employed. Investments are primarily in large capitalization stocks and, to a lesser extent, mid- and small-cap stocks.

(b) International equities are invested in companies that are traded on exchanges outside the U.S. and are well diversified by industry sector, country and equity style. Active and passive strategies are

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employed. The vast majority of the investments are made in companies in developed markets with a small percentage in emerging markets.

(c) Fixed income consists primarily of investment grade bonds from diversified industries.

The Company expects to make cash contributions of approximately $2,571 to its pension plans in fiscal year 2013.

Estimated future benefit payments under the Company’s pension plans are as follows:

	Pension Benefits
2013	$	2,173
2014		2,319
2015		2,445
2016		2,674
2017		2,993
Years 2018-2022		17,281

Defined Contribution Plan

Effective January 1, 2004, the Company amended its Defined Contribution Plan (the “401(k) Plan”). The amended 401(k) Plan covers substantially all U.S. salaried and hourly employees except those covered by a union plan. All eligible employees of the amended 401(k) Plan receive a matching contribution of 100% of the first 4% of wages contributed and 50% of the next 2% of wages contributed for a total match of up to 5% by the Company.

Effective February 1, 2009, the Company amended the EnerSys United Kingdom Pension Scheme (“Amended U.K. Plan”) that covers substantially all United Kingdom employees, both direct and salaried so that all members with defined benefit plan benefits at that date would be provided with defined contribution plan benefits for future service. The Company pays contributions to fund any accrued liabilities in excess of the assets in the defined benefit section of the Amended U.K. Plan as necessary. Active members of the Amended U.K. Plan as of February 1, 2009 receive a matching contribution from the Company up to 4% of Pensionable Salary and an enhanced Company contribution in excess of this in line with the rules of the plan. New eligible employees of the Amended U.K. Plan receive a matching contribution from the Company up to 5% of pensionable salary, at various rates as provided by the plan.

Employer expenses for the 401(k) plan and the Amended U.K. Plan for the fiscal years ended March 31, 2012, 2011 and 2010 were $5,146, $5,025 and $3,909, respectively.

15. Stockholders’ Equity

Preferred Stock and Common Stock

The Company’s certificate of incorporation authorizes the issuance of up to 1,000,000 shares of preferred stock, par value $0.01 per share (“Preferred Stock”). At March 31, 2012 and 2011, no shares of Preferred Stock were issued or outstanding. The Board of Directors of the Company has the authority to specify the terms of any Preferred Stock at the time of issuance.

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The following demonstrates the change in the number of shares of common stock outstanding during fiscal 2012:

Shares outstanding as of March 31, 2011	50,034,353
Repurchase of common shares	(2,646,885	)
Shares issued as part of equity-based compensation plans, net of equity awards surrendered for option price and taxes	412,661
Shares outstanding as of March 31, 2012	47,800,129

Treasury Stock

In fiscal 2012, the Company purchased 2,646,885 shares of its common stock for $58,383 from institutional shareholders and recorded the same as treasury stock. Treasury stock as of March 31, 2012 and 2011 was $78,183 and $19,800, respectively.

Accumulated Other Comprehensive Income

The components of accumulated other comprehensive income are as follows:

	Beginning Balance			Before-Tax Amount			Tax Benefit (Expense)			Net-of-Tax Amount			Ending Balance
March 31, 2012
Pension funded status adjustment	$	(3,512	)	$	(7,311	)	$	1,841		$	(5,470	)	$	(8,982	)
Unrealized gain (loss) on derivative instruments		4,436			(5,170	)		1,909			(3,261	)		1,175
Foreign currency translation adjustment		114,256			(32,356	)		—			(32,356	)		81,900
Accumulated other comprehensive income	$	115,180		$	(44,837	)	$	3,750		$	(41,087	)	$	74,093
March 31, 2011
Pension funded status adjustment	$	(5,479	)	$	2,761		$	(794	)	$	1,967		$	(3,512	)
Unrealized gain (loss) on derivative instruments		(5,034	)		14,721			(5,251	)		9,470			4,436
Foreign currency translation adjustment		77,717			36,539			—			36,539			114,256
Accumulated other comprehensive income	$	67,204		$	54,021		$	(6,045	)	$	47,976		$	115,180
March 31, 2010
Pension funded status adjustment	$	(4,794	)	$	(318	)	$	(367	)	$	(685	)	$	(5,479	)
Unrealized gain (loss) on derivative instruments		(7,660	)		4,047			(1,421	)		2,626			(5,034	)
Foreign currency translation adjustment		46,509			31,208			—			31,208			77,717
Accumulated other comprehensive income	$	34,055		$	34,937		$	(1,788	)	$	33,149		$	67,204

16. Secondary Offerings of Common Shares

In fiscal 2011 and 2010, certain of the Company’s stockholders sold 2,845,869 and 3,200,000 shares of the Company’s common stock pursuant to an effective shelf registration statement filed with the Securities and Exchange Commission on May 19, 2008.

The offered shares were sold by those stockholders of the Company, including affiliates of Metalmark Capital LLC and certain other institutional stockholders. The Company did not receive any proceeds from the common stock offerings; however, under the terms of its securityholder agreement, the Company did incur fees related to the offerings in fiscal 2011 and fiscal 2010 of $615 and $150, respectively.

There were no secondary offerings in fiscal 2012.

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17. Stock-Based Compensation

As of March 31, 2012, the Company maintains the EnerSys 2010 Equity Incentive Plan (“2010 EIP”). The 2010 EIP reserves 3,177,477 shares of common stock for the grant of various classes of nonqualified stock options, restricted stock units, market share units and other forms of equity-based compensation. Shares subject to any awards that expire without being exercised or that are forfeited or settled in cash shall again be available for future grants of awards under the 2010 EIP. Shares subject to awards that have been retained by the Company in payment or satisfaction of the exercise price and any applicable tax withholding obligation of an award shall not count against the limit described above, and only the number of shares delivered in the settlement of stock appreciation rights shall count against the limit.

At March 31, 2012, 2,872,490 shares are available for future grants. The Company’s management equity incentive plans are intended to provide an incentive to employees and non-employee directors of the Company to remain in the service of the Company and to increase their interest in the success of the Company in order to promote the long-term interests of the Company. The plans seek to promote the highest level of performance by providing an economic interest in the long-term performance of the Company. The Company settles employee share-based compensation awards with newly issued shares.

Stock Options

Non-qualified stock options have been granted to employees under the equity incentive plans at prices not less than the fair market value of the shares on the dates the options were granted. Options issued in fiscal 2010 vest over a three-year or six-month period. Options become exercisable in equal installments over the vesting period. No non-qualified stock options were granted in fiscal 2012 or 2011. Options generally expire in 10 years, however options vesting in six months expire in 3 1/2 years.

The weighted average fair value of options granted in fiscal 2010 were $8.35 and $5.15, and were determined using the following assumptions:

	2010			2010
	10 Year Options			3.5 Year Options
Exercise price	$	16.20		$	16.24
Risk-free interest rate		2.01	%		0.93	%
Dividend yield		0	%		0	%
Expected life		5years			2years
Expected volatility		56.6	%		56.6	%
Weighted average fair value	$	8.35		$	5.15

For fiscal 2012, 2011 and 2010, the Company recognized $1,092 ($822 net of taxes), $2,333 ($1,844 net of taxes) and $2,993 ($2,095 net of taxes), respectively, of stock-based compensation expense associated with the stock option grants.

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The following table summarizes the Company’s stock option activity in the years indicated:

	Number of Options			Weighted Average Remaining Contract Term (Years)		Weighted Average Exercise Price		Aggregate Intrinsic Value
Options outstanding as of March 31, 2009		2,643,175			4.2	$	16.70	$	1,752
Granted		539,506					16.21		—
Exercised		(667,862	)				12.22		7,125
Canceled		(83,586	)				21.43		522
Options outstanding as of March 31, 2010		2,431,233			4.0	$	17.69	$	19,191
Exercised		(1,415,391	)				15.34		18,482
Canceled		(155,063	)				29.32		9
Options outstanding as of March 31, 2011		860,779			6.2	$	19.52	$	17,129
Exercised		(227,116	)				15.82		3,691
Options outstanding as of March 31, 2012		633,663			6.1	$	20.85	$	8,879
Options exercisable as of March 31, 2012		523,626			5.9	$	21.82	$	6,826
Options expected to vest after March 31, 2012		110,037			7.1	$	16.20	$	2,053

The following table summarizes information regarding stock options outstanding and exercisable at March 31, 2012:

	Options Outstanding						Options Exercisable
Range of Exercise Prices	Number of Options		Weighted Average Remaining Contractual Life		Weighted Average Exercise Price		Number of Options		Weighted Average Exercise Price
$10.01-15.00		65,954		3.1	$	14.12		65,954	$	14.12
$15.01-20.00		361,661		6.6		16.75		251,624		16.99
Over $20.00		206,048		6.1		30.19		206,048		30.19
		633,663		6.1	$	20.85		523,626	$	21.82

A summary of the status of the Company’s non-vested options as of March 31, 2012, and changes during the year ended March 31, 2012, is presented below:

	Number of Options			Weighted Average Grant-Date Fair Value
Nonvested at March 31, 2011		357,903		$	8.70
Vested		(247,866	)		9.06
Nonvested at March 31, 2012		110,037		$	7.87

Restricted Stock Units and Market Share Units

In fiscal 2012, the Company granted to non-employee directors 35,632 deferred restricted stock units at the market price of $22.45 per restricted stock unit at the date of grant. The fiscal 2012 non-employee director awards vested immediately upon the date of grant and the payment of shares of common stock under this grant are payable upon such director’s termination of service as a director. In fiscal 2011, the Company granted to non-employee directors 21,248 restricted stock units at the market price of $22.59 per restricted stock unit at the date of grant. The fiscal 2011 non-employee director awards vested thirteen months following the date of grant.

In fiscal 2012, the Company granted to management and other key employees 95,026 restricted stock units at the market price on that date of $35.79 per share and 224,397 market share units at the fair market value on that date of $48.36 per share. Restricted stock units are granted at the market price of the Company’s common

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stock on the date of grant and vest and are settled in common stock 25% per year over a four-year period from the date of grant. Also, in fiscal 2012, the Company granted 9,340 restricted stock units, at various fair values, under deferred compensation plans.

Market share units are granted at fair value on the date of grant and vest and are settled in common stock on the third anniversary of the date of grant. Market share units are converted into between zero and two shares of common stock for each unit granted at the end of a three-year performance cycle. The conversion ratio is calculated by dividing the average closing share price of the Company’s common stock during the ninety calendar days immediately preceding the vesting date by the average closing share price of the Company’s common stock during the ninety calendar days immediately preceding the grant date, with the resulting quotient capped at two. This quotient is then multiplied by the number of market share units granted to yield the number of shares of common stock to be delivered on the vesting date. The fair value of the market share units granted in fiscal 2012 was estimated at the date of grant using a binomial lattice model with the following assumptions: a risk-free interest rate of 0.93%, dividend yield of zero, time to maturity of 3 years and expected volatility of 45.5%.

In fiscal 2011, the Company granted to management and other key employees 291,701 restricted stock units at the market price on that date of $25.67 per share and 124,091 market share units at the fair market value on that date of $34.45 per share. These restricted stock units are granted at the fair market value of the Company’s common stock on the date of grant and vest 25% per year over a four-year period from the date of grant. The fair value of the market share units granted in fiscal 2011 was estimated at the date of grant using a binomial lattice model with the following assumptions: a risk-free interest rate of 1.30%, dividend yield of zero, time to maturity of 3 years and expected volatility of 43.0%.

A summary of the changes in restricted stock units and market share units awarded to employees and directors that were outstanding under the Company’s equity compensation plans during fiscal 2012 is presented below:

	Restricted Stock Units (RSU) / Market Share Units (MSU)
	Number of RSU and MSU			Weighted Average Grant Date Fair Value
Non-vested awards as of March 31, 2011		865,392		$	23.97
Granted		364,395			40.76
Vested		(259,151	)		22.28
Canceled		(6,833	)		11.49
Non-vested awards as of March 31, 2012		963,803		$	30.84

The Company recognized equity-based compensation expense related to the vesting of restricted stock units and market share units of approximately $10,493, with a related tax benefit of $2,599 for fiscal 2012, $6,723, with a related tax benefit of $1,659 for fiscal 2011 and $3,968, with a related tax benefit of $1,190 for fiscal 2010.

All Award Plans

As of March 31, 2012, unrecognized compensation expense associated with the non-vested incentive awards outstanding was $18,451 and is expected to be recognized over a weighted average period of nineteen months.

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18. Earnings Per Share

The following table sets forth the reconciliation from basic to diluted average common shares and the calculations of net earnings per common share.

	March 31,
	2012		2011		2010
Net earnings attributable to EnerSys stockholders	$	144,003	$	113,426	$	62,304
Average common shares:
Basic (weighted-average outstanding shares)		48,748,205		49,376,132		48,122,207
Dilutive potential common shares from exercise and lapse of equity awards, net of shares assumed reacquired		467,830		668,114		711,888
Diluted (weighted-average outstanding shares)		49,216,035		50,044,246		48,834,095
Basic earnings per common share attributable to EnerSys stockholders	$	2.95	$	2.30	$	1.29
Diluted earnings per common share attributable to EnerSys stockholders	$	2.93	$	2.27	$	1.28
Anti-dilutive equity awards not included in weighted average common shares—diluted		221,097		—		383,696

The aggregate number of shares that the Company could be obligated to issue upon conversion of its $172,500 Convertible Notes which the Company issued in May 2008, is approximately 4,248,761. It is the Company’s current intent to settle the principal amount of any conversions in cash, and any additional conversion consideration in cash, shares of EnerSys common stock or a combination of cash and shares. No contingent shares were included in diluted shares outstanding during fiscal 2012, 2011 and 2010, as the specified conversion price exceeded the average market price of the Company’s common stock, and the inclusion of contingent shares would have been anti-dilutive.

19. Commitments, Contingencies and Litigation

Litigation and Other Legal Matters

The Company is involved in litigation incidental to the conduct of its business, the results of which, in the opinion of management, are not likely to be material to the Company’s financial condition, results of operations, or cash flows.

In fiscal 2009, the Court of Commerce in Lyon, France ruled that the Company’s French subsidiary, EnerSys Sarl, which was acquired by the Company in 2002, was partially responsible for a 1999 fire in a French hotel under construction. The Company’s portion of damages was assessed at €2,700 or $4,200 which was duly recorded and paid by the Company, but the ruling was appealed. In a subsequent ruling by the Court of Appeal of Lyon, France, the portion of damages was reduced, entitling the Company to a refund of the monies paid of €671 or $900 which has been recorded and collected in the second quarter of fiscal 2012. The Company further appealed the ruling to the French Supreme Court, which on March 14, 2012, ruled in the Company’s favor and ordered the case back to the Court of Appeal of Lyon to further review certain aspects of the original decision in the case, including the assessment of damages.

Environmental Issues

As a result of its operations, the Company is subject to various federal, state and local, as well as international environmental laws and regulations and is exposed to the costs and risks of registering, handling, processing, storing, transporting, and disposing of hazardous substances, especially lead and acid. The

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Company’s operations are also subject to federal, state, local and international occupational safety and health regulations, including laws and regulations relating to exposure to lead in the workplace.

The Company is responsible for certain cleanup obligations at the former Yuasa battery facility in Sumter, South Carolina that predates its ownership of this facility. This manufacturing facility was closed in 2001 and is separate from the Company’s current metal fabrication facility in Sumter. The Company has established a reserve for this facility. As of March 31, 2012 and 2011, the reserves related to this facility totaled $2,995 and $3,279, respectively. Based on current information, the Company’s management believes these reserves are adequate to satisfy the Company’s environmental liabilities at this facility.

In September 2011, the Company’s facility in Jiangsu Province, China, was closed by government authorities for an environmental review. After completion of the review, the government authorities allowed the plant to reopen in November 2011 on a conditional basis, with the understanding that the Company would work with the assistance of the government agencies, to relocate to a more preferable location.

Collective Bargaining

At March 31, 2012, the Company had approximately 9,200 employees. Of these employees, approximately 40% were covered by collective bargaining agreements. The average term of these agreements is two years, with the longest term being four years. These agreements expire over the period from calendar years 2012 to 2014.

Lead Contracts

To stabilize its costs, the Company has entered into contracts with financial institutions to fix the price of lead. The vast majority of such contracts are for a period not extending beyond one year. Under these contracts, at March 31, 2012 and 2011, the Company hedged the price to purchase approximately 60.0 million and 63.4 million pounds of lead, respectively, for a total purchase price of $56,610 and $68,212, respectively.

Foreign Currency Forward Contracts

The Company quantifies and monitors its global foreign currency exposures. On a selective basis the Company will enter into foreign currency forward and option contracts to reduce the volatility from currency movements that affect the Company. The maturity period of these contracts is less than one year. The Company’s largest exposure is from the purchase and conversion of U.S. dollar based lead costs into local currencies in Europe. Additionally, the Company has currency exposures from intercompany and third party trade transactions. To hedge these exposures, the Company has entered into a total of $53,531 and $82,829, respectively, of foreign currency forward contracts with financial institutions as of March 31, 2012 and 2011.

Interest Rate Swap Agreements

The Company is exposed to changes in variable U.S. interest rates on borrowings under its credit agreements. On a selective basis, from time to time, the Company enters into interest rate swap agreements to reduce the negative impact that increases in interest rates could have on its outstanding variable rate debt. At March 31, 2012 and March 31, 2011, such agreements, which expire between February 2013 and May 2013, converted $85,000 of variable-rate debt to a fixed-rate basis, utilizing the three-month LIBOR, as a floating rate reference. Fluctuations in LIBOR and fixed rates affect both the Company’s net financial investment position and the amount of cash to be paid or received under these agreements.

20. Restructuring Plans

The Company has acquisition related restructuring plans and non-acquisition related restructuring plans and bases its restructuring accounting and disclosures on the applicable accounting guidance. As a result, charges to net earnings were made in the periods in which restructuring plan liabilities were incurred.

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Acquisition related restructuring plan

In fiscal 2010, the Company acquired the stock of OEB Traction Batteries and certain operating assets and liabilities of the reserve power battery business of Accu Holding AG and its Swedish sales subsidiary (all collectively referred to as “Oerlikon”). The Company completed the process of closing the two manufacturing facilities of Oerlikon during the third quarter of fiscal 2011, which resulted in the reduction of approximately 100 employees. The Company recorded restructuring charges related to this plan of $4,526 in fiscal 2010 through fiscal 2012. This plan has been completed as of March 31, 2012.

A roll-forward of the acquisition related restructuring reserve is as follows:

	Employee Severance			Plant Closure and Other			Total
Balance at March 31, 2009	$	—		$	—		$	—
Accrued		1,269			—			1,269
Costs incurred		—			—			—
Foreign currency impact and other		23			—			23
Balance at March 31, 2010	$	1,292		$	—		$	1,292
Accrued		108			2,438			2,546
Costs incurred		(1,107	)		(2,313	)		(3,420	)
Foreign currency impact and other		(36	)		21			(15	)
Balance at March 31, 2011	$	257		$	146		$	403
Accrued		81			630			711
Costs incurred		(338	)		(776	)		(1,114	)
Balance at March 31, 2012	$	—		$	—		$	—

Non-acquisition related restructuring plans

In February and May 2009, the Company announced a plan to restructure certain of its European and American operations, which resulted in a reduction of approximately 470 employees upon completion across its operations. These actions were primarily in Europe and included charges for employee-related severance payments and asset impairments, the most significant of which was the closure of its leased Italian manufacturing facility and the opening of a new Italian distribution center. The Company recorded restructuring charges of $31,894 in fiscal 2009 through fiscal 2011, with $105 of additional charges offset by a favorable accrual adjustment of $246 during fiscal 2012. The Company incurred $2,270 of costs against the accrual during fiscal 2012. This plan has been completed as of March 31, 2012.

During fiscal 2011, the Company announced a further restructuring of its European operations, which will result in the reduction of approximately 60 employees upon completion across its operations. The Company estimates that the total charges for these actions will amount to approximately $5,200, primarily from cash expenses for employee severance-related payments and site closure costs. Based on commitments incurred to date, the Company recorded restructuring charges of $3,830 in fiscal 2011, with $1,783 of additional charges, offset by a favorable accrual adjustment of $435 related to the fiscal 2011 plan recorded in fiscal 2012. The Company incurred $1,316 of costs against the accrual during fiscal 2011, with an additional $3,263 of costs incurred during fiscal 2012. As of March 31, 2012, the reserve balance associated with these actions is $556. The Company does not expect to be committed to significant additional restructuring charges in fiscal 2013 related to these actions.

During fiscal 2012, the Company announced restructuring plans related to its operations in Europe, primarily consisting of the transfer of manufacturing of select products between certain of its manufacturing operations and restructuring of its selling, general and administrative operations, which is expected to result in the reduction of approximately 80 employees upon completion. The Company estimates that the total charges for

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these actions will amount to approximately $4,200, primarily from cash expenses for employee severance-related payments. During fiscal 2012, the Company recorded restructuring charges of $3,070 and incurred $2,433 of costs against the accrual. As of March 31, 2012, the reserve balance associated with these actions is $630. The Company expects to be committed to an additional $1,100 of restructuring charges in fiscal 2013 related to these actions.

A roll-forward of the non-acquisition related restructuring reserve is as follows:

	Employee Severance			Plant Closure and Other			Total
Balance at March 31, 2009	$	10,289		$	—		$	10,289
Accrued		10,107			2,263			12,370
Costs incurred		(13,276	)		(2,263	)		(15,539	)
Foreign currency impact and other		362			—			362
Balance at March 31, 2010	$	7,482		$	—		$	7,482
Accrued		4,267			—			4,267
Costs incurred		(6,945	)		—			(6,945	)
Foreign currency impact and other		116			—			116
Balance at March 31, 2011	$	4,920		$	—		$	4,920
Accrual adjustment		(681	)		—			(681	)
Accrued		4,958			—			4,958
Costs incurred		(7,966	)		—			(7,966	)
Foreign currency impact and other		(45	)		—			(45	)
Balance at March 31, 2012	$	1,186		$	—		$	1,186

21. Warranty

The Company provides for estimated product warranty expenses when the related products are sold and are included within accrued expenses and other liabilities. Because warranty estimates are forecasts that are based on the best available information, primarily historical claims experience, claims costs may differ from amounts provided. An analysis of changes in the liability for product warranties is as follows:

Balance at March 31, 2009	$	30,914
Current year provisions		13,123
Costs incurred		(13,283	)
Foreign exchange and other		985
Balance at March 31, 2010	$	31,739
Current year provisions		20,565
Costs incurred		(17,499	)
Foreign exchange and other		1,201
Balance at March 31, 2011	$	36,006
Current year provisions		26,841
Costs incurred		(20,185	)
Foreign exchange and other		(595	)
Balance at March 31, 2012	$	42,067

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22. Other (Income) Expense, Net and Charges Related to Refinancing

Other (income) expense, net consists of the following:

	Fiscal Years Ended March 31,
	2012		2011		2010
Foreign exchange transaction losses	$	1,483	$	732	$	3,045
Secondary offering fees		—		615		150
Other		1,585		830		1,189
Total	$	3,068	$	2,177	$	4,384

Charges related to refinancing:

	Fiscal Years Ended March 31,
	2012		2011		2010
Charges related to refinancing	$	—	$	8,155	$	—

In fiscal 2011, the Company incurred charges of $8,155 in connection with the refinancing of the Company’s previous credit facility. These charges included $2,308 in write offs of deferred financing fees and $5,847 of losses from discontinuing hedge accounting for the interest rate swap agreements.

23. Operations by Industry Segment and Geographic Area

The Company has three reportable business segments based on geographic regions, defined as follows:

• Americas, which includes North and South America, with segment headquarters in Reading, Pennsylvania, USA,

• Europe, which includes Europe, the Middle East and Africa, with segment headquarters in Zurich, Switzerland, and

• Asia, which includes Asia, Australia and Oceania, with segment headquarters in Singapore.

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Summarized financial information related to the Company’s business segments at March 31, 2012, 2011 and 2010 and for each of the fiscal years then ended is shown below.

	Fiscal Years Ended March 31,
	2012			2011			2010
Net sales by segment to unaffiliated customers
Europe	$	995,431		$	890,313		$	741,975
Americas		1,082,747			896,629			700,297
Asia		205,191			177,520			137,113
Total net sales	$	2,283,369		$	1,964,462		$	1,579,385
Net sales by product line
Reserve power	$	1,092,734		$	970,480		$	820,526
Motive power		1,190,635			993,982			758,859
Total net sales	$	2,283,369		$	1,964,462		$	1,579,385
Intersegment sales
Europe	$	75,652		$	55,586		$	37,449
Americas		38,115			42,141			24,848
Asia		21,182			21,349			13,237
Total intersegment sales(1)	$	134,949		$	119,076		$	75,534
Operating earnings
Europe	$	63,872		$	55,643		$	17,649
Americas		138,894			124,515			87,156
Asia		12,133			10,469			20,502
Legal proceedings settlement income (Europe)		900			—			—
Restructuring charges (Europe)		(4,988	)		(6,813	)		(13,212	)
Restructuring charges (Americas)		—			—			(717	)
Bargain purchase gain (Europe)		—			—			2,919
Total operating earnings(2)	$	210,811		$	183,814		$	114,297
Property, plant and equipment, net
Europe	$	161,854		$	169,056		$	156,953
Americas		144,701			142,263			138,217
Asia		46,660			33,066			19,971
Total	$	353,215		$	344,385		$	315,141
Capital Expenditures
Europe	$	21,631		$	22,034		$	20,624
Americas		20,862			22,368			21,089
Asia		6,450			15,538			3,398
Total	$	48,943		$	59,940		$	45,111
Depreciation and Amortization
Europe	$	25,451		$	21,564		$	22,348
Americas		21,466			19,842			19,189
Asia		3,443			2,987			3,314
Total	$	50,360		$	44,393		$	44,851

(1) Intersegment sales are presented on a cost plus basis which takes into consideration the effect of transfer prices between legal entities.

(2) The Company does not allocate interest expense or other (income) expense to the reportable segments.

The Company markets its products and services in over 100 countries. Sales are attributed to countries based on the location of sale approval and acceptance. Sales to customers in the United States were 42.6%, 41.3% and 40.4% for fiscal years ended March 31, 2012, 2011 and 2010, respectively. No single country, outside the United States, exceeded 10% of consolidated net sales, and therefore deemed not material for separate disclosure.

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24. Quarterly Financial Data (Unaudited)

The Company reports interim financial information for 13-week periods, except for the first quarter, which always begins on April 1, and the fourth quarter, which always ends on March 31. The four quarters in fiscal 2012 ended on July 3, 2011, October 2, 2011, January 1, 2012, and March 31, 2012, respectively. The four quarters in fiscal 2011 ended on July 4, 2010, October 3, 2010, January 2, 2011, and March 31, 2011, respectively.

	1st Quarter		2nd Quarter		3rd Quarter		4th Quarter		Fiscal Year
Fiscal year ended March 31, 2012
Net sales	$	569,229	$	547,140	$	574,246	$	592,754	$	2,283,369
Gross profit		121,971		114,395		130,876		145,463		512,705
Operating earnings(1)		48,715		42,440		53,777		65,879		210,811
Net earnings		33,496		28,289		36,859		45,323		143,967
Net earnings attributable to EnerSys stockholders		33,496		28,289		36,859		45,359		144,003
Net earnings per common share attributable to EnerSys stockholders—basic	$	0.67	$	0.57	$	0.77	$	0.95	$	2.95
Net earnings per common share attributable to EnerSys stockholders—diluted	$	0.66	$	0.57	$	0.77	$	0.94	$	2.93
Fiscal year ended March 31, 2011
Net sales	$	434,969	$	472,843	$	508,596	$	548,054	$	1,964,462
Gross profit		96,614		110,721		117,900		124,609		449,844
Operating earnings(2)		37,480		44,496		48,320		53,518		183,814
Net earnings(3)		23,027		26,549		33,759		30,091		113,426
Net earnings attributable to EnerSys stockholders		23,027		26,549		33,759		30,091		113,426
Net earnings per common share attributable to EnerSys stockholders—basic	$	0.47	$	0.54	$	0.68	$	0.60	$	2.30
Net earnings per common share attributable to EnerSys stockholders—diluted	$	0.47	$	0.53	$	0.67	$	0.59	$	2.27

(1) Included in Operating earnings were restructuring charges of $410, $902, $1,440 and $2,236 for the first, second, third and fourth quarters of fiscal 2012, respectively. Operating earnings also included a legal proceedings settlement income of $900, in the second quarter of fiscal 2012.

(2) Included in Operating earnings were restructuring charges of $723, $2,750, $1,754 and $1,586 for the first, second, third and fourth quarters of fiscal 2011, respectively.

(3) Included in Net earnings of fiscal 2011 were charges related to refinancing of $8,155 in the fourth quarter of fiscal 2011.

25. Subsequent Events

On May 14, 2012, under the Company’s 2010 Equity Incentive Plan, the Company granted 223,224 restricted stock units, which vest 25% each year over four years from the date of grant, and 292,123 market share units, which vest three years from the date of grant.

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SCHEDULE II

EnerSys

Valuation and Qualifying Accounts

(In Thousands)

	Balance at Beginning of Period		Additions Charged to Expense		Charge-Offs			Purchase accounting adjustments		Other(1)			Balance at End  of Period
Allowance for doubtful accounts:
Fiscal year ended March 31, 2010	$	7,978	$	2,712	$	(1,257	)	$	—	$	446		$	9,879
Fiscal year ended March 31, 2011		9,879		1,513		(1,673	)		—		828			10,547
Fiscal year ended March 31, 2012		10,547		1,395		(2,012	)		—		92			10,022
Allowance for inventory valuation:
Fiscal year ended March 31, 2010	$	16,725	$	1,704	$	(7,437	)	$	—	$	686		$	11,678
Fiscal year ended March 31, 2011		11,678		8,329		(5,361	)		—		406			15,052
Fiscal year ended March 31, 2012		15,052		7,659		(7,657	)		—		(223	)		14,831
Deferred tax asset—valuation allowance:
Fiscal year ended March 31, 2010	$	57,397	$	894	$	(2,896	)	$	—	$	2,987		$	58,382
Fiscal year ended March 31, 2011		58,382		825		(2,444	)		5,340		1,514			63,617
Fiscal year ended March 31, 2012		63,617		2,457		(7,528	)		1,124		(3,311	)		56,359

(1) Primarily the impact of currency changes.

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ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE

None.

ITEM 9A. CONTROLS AND PROCEDURES

(a) Disclosure Controls and Procedures. The Company’s management, with the participation of the Company’s Chief Executive Officer and Chief Financial Officer, has evaluated the effectiveness of the Company’s disclosure controls and procedures (as such term is defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) as of the end of the period covered by this report. Based on such evaluation, the Company’s Chief Executive Officer and Chief Financial Officer have concluded that, as of the end of such period, the Company’s disclosure controls and procedures are effective.

(b) Internal Control Over Financial Reporting. There have not been any changes in the Company’s internal control over financial reporting (as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) during the fourth quarter of the fiscal year to which this report relates that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

The report called for by Item 308(a) of Regulation S-K is included herein as “Management’s Report on Internal Control Over Financial Reporting.”

Management Report on Internal Control over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting. With the participation of the Chief Executive Officer and Chief Financial Officer, our management conducted an evaluation of the effectiveness of our internal control over financial reporting based on the framework and criteria established in Internal Control—Integrated Framework, issued by the Committee of Sponsoring Organizations of the Treadway Commission. The scope of management’s assessment of the effectiveness of internal control over financial reporting includes substantially all of our businesses. Based on this evaluation, our management has concluded that our internal control over financial reporting was effective as of March 31, 2012.

The attestation report called for by Item 308(b) of Registration S-K is included herein as “Report of Independent Registered Public Accounting Firm,” which appears in Item 8 in this Annual Report on Form 10-K.

/s/    JOHN D. CRAIG	/s/    MICHAEL J. SCHMIDTLEIN
John D. Craig Chairman, President and CEO	Michael J. Schmidtlein Senior Vice President, Finance and CFO

ITEM 9B. OTHER INFORMATION

Not applicable.

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PART III

ITEM 10. DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

The information required by this item is incorporated by reference from the sections entitled “Board of Directors,” “Executive Officers,” “Section 16(a) Beneficial Ownership Reporting Compliance,” “Corporate Governance—Independence of Directors,” “Corporate Governance—Process for Selection of Director Nominee Candidates,” “Audit Committee Report,” and “Certain Relationships and Related Transactions—Employment of Related Parties” of the Company’s definitive proxy statement for its 2012 Annual Meeting of Stockholders (the “Proxy Statement”) to be filed no later than 120 days after the fiscal year end.

We have adopted a Code of Business Conduct and Ethics that applies to all of our officers, directors and employees (including our Chief Executive Officer, Chief Financial Officer, and Controller) and have posted the Code on our website at www.enersys.com, and a copy is available in print to any stockholder who requires a copy. If we waive any provision of the Code applicable to any director, our Chief Executive Officer, Chief Financial Officer, and Controller, such waiver will be promptly disclosed to the Company’s stockholders through the Company’s website.

ITEM 11. EXECUTIVE COMPENSATION

The information required by this item is incorporated by reference from the sections entitled “Corporate Governance—Compensation Committee” and “Executive Compensation” of the Proxy Statement.

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT RELATED STOCKHOLDER MATTERS

The information required by this item is incorporated by reference from the section entitled “Security Ownership of Certain Beneficial Owners and Management” of the Proxy Statement.

	Equity Compensation Plan Information
Plan Category	Number of securities to be issued upon exercise of outstanding options, warrants and rights (a)			Weighted-average exercise price of outstanding options, warrants and rights (b)			Number of securities remaining available for future issuance under equity compensation plans (excluding securities reflected in column (a)) (c)
Equity compensation plans approved by security holders		1,944,029	(1)	$	20.85	(2)		2,525,927
Equity compensation plans not approved by security holders		—			—			—
Total		1,944,029		$	20.85			2,525,927

(1) Assumes a 200% payout of market share units.

(2) Awards of restricted stock units, market share units and deferred stock units and stock units held in both the EnerSys Voluntary Deferred Compensation Plan for Non-Employee Directors and the EnerSys Voluntary Deferred Compensation Plan for Executives were not included in calculating the weighted-average exercise price as they will be settled in shares of common stock for no consideration.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE

The information required by this item is incorporated by reference from the sections entitled “Corporate Governance,” and “Certain Relationships and Related Transactions” of the Proxy Statement.

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ITEM 14. PRINCIPAL ACCOUNTING FEES AND SERVICES

The information required by this item is incorporated by reference from the section entitled “Audit Committee Report” of the Proxy Statement to be filed no later than 120 days after the fiscal year end.

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PART IV

ITEM 15. EXHIBITS, FINANCIAL STATEMENT SCHEDULES

(a) The following documents are filed as part of this Report:

(1) Consolidated Financial Statements

See Index to Consolidated Financial Statements.

(2) Financial Statement Schedule

The following consolidated financial statement schedule should be read in conjunction with the consolidated financial statements (see Item 8. “Financial Statements and Supplementary Data:”): Schedule II—Valuation and Qualifying Accounts.

All other schedules are omitted because they are not applicable or the required information is contained in the consolidated financial statements or notes thereto.

(b) The following documents are filed herewith as exhibits:

Exhibit Number	Description of Exhibit
3.1	Fifth Restated Certificate of Incorporation (incorporated by reference to Exhibit 3.1 to Amendment No. 3 to EnerSys’ Registration Statement on Form S-1 (File No. 333-115553) filed on July 13, 2004).
3.2	Bylaws (incorporated by reference to Exhibits 3.2 to Amendment No. 3 to EnerSys’ Registration Statement on Form S-1 (File No. 333-115553) filed on July 13, 2004).
4.1	Indenture, dated as of May 28, 2008, between EnerSys and The Bank of New York, as trustee (incorporated by reference to Exhibit 4.1 to EnerSys’ Current Report on Form 8-K (File No. 001-32253) filed on May 28, 2008).
4.2	First Supplemental Indenture, dated as of May 28, 2008, between EnerSys and The Bank of New York, as trustee (incorporated by reference to Exhibit 4.2 to EnerSys’ Current Report on Form 8-K (File No. 001-32253) filed on May 28, 2008).
10.1	Credit Agreement, dated as of June 27, 2008, among EnerSys, Bank of America, N.A., as Administrative Agent, Wachovia Capital Markets, LLC, as Syndication Agent, Goldman Sachs Credit Partners L.P., RZB Finance LLC and PNC Bank, National Association, as Co-Documentation Agent, and the various lending institutions party thereto (incorporated by reference to Exhibit 10.1 to EnerSys’ Current Report on Form 8-K (File No. 001-32253) filed on June 30, 2008).
10.2	Credit Agreement, dated as of March 29, 2011, among EnerSys, Bank of America, N.A., as Administrative Agent, Wells Fargo Bank, National Association, as Syndication Agent, RB International Finance (USA) LLC and PNC Bank, National Association, as Co-Documentation Agents and Co-Managers and the various lending institutions party thereto (incorporated by reference to Exhibit 10.1 to EnerSys’ Current Report on Form 8-K (File No. 001-32253) filed on March 29, 2011).
10.3	Euro Credit Agreement, dated June 15, 2005, among EnerSys S.p.A., Banca Intesa S.p.A., Sanpaolo IMI S.p.A., et al. (incorporated by reference to Exhibit 10.2 to EnerSys’ Current Report on Form 8-K (File No. 001-32253) filed on June 20, 2005).
10.4	Amendment to Euro 25,000,000 Credit Agreement (incorporated by reference to Exhibit 10.1 to EnerSys’ Current Report on Form 8-K (File No. 001-32253) filed on January 16, 2007).

96

Exhibit Number	Description of Exhibit
10.5	Waiver and Amendment Agreement to Euro 25,000,000 Credit Agreement, among EnerSys Holdings (Luxembourg) S.a.r.l., EnerSys, EnerSys Capital, Inc. and Intesa Sanpaolo S.p.A., as Facility Agent and lender (incorporated by reference to Exhibit 10.2 to EnerSys’ Current Report on Form 8-K (File No. 001-32253) filed on May 19, 2008).
10.6	Amendment and Supplemental Facility Agreement to the Company’s Euro 25 Million Credit Facility Agreement, dated October 16, 2008 (incorporated by reference to Exhibit 10.1 to EnerSys’ Current Report on Form 8-K (File No. 001-32253) filed on February 4, 2009).
10.7	Pledge Agreement, dated March 17, 2004, among EnerSys, various subsidiaries of EnerSys and Bank of America, N.A., as Collateral Agent (incorporated by reference to Exhibit 10.10 to EnerSys’ Registration Statement on Form S-1 (File No. 333-115553) filed on May 17, 2004).
10.8	Security Agreement, dated March 17, 2004, among EnerSys, various subsidiaries of EnerSys and Bank of America, N.A., as Collateral Agent (incorporated by reference to Exhibit 10.11 to EnerSys’ Registration Statement on Form S-1 (File No. 333-115553) filed on May 17, 2004).
10.9	Subsidiaries Guaranty, dated March 17, 2004, among various subsidiaries of EnerSys, in favor of Bank of America, N.A., as Administrative Agent (incorporated by reference to Exhibit 10.12 to EnerSys’ Registration Statement on Form S-1 (File No. 333-115553) filed on May 17, 2004).
10.10	Pledge over the Participation in EnerSys S.p.A., dated June 15, 2005, among EnerSys Holdings (Luxembourg) S.à r.l., Banca Intesa S.p.A., Sanpaolo IMI S.p.A., et al. (incorporated by reference to Exhibit 10.3 to EnerSys’ Current Report on Form 8-K (File No. 001-32253) filed on June 20, 2005).
10.11	Guaranty, dated June 15, 2005, of EnerSys Capital Inc. in favor of Sanpaolo IMI S.p.A. (incorporated by reference to Exhibit 10.4 to EnerSys’ Current Report on Form 8-K (File No. 001-32253) filed on June 20, 2005).
10.12	Stock Subscription Agreement, dated March 22, 2002, among EnerSys Holdings Inc., Morgan Stanley Dean Witter Capital Partners IV, L.P., Morgan Stanley Dean Witter Capital Investors IV, L.P., MSDW IV 892 Investors, L.P., Morgan Stanley Global Emerging Markets Private Investment Fund, L.P. and Morgan Stanley Global Emerging Markets Private Investors, L.P. (incorporated by reference to Exhibit 10.27 to Amendment No. 3 to EnerSys’ Registration Statement on Form S-1 (File No. 333-115553) filed on July 13, 2004).
10.13	Form of Indemnification Agreement between EnerSys and each of its Directors and Officers (incorporated by reference to Exhibit 10.18 to Amendment No. 3 to EnerSys’ Registration Statement on Form S-1 (File No. 333-115553) filed on July 13, 2004).
10.14	Employment Agreement, dated November 9, 2000, between Yuasa, Inc. and John D. Craig and letter of amendment thereto (incorporated by reference to Exhibit 10.2 to EnerSys’ Registration Statement on Form S-1 (File No. 333-115553) filed on May 17, 2004).
10.15	Employment Agreement, dated November 9, 2000, between Yuasa, Inc. and Richard W. Zuidema and letter of amendment thereto (incorporated by reference to Exhibit 10.6 to EnerSys’ Registration Statement on Form S-1 (File No. 333-115553) filed on May 17, 2004).
10.16	Employment Agreement, dated as of July 1, 2007 between EH Europe GmbH and Raymond R. Kubis (incorporated by reference to Exhibit 10.1 to EnerSys’ Quarterly Report on Form 10-Q (File No. 001-32253) filed on August 8, 2007).
10.17	Severance Agreement, dated as of May 26, 2011 between EnerSys and Michael J. Schmidtlein (filed herewith).

97

Exhibit Number	Description of Exhibit
10.18	Form of 2000 Management Equity Plan (incorporated by reference as Exhibit 10.1 to Amendment No. 3 to EnerSys’ Registration Statement on Form S-1 (File No. 333-115553) filed on July 13, 2004).
10.19	Form of 2004 Equity Incentive Plan (incorporated by reference to Exhibit 10.24 to Amendment No. 3 to EnerSys’ Registration Statement on Form S-1 (File No. 333-115553) filed on July 13, 2004).
10.20	EnerSys Amended and Restated 2006 Equity Incentive Plan (incorporated by reference to Exhibit 10.27 to EnerSys Annual Report on Form 10-K (File No. 001-32253) filed on June 11, 2008).
10.21	EnerSys Management Incentive Plan for fiscal year 2007 (incorporated by reference to Exhibit 10.1 to EnerSys’ Current Report on Form 8-K (File No. 001-32253) filed on July 6, 2006).
10.22	EnerSys Management Incentive Plan for fiscal year 2008 (incorporated by reference to Exhibit 10.1 to EnerSys’ Current Report on Form 8-K (File No. 001-32253) filed on April 2, 2007).
10.23	Form of 2010 Equity Incentive Plan (incorporated by reference to Appendix A to EnerSys’ Definitive Proxy Statement on Schedule 14A (File No. 001-32253) filed on June 16, 2010).
10.24	EnerSys Voluntary Deferred Compensation Plan for Executives as amended August 5, 2010, and May 26th, 2011 (incorporated by reference to Exhibit 10.23 to EnerSys’ Annual Report on Form 10-K (File No. 001-32253) filed on May 31, 2011).
10.25	Form of Employee Stock Purchase Plan (incorporated by reference to Exhibit 10.26 to Amendment No. 3 to EnerSys’ Registration Statement on Form S-1 (File No. 333-115553) filed on July 13, 2004).
10.26	Form of Restricted Stock Agreement (incorporated by reference to Exhibit 10.1 to EnerSys’ Current Report on Form 8-K (File No. 001-32253) filed on December 9, 2005).
10.27	Form of Stock Option Agreement (four year vesting) (incorporated by reference to Exhibit 10.1 to EnerSys’ Current Report on Form 8-K (File No. 001-32253) filed on May 23, 2007).
10.28	Form of Stock Option Agreement (three year vesting) (incorporated by reference to Exhibit 10.2 to EnerSys’ Current Report on Form 8-K (File No. 001-32253) filed on May 6, 2008).
10.29	Form of Restricted Stock Unit Agreement (incorporated by reference to Exhibit 10.1 to EnerSys’ Current Report on Form 8-K (File No. 001-32253) filed on May 23, 2007).
10.30	Form of Restricted Stock Unit Agreement - Non-Employee Directors (incorporated by reference to Exhibit 10.29 to EnerSys’ Annual Report on Form 10-K (File No. 001-32253) filed on June 1, 2009).
10.31	Form of Restricted Stock Unit Agreement - Employees – 2006 Equity Incentive Plan (incorporated by reference to Exhibit 10.30 to EnerSys’ Annual Report on Form 10-K (File No. 001-32253) filed on June 1, 2010).
10.32	Form of Market Share Restricted Stock Unit Agreement – Employees (incorporated by reference to Exhibit 10.31 to EnerSys’ Annual Report on Form 10-K (File No. 001-32253) filed on June 1, 2010).
10.33	Form of Market Share Restricted Stock Unit Agreement – Employees – 2010 Equity Incentive Plan (incorporated by reference to Exhibit 10.32 to EnerSys’ Annual Report on Form 10-K (File No. 001-32253) filed on May 31, 2011).
10.34	Form of Restricted Stock Unit Agreement – Employees and Senior Executives – 2010 Equity Incentive Plan (incorporated by reference to Exhibit 10.33 to EnerSys’ Annual Report on Form 10-K (File No. 001-32253) filed on May 31, 2011).

98

Exhibit Number	Description of Exhibit
10.35	Form of Restricted Stock Unit Agreement – Employees – 2010 Equity Incentive Plan (incorporated by reference to Exhibit 10.31 to EnerSys’ Annual Report on Form 10-K (File No. 001-32253) filed on May 31, 2011).
10.36	Form of Deferred Stock Unit Agreement - Non-Employee Directors – 2010 Equity Incentive Plan (incorporated by reference to Exhibit 10.35 to EnerSys’ Annual Report on Form 10-K (File No. 001-32253) filed on May 31, 2011).
10.37	Form of Severance Agreement (incorporated by reference to Exhibit 10.1 to EnerSys’ Quarterly Report on Form 10-Q (File No. 001-32253) filed on November 9, 2010).
10.38	Form of Stock Option Agreement (six month vesting) (incorporated by reference to Exhibit 10.31 to EnerSys’ Annual Report on Form 10-K (File No. 001-32253) filed on June 1, 2009).
11.1	Statement regarding Computation of Per Share Earnings.*
12.1	Computation of Ratio of Earnings to Fixed Charges (filed herewith).
21.1	Subsidiaries of the Registrant (filed herewith).
23.1	Consent of Ernst & Young LLP (filed herewith).
31.1	Certification of the Chief Executive Officer pursuant to Rule 13a-14(a)/15d-14(a) Under the Securities Exchange Act of 1934 (filed herewith).
31.2	Certification of the Chief Financial Officer pursuant to Rule 13a-14(a)/15d-14(a) Under the Securities Exchange Act of 1934 (filed herewith).
32.1	Certification of the Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (furnished herewith).
101.INS	XBRL Instance Document
101.SCH	XBRL Taxonomy Extension Schema Document
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	XBRL Taxonomy Extension Definition Document
101.LAB	XBRL Taxonomy Extension Label Document
101.PRE	XBRL Taxonomy Extension Presentation Document

* Information required to be presented in Exhibit 11 is provided in Note 18 of Notes to Consolidated Financial Statements under Part II, Item 8 of this Form 10-K in accordance with FASB guidance for calculating earnings per share.

99

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	ENERSYS
	By	/s/    JOHN D. CRAIG
Date: May 25, 2012		John D. Craig Chairman, President and Chief Executive Officer

POWER OF ATTORNEY

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose name appears below hereby appoints John D. Craig and Michael J. Schmidtlein and each of them, as his true and lawful agent, with full power of substitution and resubstitution, for him and in his, place or stead, in any and all capacities, to execute any and all amendments to the within annual report, and to file the same, together with all exhibits thereto, with the Securities and Exchange Commission, granting unto each said attorney-in-fact and agent, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully to all intents and purposes as he might or could do in person, hereby ratifying and confirming all that each said attorney-in-fact and agent may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, this annual report has been signed below by the following persons in the capacities and on the dates indicated

Name	Title	Date
/s/    JOHN D. CRAIG         John D. Craig	Chairman, President, and Chief Executive Officer and Director (Principal Executive Officer)	May 25, 2012
/s/    MICHAEL J. SCHMIDTLEIN         Michael J. Schmidtlein	Senior Vice President Finance and Chief Financial Officer (Principal Financial Officer)	May 25, 2012
/s/    KERRY M. KANE         Kerry M. Kane	Vice President and Corporate Controller (Principal Accounting Officer)	May 25, 2012
/s/    HWAN-YOON F. CHUNG         Hwan-yoon F. Chung	Director	May 25, 2012
/S/    SEIFI GHASEMI         Seifi Ghasemi	Director	May 25, 2012
/s/    HOWARD I. HOFFEN         Howard I. Hoffen	Director	May 25, 2012
/s/    ARTHUR T. KATSAROS         Arthur T. Katsaros	Director	May 25, 2012

100

Name	Title	Date
/s/    JOHN F. LEHMAN         John F. Lehman	Director	May 25, 2012
/s/    GENERAL ROBERT MAGNUS, USMC (RETIRED) General Robert Magnus, USMC (Retired)	Director	May 25, 2012
/s/    DENNIS S. MARLO         Dennis S. Marlo	Director	May 25, 2012
/s/    JOSEPH C. MUSCARI         Joseph C. Muscari	Director	May 25, 2012

101

Exhibit Index

Exhibit Number	Description of Exhibit
3.1	Fifth Restated Certificate of Incorporation (incorporated by reference to Exhibit 3.1 to Amendment No. 3 to EnerSys’ Registration Statement on Form S-1 (File No. 333-115553) filed on July 13, 2004).
3.2	Bylaws (incorporated by reference to Exhibits 3.2 to Amendment No. 3 to EnerSys’ Registration Statement on Form S-1 (File No. 333-115553) filed on July 13, 2004).
4.1	Indenture, dated as of May 28, 2008, between EnerSys and The Bank of New York, as trustee (incorporated by reference to Exhibit 4.1 to EnerSys’ Current Report on Form 8-K (File No. 001-32253) filed on May 28, 2008).
4.2	First Supplemental Indenture, dated as of May 28, 2008, between EnerSys and The Bank of New York, as trustee (incorporated by reference to Exhibit 4.2 to EnerSys’ Current Report on Form 8-K (File No. 001-32253) filed on May 28, 2008).
10.1	Credit Agreement, dated as of June 27, 2008, among EnerSys, Bank of America, N.A., as Administrative Agent, Wachovia Capital Markets, LLC, as Syndication Agent, Goldman Sachs Credit Partners L.P., RZB Finance LLC and PNC Bank, National Association, as Co-Documentation Agent, and the various lending institutions party thereto (incorporated by reference to Exhibit 10.1 to EnerSys’ Current Report on Form 8-K (File No. 001-32253) filed on June 30, 2008).
10.2	Credit Agreement, dated as of March 29, 2011, among EnerSys, Bank of America, N.A., as Administrative Agent, Wells Fargo Bank, National Association, as Syndication Agent, RB International Finance (USA) LLC and PNC Bank, National Association, as Co-Documentation Agents and Co-Managers and the various lending institutions party thereto (incorporated by reference to Exhibit 10.1 to EnerSys’ Current Report on Form 8-K (File No. 001-32253) filed on March 29, 2011).
10.3	Euro Credit Agreement, dated June 15, 2005, among EnerSys S.p.A., Banca Intesa S.p.A., Sanpaolo IMI S.p.A., et al. (incorporated by reference to Exhibit 10.2 to EnerSys’ Current Report on Form 8-K (File No. 001-32253) filed on June 20, 2005).
10.4	Amendment to Euro 25,000,000 Credit Agreement (incorporated by reference to Exhibit 10.1 to EnerSys’ Current Report on Form 8-K (File No. 001-32253) filed on January 16, 2007).
10.5	Waiver and Amendment Agreement to Euro 25,000,000 Credit Agreement, among EnerSys Holdings (Luxembourg) S.a.r.l., EnerSys, EnerSys Capital, Inc. and Intesa Sanpaolo S.p.A., as Facility Agent and lender (incorporated by reference to Exhibit 10.2 to EnerSys’ Current Report on Form 8-K (File No. 001-32253) filed on May 19, 2008).
10.6	Amendment and Supplemental Facility Agreement to the Company’s Euro 25 Million Credit Facility Agreement, dated October 16, 2008 (incorporated by reference to Exhibit 10.1 to EnerSys’ Current Report on Form 8-K (File No. 001-32253) filed on February 4, 2009).
10.7	Pledge Agreement, dated March 17, 2004, among EnerSys, various subsidiaries of EnerSys and Bank of America, N.A., as Collateral Agent (incorporated by reference to Exhibit 10.10 to EnerSys’ Registration Statement on Form S-1 (File No. 333-115553) filed on May 17, 2004).
10.8	Security Agreement, dated March 17, 2004, among EnerSys, various subsidiaries of EnerSys and Bank of America, N.A., as Collateral Agent (incorporated by reference to Exhibit 10.11 to EnerSys’ Registration Statement on Form S-1 (File No. 333-115553) filed on May 17, 2004).
10.9	Subsidiaries Guaranty, dated March 17, 2004, among various subsidiaries of EnerSys, in favor of Bank of America, N.A., as Administrative Agent (incorporated by reference to Exhibit 10.12 to EnerSys’ Registration Statement on Form S-1 (File No. 333-115553) filed on May 17, 2004).

102

Exhibit Number	Description of Exhibit
10.10	Pledge over the Participation in EnerSys S.p.A., dated June 15, 2005, among EnerSys Holdings (Luxembourg) S.à r.l., Banca Intesa S.p.A., Sanpaolo IMI S.p.A., et al. (incorporated by reference to Exhibit 10.3 to EnerSys’ Current Report on Form 8-K (File No. 001-32253) filed on June 20, 2005).
10.11	Guaranty, dated June 15, 2005, of EnerSys Capital Inc. in favor of Sanpaolo IMI S.p.A. (incorporated by reference to Exhibit 10.4 to EnerSys’ Current Report on Form 8-K (File No. 001-32253) filed on June 20, 2005).
10.12	Stock Subscription Agreement, dated March 22, 2002, among EnerSys Holdings Inc., Morgan Stanley Dean Witter Capital Partners IV, L.P., Morgan Stanley Dean Witter Capital Investors IV, L.P., MSDW IV 892 Investors, L.P., Morgan Stanley Global Emerging Markets Private Investment Fund, L.P. and Morgan Stanley Global Emerging Markets Private Investors, L.P. (incorporated by reference to Exhibit 10.27 to Amendment No. 3 to EnerSys’ Registration Statement on Form S-1 (File No. 333-115553) filed on July 13, 2004).
10.13	Form of Indemnification Agreement between EnerSys and each of its Directors and Officers (incorporated by reference to Exhibit 10.18 to Amendment No. 3 to EnerSys’ Registration Statement on Form S-1 (File No. 333-115553) filed on July 13, 2004).
10.14	Employment Agreement, dated November 9, 2000, between Yuasa, Inc. and John D. Craig and letter of amendment thereto (incorporated by reference to Exhibit 10.2 to EnerSys’ Registration Statement on Form S-1 (File No. 333-115553) filed on May 17, 2004).
10.15	Employment Agreement, dated November 9, 2000, between Yuasa, Inc. and Richard W. Zuidema and letter of amendment thereto (incorporated by reference to Exhibit 10.6 to EnerSys’ Registration Statement on Form S-1 (File No. 333-115553) filed on May 17, 2004).
10.16	Employment Agreement, dated as of July 1, 2007 between EH Europe GmbH and Raymond R. Kubis (incorporated by reference to Exhibit 10.1 to EnerSys’ Quarterly Report on Form 10-Q (File No. 001-32253) filed on August 8, 2007).
10.17	Severance Agreement, dated as of May 26, 2011 between EnerSys and Michael J. Schmidtlein (filed herewith).
10.18	Form of 2000 Management Equity Plan (incorporated by reference as Exhibit 10.1 to Amendment No. 3 to EnerSys’ Registration Statement on Form S-1 (File No. 333-115553) filed on July 13, 2004).
10.19	Form of 2004 Equity Incentive Plan (incorporated by reference to Exhibit 10.24 to Amendment No. 3 to EnerSys’ Registration Statement on Form S-1 (File No. 333-115553) filed on July 13, 2004).
10.20	EnerSys Amended and Restated 2006 Equity Incentive Plan (incorporated by reference to Exhibit 10.27 to EnerSys Annual Report on Form 10-K (File No. 001-32253) filed on June 11, 2008).
10.21	EnerSys Management Incentive Plan for fiscal year 2007 (incorporated by reference to Exhibit 10.1 to EnerSys’ Current Report on Form 8-K (File No. 001-32253) filed on July 6, 2006).
10.22	EnerSys Management Incentive Plan for fiscal year 2008 (incorporated by reference to Exhibit 10.1 to EnerSys’ Current Report on Form 8-K (File No. 001-32253) filed on April 2, 2007).
10.23	Form of 2010 Equity Incentive Plan (incorporated by reference to Appendix A to EnerSys’ Definitive Proxy Statement on Schedule 14A (File No. 001-32253) filed on June 16, 2010).
10.24	EnerSys Voluntary Deferred Compensation Plan for Executives as amended August 5, 2010, and May 26th, 2011 (incorporated by reference to Exhibit 10.23 to EnerSys’ Annual Report on Form 10-K (File No. 001-32253) filed on May 31, 2011).

103

Exhibit Number	Description of Exhibit
10.25	Form of Employee Stock Purchase Plan (incorporated by reference to Exhibit 10.26 to Amendment No. 3 to EnerSys’ Registration Statement on Form S-1 (File No. 333-115553) filed on July 13, 2004).
10.26	Form of Restricted Stock Agreement (incorporated by reference to Exhibit 10.1 to EnerSys’ Current Report on Form 8-K (File No. 001-32253) filed on December 9, 2005).
10.27	Form of Stock Option Agreement (four year vesting) (incorporated by reference to Exhibit 10.1 to EnerSys’ Current Report on Form 8-K (File No. 001-32253) filed on May 23, 2007).
10.28	Form of Stock Option Agreement (three year vesting) (incorporated by reference to Exhibit 10.2 to EnerSys’ Current Report on Form 8-K (File No. 001-32253) filed on May 6, 2008).
10.29	Form of Restricted Stock Unit Agreement (incorporated by reference to Exhibit 10.1 to EnerSys’ Current Report on Form 8-K (File No. 001-32253) filed on May 23, 2007).
10.30	Form of Restricted Stock Unit Agreement - Non-Employee Directors (incorporated by reference to Exhibit 10.29 to EnerSys’ Annual Report on Form 10-K (File No. 001-32253) filed on June 1, 2009).
10.31	Form of Restricted Stock Unit Agreement - Employees – 2006 Equity Incentive Plan (incorporated by reference to Exhibit 10.30 to EnerSys’ Annual Report on Form 10-K (File No. 001-32253) filed on June 1, 2010).
10.32	Form of Market Share Restricted Stock Unit Agreement – Employees (incorporated by reference to Exhibit 10.31 to EnerSys’ Annual Report on Form 10-K (File No. 001-32253) filed on June 1, 2010).
10.33	Form of Market Share Restricted Stock Unit Agreement – Employees – 2010 Equity Incentive Plan (incorporated by reference to Exhibit 10.32 to EnerSys’ Annual Report on Form 10-K (File No. 001-32253) filed on May 31, 2011).
10.34	Form of Restricted Stock Unit Agreement – Employees and Senior Executives – 2010 Equity Incentive Plan (incorporated by reference to Exhibit 10.33 to EnerSys’ Annual Report on Form 10-K (File No. 001-32253) filed on May 31, 2011).
10.35	Form of Restricted Stock Unit Agreement – Employees – 2010 Equity Incentive Plan (incorporated by reference to Exhibit 10.31 to EnerSys’ Annual Report on Form 10-K (File No. 001-32253) filed on May 31, 2011).
10.36	Form of Deferred Stock Unit Agreement - Non-Employee Directors – 2010 Equity Incentive Plan (incorporated by reference to Exhibit 10.35 to EnerSys’ Annual Report on Form 10-K (File No. 001-32253) filed on May 31, 2011).
10.37	Form of Severance Agreement (incorporated by reference to Exhibit 10.1 to EnerSys’ Quarterly Report on Form 10-Q (File No. 001-32253) filed on November 9, 2010).
10.38	Form of Stock Option Agreement (six month vesting) (incorporated by reference to Exhibit 10.31 to EnerSys’ Annual Report on Form 10-K (File No. 001-32253) filed on June 1, 2009).
11.1	Statement regarding Computation of Per Share Earnings.*
12.1	Computation of Ratio of Earnings to Fixed Charges (filed herewith).
21.1	Subsidiaries of the Registrant (filed herewith).
23.1	Consent of Ernst & Young LLP (filed herewith).
31.1	Certification of the Chief Executive Officer pursuant to Rule 13a-14(a)/15d-14(a) Under the Securities Exchange Act of 1934 (filed herewith).

104

Exhibit Number	Description of Exhibit
31.2	Certification of the Chief Financial Officer pursuant to Rule 13a-14(a)/15d-14(a) Under the Securities Exchange Act of 1934 (filed herewith).
32.1	Certification of the Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (furnished herewith).
101.INS	XBRL Instance Document
101.SCH	XBRL Taxonomy Extension Schema Document
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	XBRL Taxonomy Extension Definition Document
101.LAB	XBRL Taxonomy Extension Label Document
101.PRE	XBRL Taxonomy Extension Presentation Document

* Information required to be presented in Exhibit 11 is provided in Note 18 of Notes to Consolidated Financial Statements under Part II, Item 8 of this Form 10-K in accordance with FASB guidance for calculating earnings per share.

105

EX-10.17

Exhibit 10.17

May 26, 2011

Mr. Michael J. Schmidtlein

[Home Address]

[Home Address]

Re: Severance Agreement

Dear Mike:

EnerSys (the “Company”) considers it essential and in the best interests of its stockholders to foster the continuous employment of key management personnel. In this regard, the Board of Directors of the Company (the “Board”) recognizes that the possibility of a termination of employment related to a change in control of the Company may exist and that such possibility, and the uncertainty and questions that it may raise among management, may result in the departure or distraction of management personnel to the detriment of the Company and its stockholders.

The Board has determined that appropriate steps should be taken to reinforce and encourage the continued attention and dedication of members of the Company’s senior management, including you, to their assigned duties without distraction in the face of potentially disturbing circumstances arising from the possibility of a termination of employment.

In order to induce you to remain in the employ of the Company, the Company agrees that you will receive the severance benefits set forth in this letter agreement (the “Agreement”) in the event your employment with the Company is terminated under the circumstances described below.

1. Term of Agreement.

1.1 The term of this Agreement will commence on the date above (the “Effective Date”) and will continue for a period of three (3) years thereafter. Commencing on the third anniversary of the Effective Date and on each anniversary thereafter (“Anniversary Date”), this Agreement will automatically be renewed for one (1) additional year beyond the term otherwise established, unless one party provides written notice to the other party, at least one (1) year in advance of an Anniversary Date, of its intent not to renew this Agreement for an additional one year term. Nothing in this provision will preclude termination as otherwise provided or permitted under this Agreement. Notwithstanding the foregoing, if a Change in Control occurs after the Effective Date and during the term of this Agreement, this Agreement will continue in effect for a limited

1.2 period of two (2) years after the date of such Change in Control, unless terminated sooner in accordance with this Agreement.

1.3 You acknowledge that your employment with the Company constitutes “at-will” employment and that, because you are an at-will employee, either you or the Company may terminate your employment at any time, upon written notice of termination within a reasonable period of time before the effective date of the termination, subject to the procedures and consequences set forth in this Agreement.

2. Severance Benefits.

2.1 Termination by the Company without Cause or by You with Good Reason in connection with a Change in Control: If your employment hereunder is terminated by the Company other than for death, disability, or Cause or by you for Good Reason, in each case (i) during the six (6) month period prior to a Change in Control and it is reasonably demonstrated by you that your termination of employment was at the request of a third party who has taken steps reasonably calculated to effect a Change in Control or otherwise arose in connection with or anticipation of a Change in Control or (ii) on or within twenty-four (24) months after a Change in Control (such time periods, the “Protection Period”), you will be entitled to receive:

a. A lump sum cash payment within sixty (60) days following your termination of employment equal to your annual base compensation then in effect (or immediately prior to any reduction resulting in a termination for Good Reason);

b. For a period of one (1) year following your termination, you and your beneficiaries will remain eligible to participate, on the same terms and conditions as apply from time to time to the Company’s senior management generally, in the health, vision and dental programs of the Company; provided, however, that such eligibility will cease at such time as you become eligible to participate in comparable programs of a subsequent employer; and further provided that the Company will have no obligation to continue to maintain during such period any plan or program, solely as a result of the provisions of this Agreement; and further provided that if you are precluded from participating in any such plan or program by its terms or applicable law, you will receive a dollar amount equal to the cost (estimated in good faith by the Company) of obtaining such benefits, or substantially similar benefits, within thirty (30) days following the date of your termination;

c. Immediate and full vesting of any unvested and outstanding equity awards granted to you, payable pursuant to the terms of any plan or other agreement under or pursuant to which any such equity awards were granted; provided that to the extent the benefits provided under this paragraph conflict with the terms of any such plan or agreement, the terms of such plan or agreement will control; and

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d. A pro-rata payment from the Company’s annual incentive plan for the fiscal year in which your termination occurred, equal to the payment you would have received had you remained in the employment of the Company through the end of such fiscal year, multiplied by a fraction, the numerator of which is the number of full months elapsed from the start of such fiscal year to the date of your termination of employment, and the denominator of which is 12. Such amount, if any, will be paid at the time such award would otherwise have been paid to other participants had your employment not terminated, but in no event later than two and one-half months following the end of such fiscal year.

2.2 Good Reason: You will be considered to have terminated employment hereunder for Good Reason if such termination of employment is on account of any of the following actions by the Company, which occur during the Protection Period, without your express written consent:

a. A reduction of ten percent (10%) or more in your annual base compensation, other than a reduction which is proportionate to a Company-wide reduction in senior management pay;

b. Any material diminution of your positions, duties, or responsibilities;

c. Any permanent reassignment of you to a location greater than fifty (50) miles from the location of your primary office, unless such new location is closer to your primary residence; or

d. A material breach by the Company of its obligations under this Agreement.

Notwithstanding the foregoing, a termination by you will not be for “Good Reason,” unless you have given the Company at least ten (10) business days written notice specifying the grounds upon which you intend to terminate your employment hereunder for “Good Reason” and such notice is received by the Company within ninety (90) days of the date the event of “Good Reason” occurred. In addition, any action or inaction by the Company which is remedied within thirty (30) days following such written notice will not constitute “Good Reason” for termination hereunder and will render such notice null and void.

2.3 Change in Control. Change in Control means a “Change in Control” as defined under the EnerSys 2010 Equity Incentive Plan, as such term may be amended therein from time to time.

2.4 Cause. “Cause” means any of the following events: (a) breach of your fiduciary duty to the Company or your duty of loyalty to the Company; (b) willful act of material dishonesty with respect to any material matter involving the Company; (c) theft or material misuse of Company property; (d) failure to conform in any material respect to the Company’s code of conduct (i.e., the policies and procedures related to the employment of employees by the Company as set forth in an employee handbook or any similar document or as communicated to you); (e) excessive absenteeism (which will not include authorized absences for leave pursuant to the Family and Medical Leave Act, the Americans With Disabilities Act, or the Company’s vacation, paid time off, or short-term disability leave plans, policies, or arrangements, or service in the uniformed services as such term is defined by the Uniformed Services Employment and

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Reemployment Rights Act) having a material adverse effect on Company business operations; (f) conviction of, or plea of guilty or nolo contendere to, a felony, any criminal charge involving moral turpitude, or illegal substance abuse charges; (g) continuing neglect of management duties and responsibilities that has a material adverse effect on the Company; (h) willful failure to timely report to the Board or direct supervisor information having a material adverse effect on Company business operations; or (i) failure to meet reasonable and achievable documented performance expectations (other than any such failure resulting from incapacity due to physical or mental illness).

2.5 Clawback – For Cause Matters. If, within ninety (90) days after a termination of your employment that entitles you to severance benefits under Section 2, the Board becomes aware of facts that, if known during your employment, it reasonably believes would have justified termination of your employment for Cause, the Company may refrain from paying any unpaid amounts due under Section 2 or require you to promptly (but in no event less than ninety (90) days after notice to you of such determination by the Board) repay any amounts previously paid or the value of any benefits previously received under Section 2.

2.6 Accrued Benefits. Upon your termination of employment for any reason, you, or your estate, as applicable, will receive your accrued but unpaid annual base compensation and any accrued but unpaid or otherwise vested benefits under any Company benefit or incentive plan.

3. Best Net Benefit Limitation. Anything contained in this Agreement to the contrary notwithstanding, if any of the payments or benefits received or to be received by you pursuant to this Agreement (which the parties agree will not include any portion of payments allocated to the non-solicitation and non-competition provisions of Section 4 that are classified as payments of reasonable compensation for purposes of Section 280G of the Internal Revenue Code of 1986, as amended (the “Code”)), when taken together with payments and benefits provided to you under any other plans, contracts, or arrangements with the Company (all such payments and benefits, the “Total Payments”), will be subject to any excise tax imposed under Code Section 4999 (together with any interest or penalties, the “Excise Tax”), then such Total Payments will be reduced to the extent necessary so that no portion thereof will be subject to the Excise Tax; provided, however, that if you would receive in the aggregate greater value (as determined under Code Section 280G and the regulations thereunder) on an after tax basis if the Total Payments were not subject to such reduction, then no such reduction will be made. To effectuate the reduction described above, if applicable, the Company will first reduce or eliminate the payments and benefits provided under this Agreement. All calculations required to be made under this Section, including the portion of the payments hereunder to be allocated to the restrictive covenants set forth in Section 4, will be made by the Company’s independent public accountants, subject to the right of your representative to review the same. The parties recognize that the actual implementation of the provisions of this Section are complex and agree to deal with each other in good faith to resolve any questions or disagreements arising hereunder.

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4. Covenant Not to Compete; Nonsolicitation; Confidential Information; Nondisparagement.

4.1 You agree with the Company that you will not at any time, except in performance of your obligations to the Company or with the prior written consent of the Company, directly or indirectly, reveal to any “Person” (as defined in Section 3(9) of the Employee Retirement Income Security Act of 1974, as amended) (other than the Company, or its employees, officers, directors, shareholders, or agents) or use for your own benefit any information deemed to be confidential by the Company or any of its subsidiaries or affiliates (such subsidiaries and affiliates, collectively “Affiliates”) (“Confidential Information”) relating to the assets, liabilities, employees, goodwill, business affairs of the Company or any of its Affiliates, including, without limitation, any information concerning past, present, or prospective customers, manufacturing processes, marketing, operating, or financial data, or other confidential information used by, or useful to, the Company or any of its Affiliates and known (whether or not known with the knowledge and permission of the Company or any of its Affiliates and whether or not at any time prior to the Effective Date developed, devised, or otherwise created in whole or in part by your efforts) to you by reason of your employment by, shareholdings in or other association with the Company or any of its Affiliates. You further agree that you will retain all copies and extracts of any written or electronic Confidential Information acquired or developed by you during any such employment, shareholding, or association in trust for the sole benefit of the Company, its Affiliates, and their successors and assigns. You further agree that you will not, without the prior written consent of the Company, remove or take from the Company’s or any of its Affiliate’s premises (or if previously removed or taken, you will promptly return) any written or electronic Confidential Information or any copies or extracts thereof. Upon the request and at the expense of the Company, you will promptly make all disclosures, execute all instruments and papers, and perform all acts reasonably necessary to vest and confirm in the Company and its Affiliates, fully and completely, all rights created or contemplated by this Section 4.1. The term “Confidential Information” will not include information that is or becomes generally available to the public other than as a result of a disclosure by, or at the direction of, you. Your agreements set forth in this Section 4.1 regarding Confidential Information are independent of, and in addition to, your agreements set forth in the rest of Section 4 and will not be construed either to enlarge or to contract the scope of such other agreements.

4.2 You agree with the Company that, for so long as you are employed by the Company or any of its Affiliates and continuing for the Restricted Period (as defined below), you will not, without the prior written consent of the Company, directly or indirectly, and whether as principal or investor or as an employee, officer, director, manager, partner, consultant, agent, or otherwise, alone or in association with any other Person, become involved in a Competing Business (as defined below) in the Americas, Europe, or Asia, or any other geographic area in which the Company or any of its Affiliates has engaged during such period in any of the activities which comprise a Competing Business, or in which you have knowledge of the Company’s plans to engage in any of the activities which comprise a Competing Business (including, without limitation, any area in which any customer of the Company or any of its Affiliates may be located). This Section 4.2 will not be violated, however, by your investment of up to $100,000 in the aggregate in one or several publicly-traded companies that engage in a Competing Business.

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4.3 As a separate and independent covenant, you agree with the Company that, for so long as you are employed by the Company or any of its Affiliates and continuing for the Restricted Period (as defined below), you will not in any way, directly or indirectly (except in the course of your employment with the Company and its Affiliates), for the purpose of conducting or engaging in any Competing Business, call upon, solicit, advise, or otherwise do, or attempt to do, business with any Person who is, or was, during the then most recent 12-month period, a customer of the Company or any of its Affiliates, or take away or interfere or attempt to take away or interfere with any custom, trade, business, patronage, or affairs of the Company or any of its Affiliates, or hire or attempt to hire, or otherwise engage or attempt to engage as an independent contractor or otherwise any Person who is, or was during the then most recent 12-month period, an employee, officer, representative, or agent of the Company or any of its Affiliates, or solicit, induce, or attempt to solicit or induce any Person who is an employee, officer, representative, or agent of the Company or any of its Affiliates to leave the employ of the Company or any of its Affiliates or cease their business relationship with Company or any of its Affiliates (as the case may be), or violate the terms of their contracts, or any employment arrangements, with the Company or any of its Affiliates.

4.4 For purposes of this Section 4, a “Competing Business” means a business or enterprise (other than the Company and its Affiliates) that is engaged in any or all of the design, manufacture, importing, development, distribution, marketing, or sale of:

a. reserve power products (including, without limitation, those products used for backup power for the continuous operation of critical applications in telecommunications systems, uninterruptible power systems, or UPS, applications for computer and computer-controlled systems, and other specialty power applications, including security systems, for premium starting, lighting and ignition applications, in switchgear and electrical control systems used in electric utilities and energy pipelines, and in commercial aircraft and military aircraft, submarines, ships and tactical vehicles); and/or

b. motive power products (including, without limitation, products used to provide power for manufacturing, warehousing, and other material handling equipment, such as electrical industrial forklift trucks, mining equipment, and diesel locomotive starting, rail car lighting, and rail signaling equipment); and/or

c. lithium ion cells or batteries (for aerospace and defense applications, or otherwise); and/or

d. hydrogen fuel cells; and/or

e. any other product the Company is producing, marketing, researching, or developing at the time of your termination of employment.

“Competing Business” also includes the design, engineering, installation, or service of stationary and DC power systems, and any consulting and/or turnkey services relating thereto.

4.5 You confirm that all Confidential Information is and will remain the exclusive property of the Company and its Affiliates. All business records, papers, and documents kept or made by you relating to the business of the Company will be and remain the property of the Company and its Affiliates.

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4.6 You agree to refrain from performing any act, engaging in any conduct or course of action or making or publishing any statements, claims, allegations or assertions which have or may reasonably have the effect of demeaning the name or business reputation of the Company or any of its subsidiaries, or any of its or their employees, officers, directors, agents or advisors in their capacities as such or which adversely affects (or may reasonably be expected adversely to affect) the best interests (economic or otherwise) of any of them. Subject to the provisions of this Agreement, nothing in this Section 4.6 will preclude you from fulfilling any duty or obligation that you may have at law, from responding to any subpoena or official inquiry from any court or government agency, including providing truthful testimony, documents subpoenaed or requested or otherwise cooperating in good faith with any proceeding or investigation; or from taking any reasonable actions to enforce your rights under this Agreement in accordance with the dispute provisions specified in Section 7 hereof.

4.7 Without intending to limit the remedies available to the Company and its Affiliates, you agree that a breach of any of the covenants contained in this Section 4 may result in material and irreparable injury to the Company or its Affiliates for which there is no adequate remedy at law, that it will not be possible to measure damages for such injuries precisely and that, in the event of such a breach or threat thereof, the Company and its Affiliates will be entitled to seek a temporary restraining order or a preliminary or permanent injunction, or both, without bond or other security, restraining you from engaging in activities prohibited by this Section 4 or such other relief as may be required specifically to enforce any of the covenants in this Section 4. Such injunctive relief in any court will be available to the Company and its Affiliates in lieu of, or prior to or pending determination in, any arbitration proceeding.

4.8 Although you and the Company consider the restrictions contained in this Section 4 to be the minimum restriction reasonable for the purposes of preserving the Company’s goodwill and other proprietary rights, if a final determination is made by a court that the time or territory, or any other restriction contained in this Section 4 is an unreasonable or otherwise unenforceable restriction against you, the provisions of this Section 4 will not be rendered void, but will be deemed amended to apply as to such maximum time and territory and to such other extent as the court may determine to be reasonable.

4.9 Notwithstanding anything to the contrary in Section 2.1, in the event that you breach any of the covenants contained in this Section 4:

a. Any remaining payments or benefits to be provided under Section 2.1 will not be paid or will cease immediately upon such breach; and

b. The Company will be entitled to the immediate repayment of all payments and benefits provided under Section 2.1.

4.10 You agree that the covenants contained in this Section 4 may be assigned by the Company, as needed, to affect its purpose and intent and that the Company’s assignee will be entitled to the full benefit of the restrictions enjoyed by the Company under the terms of these covenants.

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4.11 The term “Restricted Period” means one (1) year following the termination of your employment for any reason; provided, however, that the Restricted Period will be extended by a period of time equal to any period during which you are in breach of any of the covenants set forth in this Section 4.

5. Binding Effect and Benefit.

5.1 The Company will require any successor (whether direct or indirect, by purchase, merger, consolidation, or otherwise) to all or substantially all of the business or assets of the Company to expressly assume and agree to perform this Agreement in the same manner and to the same extent that the Company would be required to perform it if no such succession had taken place. Failure by the Company to obtain such assumption and agreement prior to the effectiveness of any such succession will constitute a material breach of this Agreement. As used in this Agreement, “the Company” means the Company as defined above and any successor to the respective business or assets of the Company as abovementioned which assumes and agrees to perform this Agreement by operation of law, or otherwise.

5.2 This Agreement will inure to the benefit of and be enforceable by your personal or legal representatives, executors, administrators, heirs, distributees, devisees, and legatees. If you should die while any amount is payable to you under this Agreement if you had continued to live, all such amounts, unless otherwise provided herein, will be paid in accordance with the terms of this Agreement to your devisee, legatee, or other designee, or, if there is no such designee, to your estate.

6. Assignment. This Agreement will not be assignable by either party hereto, except as provided in Section 4.10 and by the Company to any successor in interest to the business of the Company, provided that the Company (if it remains a separate entity) will remain fully liable under this Agreement for all obligations, payments, and otherwise.

7. Arbitration. Subject to Section 4.7, any dispute or controversy arising under or in connection with this Agreement that cannot be mutually resolved by the parties hereto will be settled exclusively by arbitration in Philadelphia, Pennsylvania before one arbitrator of exemplary qualifications and stature, who will be selected jointly by you and the Company, or, if you and the Company cannot agree on the selection of the arbitrator, will be selected by the American Arbitration Association. Judgment may be entered on the arbitrator’s award in any court having jurisdiction. The parties hereby agree that the arbitrator will be empowered to enter an equitable decree mandating specific enforcement of the terms of this Agreement. Each party will bear its own costs, including legal fees and out-of-pocket expenses, incurred in connection with any arbitration, and the party that prevails will bear all expenses of the arbitrator.

8. No Mitigation or Offset. In the event of termination of your employment, you will be under no obligation to seek other employment and there will be no offset against any payment or benefit provided for in this Agreement on account of any remuneration or benefits from any subsequent employment that you may obtain.

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9. Application of Code Section 409A.

9.1 Notwithstanding anything in this Agreement to the contrary, the receipt of any benefits under this Agreement as a result of a termination of employment will be subject to satisfaction of the condition precedent that you undergo a “separation from service” within the meaning of Treas. Reg. § 1.409A-1(h) or any successor thereto. In addition, if you are deemed to be a “specified employee” within the meaning of that term under Code Section 409A(a)(2)(B), then with regard to any payment or the provisions of any benefit that is required to be delayed pursuant to Code Section 409A(a)(2)(B), such payment or benefit will not be made or provided prior to the earlier of (i) the expiration of the six (6) month period measured from the date of your “separation from service” (as such term is defined in Treas. Reg. § 1.409A-1(h)), or (ii) the date of your death (the “Delay Period”). Within ten (10) days following the expiration of the Delay Period, all payments and benefits delayed pursuant to this Section (whether they would have otherwise been payable in a single sum or in installments in the absence of such delay) will be paid or reimbursed to you in a lump sum, and any remaining payments and benefits due under this Agreement will be paid or provided in accordance with the normal payment dates specified for them herein. To the extent that the foregoing applies to the provision of any ongoing welfare benefits to you that would not be required to be delayed if the premiums therefore were paid by you, you will pay the full costs of premiums for such welfare benefits during the Delay Period and the Company will pay you an amount equal to the amount of such premiums paid by you during the Delay Period within ten (10) days after the conclusion of such Delay Period.

9.2 Except as otherwise expressly provided herein, to the extent any expense reimbursement or other in-kind benefit is determined to be subject to Code Section 409A, the amount of any such expenses eligible for reimbursement or in-kind benefits in one calendar year will not affect the expenses eligible for reimbursement or in-kind benefits in any other taxable year (except under any lifetime limit applicable to expenses for medical care), in no event will any expenses be reimbursed or in-kind benefits be provided after the last day of the calendar year following the calendar year in which you incurred such expenses or received such benefits, and in no event will any right to reimbursement or in-kind benefits be subject to liquidation or exchange for another benefit.

9.3 Any payments made pursuant to Section 2.1, to the extent of payments made from the date of termination through March 15th of the calendar year following such date, are intended to constitute separate payments for purposes of Treas. Reg. §1.409A-2(b)(2) and thus payable pursuant to the “short-term deferral” rule set forth in Treas. Reg. §1.409A-1(b)(4); to the extent such payments are made following said March 15th, they are intended to constitute separate payments for purposes of Treas. Reg. §1.409A-2(b)(2) made upon an involuntary termination from service and payable pursuant to Treas. Reg. §1.409A-1(b)(9)(iii), to the maximum extent permitted by said provision.

9.4 To the extent it is determined that any benefits described in Section 2.1(b) are taxable to Executive, they are intended to be payable pursuant to Treas. Reg. §1.409A-1(b)(9)(v), to the maximum extent permitted by said provision.

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10. Miscellaneous.

10.1 The invalidity or unenforceability of any provision of this Agreement will not affect the validity or enforceability of any other provision of this Agreement, which will remain in full force and effect.

10.2 The validity, interpretation, construction, and performance of this Agreement will be governed by the laws of the Commonwealth of Pennsylvania, without regard to its conflict of laws principles.

10.3 No waiver by you or the Company at any time of any breach of, or compliance with, any provision of this Agreement to be performed by the Company or you, respectively, will be deemed a waiver of that or any other provision at any subsequent time.

10.4 Upon any termination of employment that entitles you to payments and benefits under Section 2, you must, within prescribed time limits, execute a legally enforceable release agreement substantially in the form of Exhibit A attached hereto prior to the receipt of such payments and benefits. Any payments made to you will be paid net of any applicable withholding required under federal, state, local, or foreign law.

10.5 This Agreement is the exclusive agreement with respect to the severance benefits payable to you in the event of a termination of your employment. All prior negotiations and agreements are hereby merged into this Agreement. You acknowledge and agree that any employment agreement, offer letter, and/or any agreement regarding change in control or termination benefits, previously entered into between you and the Company is immediately null and void.

10.6 Notwithstanding the termination of this Agreement, the provisions which specify continuing obligations, compensation and benefits, and rights will remain in effect until such time as all such obligations are discharged, all such compensation and benefits are received, and no party or beneficiary has any remaining actual or contingent rights under this Agreement.

11. Legal Fees. In the event of a dispute following a Change in Control, the Company, or its successor, will reimburse you for all reasonable legal fees and expenses incurred by you in attempting to obtain or enforce rights or benefits provided by this Agreement, if, with respect to any such right or benefit, you are successful in obtaining or enforcing such right or benefit (including by negotiated settlement).

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If you agree to the terms of this Agreement, please sign on the line provided below and return two signed copies to the Company. A fully executed copy will be returned to you for your files after it is signed by the Company.

Sincerely,
ENERSYS
By:
Title:	Chairman, President and CEO
Dated:
Agreed to and accepted:
Michael J. Schmidtlein
Dated:	May 26, 2011

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APPENDIX A

FORM OF GENERAL RELEASE

Reference is made to the Severance Agreement dated as of                      (the “Severance Agreement”), between EnerSys, a Delaware corporation (the “Company”), and                      (the “Executive”). Capitalized terms used herein without definition shall have the meanings assigned to them in the Severance Agreement, a copy of which is attached hereto.

SECTION 1. Mutual Release.

(a) General Waiver and Release. In consideration of their respective obligations under the Severance Agreement in connection with and following the Executive’s termination of employment with the Company and its affiliates, and subject to the limitations set forth in Section 2 hereof, the Company, on the one hand, does hereby release and forever discharge the Executive, and the Executive, on the other hand, does hereby release and forever discharge the Company, its present, former, and future shareholders, affiliates, direct and indirect parents, subsidiaries, successors, directors, officers, employees, agents, attorneys, heirs, and assigns (the “Company Parties” and, together with the Executive, the “Released Parties”), from any and all claims, actions, causes of action, suits, costs, controversies, judgments, decrees, verdicts, damages, liabilities, attorneys’ fees, covenants, contracts, and agreements that the Executive may have against the Company Parties or the Company Parties may have against the Executive, or in the future may possess based on events occurring during the term of the Executive’s employment with the Company arising out of (i) the Executive’s employment relationship with or service as an employee or officer of the Company and its affiliates or the termination of such relationship or service or (ii) any event, condition, circumstance or obligation that occurred, existed or arose on or prior to the date the Executive signs this Release, with respect to each other, including, but not limited to, any claims arising under Title VII of the Civil Rights Act of 1964, the Rehabilitation Act of 1973, the Americans with Disabilities Act of 1990, the Civil Rights Act of 1866, the Civil Rights Act of 1991, the Employee Retirement Income Security Act of 1974, the Family Medical Leave Act of 1993, or any other federal or state or local law or any foreign jurisdiction, whether such claim arises under statute, common law, or in equity, and whether or not any of the Released Parties are presently aware of the existence of such claim, damage, action or cause of action, suit, or demand (collectively, including claims, actions, and causes of action set forth in Section 1(b) below, the “Claims”). The Executive and the Company Parties also do forever release, discharge, and waive any right the Executive or the Company Parties may have to recover in any proceeding brought by any federal, state, or local agency against the Company Parties and the Executive, respectively, to enforce any laws. Each of the parties hereto agrees that the value received or to be received in the future as described in the Severance Agreement shall be in full satisfaction of any and all claims, actions, or causes of action for payment or other benefits of any kind that the Executive may have against the Company Parties and that the Company Parties may have against the Executive; provided, however, that nothing in this Agreement shall preclude the Company from recouping, or refusing to pay, (i) severance benefits under the Severance Agreement in accordance with Section 2.5 thereof or (ii) cash or equity incentive-based compensation paid or payable to the Executive in the event of a restatement of the Company’s financial statements pursuant to applicable law or regulation or Company policy adopted consistent with applicable law or regulation.

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(b) ADEA Release. In further recognition of the above, the Executive hereby releases and forever discharges each of the Company Parties from any and all claims, actions and causes of action that the Executive may have as of the date the Executive signs and delivers to the Company this Release arising under the federal Age Discrimination in Employment Act of 1967, as amended, and the applicable rules and regulations promulgated thereunder (“ADEA”).

SECTION 2. Limitations.

(a) No Impact on Obligations under the Severance Agreement or the Shareholder Agreement. The releases contained herein do not, are not intended to, and shall not be interpreted to serve as a release or waiver by the Executive or the Company Parties with respect to their respective rights and obligations set forth in the Severance Agreement. In particular, and without limiting the generality of the preceding sentence, the Executive does not waive or release any claim the Executive might now or in the future have to be paid or receive the payments and benefits provided for in Section 2 of the Severance Agreement, and the Company Parties do not waive or release any claim they might now or in the future have under Section 4 of the Severance Agreement.

(b) No Impact on Indemnification Rights. The releases contained herein do not, are not intended to, and shall not be interpreted to serve as a release or waiver by the Executive with respect to any indemnification rights the Executive may have and such indemnification rights shall not be effected, modified, or extinguished by the Executive’s execution of this Release.

SECTION 3. No Pending Litigation.

The Executive represents and agrees that the Executive has not filed, and will not file, any action, complaint, charge, grievance, or arbitration against any Company Party, except that such agreement shall not apply to any claim based on any matter which, pursuant to Section 2, is excluded from the scope of this Release. The Company hereby represents and agrees that no Company Party has filed, and no Company Party will file, any action, complaint, charge, grievance, or arbitration against the Executive except that such agreement shall not apply to any claim based on any matter which, pursuant to Section 2, is excluded from the scope of this Release.

SECTION 4. Acknowledgment.

The Executive acknowledges and confirms that (i) the Executive has been advised in writing by the Company in connection with the Executive’s termination to consult with an attorney of the Executive’s choice prior to signing this Release and to have such attorney explain to the Executive the terms of the Release, including, without limitation, the terms relating to the Executive’s release of Claims arising under ADEA; (ii) the Executive has read this Release carefully and completely and understands each of the terms hereof; and (iii) the Executive was given not less than twenty-one (21) days to consider the terms of the Release and to consult with an attorney of the Executive’s choosing with respect thereto, and that for a period of seven (7) days following the Executive’s signing of this Agreement, the Executive shall have the option to revoke this Agreement in accordance with the terms set forth in Section 6 below.

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SECTION 5. Successors.

The rights and obligations under this Agreement shall inure to any and all successors of the Company.

SECTION 6. Revocation.

The Executive shall have the right to revoke this Release during the seven-day period commencing immediately following the date the Executive signs and delivers this Agreement to the Company (the “Revocation Period”). The period shall expire at 5:00 p.m., Eastern Standard Time, on the last day of the seven-day period; provided, however, that if such seventh day is not a business day, the period shall extend to 5:00 p.m. on the next succeeding business day. In the event of any such revocation by the Executive, the obligations of the Company under this Release shall terminate and be of no further force and effect as of the date of such revocation. No such revocation by the Executive shall be effective unless it is in writing and signed by the Executive and received by a representative of the Company prior to the expiration of the Revocation Period.

SECTION 7. Counterparts.

This Release may be executed in two or more counterparts, each of which shall be deemed to be an original but all of which together will constitute one and the same instrument.

ENERSYS

By:
	Name:
	Title:
ACCEPTED AND AGREED:
[Name]
Dated:

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EX-12.1

Exhibit 12.1

RATIO OF EARNINGS TO FIXED CHARGES

EnerSys

Computation of Ratio of Earnings to Fixed Charges

The following table sets forth the ratio of earnings to fixed charges of the Company for the five fiscal years ended March 31, 2012:

	Fiscal year ended March 31,
	2012		2011		2010		2009		2008
	(dollars in thousands)
Earnings:
Income before provision for income taxes	$	191,295	$	151,444	$	87,255	$	119,100	$	86,195
Plus: fixed charges		27,821		32,679		32,573		37,544		39,140
Total		219,116		184,123		119,828		156,644		125,335
Fixed charges:
Interest expense	$	17,281	$	23,330	$	23,587	$	27,795	$	29,746
Interest within rental expense		10,540		9,349		8,986		9,749		9,394
Total		27,821		32,679		32,573		37,544		39,140
Ratio of earnings to fixed charges		7.88		5.63		3.68		4.17		3.20

NOTE: These ratios include EnerSys and its consolidated subsidiaries. The ratio of earnings to fixed charges was computed by dividing earnings by fixed charges for the periods indicated, where “earnings” consist of (1) earnings from operations before income taxes plus (2) fixed charges, and “fixed charges” consist of (a) interest, whether expensed or capitalized, on all indebtedness, including non-cash interest accreted on Convertible Notes of $6,436 and $5,917, respectively, in fiscal 2012 and fiscal 2011, (b) amortization of premiums, discounts and capitalized expenses related to indebtedness, and (c) an interest component representing one-third of total operating lease rental expense, which is that portion deemed to be interest. Interest related to uncertain tax positions is included in the tax provision in the Company’s Consolidated Statements of Income and is excluded from the computation of fixed charges.

EX-21.1

Exhibit 21.1

ENERSYS

Subsidiaries

Subsidiary	Jurisdiction of Incorporation or Organization
EnerSystem de Argentina S.A.	Argentina
EnerSys Australia Pty Ltd.	Australia
EnerSys GmbH	Austria
EnerSys SPRL	Belgium
EnerSystem do Brazil Ltda.	Brazil
EnerSys Participacoes Ltda.	Brazil
Industrial Battery Holding S.A.	Brazil
EnerSys AD	Bulgaria
EnerSys Canada Inc.	Canada
EnerSys Cayman Euro L.P.	Cayman Islands
EnerSys Cayman Holdings L.P.	Cayman Islands
EnerSys Cayman Inc.	Cayman Islands
EnerSys Cayman L.P.	Cayman Islands
YCI, Inc.	Cayman Islands
EnerSystem Chile Ltda.	Chile
EnerSys (Chaozhou) Huada Batteries Company Limited	China
EnerSys (China) Huada Batteries Company Limited	China
EnerSys (Chongqing) Huada Batteries Company Limited	China
EnerSys (Jiangsu) Huada Batteries Company Limited *	China
Shenzhen Huada Power Supply Mechanical & Electrical Co. Ltd.*	China
EnerSys s.r.o.	Czech Republic
EnerSys A/S	Denmark
EnerSys Europe Oy	Finland
EnerSys S.à.r.l.	France
GAZ GmbH	Germany
Hawker GmbH	Germany
EAS Germany GmbH *	Germany
EnerSys AE	Greece
EnerSys Asia Limited	Hong Kong
EnerSys Hungária Kft.	Hungary
Energy Leader Batteries India Private Ltd. *	India
EnerSys Battery Private Limited	India
EnerSys S.r.l.	Italy
EnerSys Holdings (Luxembourg) S.à.r.l.	Luxembourg
EnerSys Luxembourg Finance S.à.r.l.	Luxembourg
EnerSys de Mexico, S.A. de CV	Mexico
Powersonic, S.A. de CV	Mexico
Yecoltd, S. de R.L. de CV	Mexico
EnerSys AS	Norway
EnerSys sp. z o.o.	Poland
Powersafe Acumuladores Industrialis Unipessoal, Lda.	Portugal
EnerSys CJSC	Russia
EnerSys Reserve Power Pte. Ltd.	Singapore
EnerSys s.r.o.	Slovak Republic
Battech (Pty) Ltd. *	South Africa
Battery Technologies (Pty) Ltd. *	South Africa
Acumuladores Industriales EnerSys SA	Spain
EnerSys AB	Sweden
EH Batterien AG	Switzerland
EH Europe GmbH	Switzerland
EnerSys BV	The Netherlands
EnerSys Assad S.à.r.l. *	Tunisia
ABSL Power Solutions Ltd.	United Kingdom
AGM Batteries Limited	United Kingdom
EnerSys Holdings UK Ltd.	United Kingdom

Subsidiary	Jurisdiction of Incorporation or Organization
EnerSys Ltd.	United Kingdom
ABSL Power Solutions Inc.	Delaware
EnerSys Advanced Systems Inc.	Delaware
EnerSys Capital Inc.	Delaware
EnerSys Delaware Inc.	Delaware
EnerSys Delaware LLC I	Delaware
EnerSys Delaware LLC II	Delaware
EnerSys Delaware LLC III	Delaware
EnerSys Delaware LLC IV	Delaware
EnerSys Energy Products Inc.	Delaware
EnerSys European Holding Co.	Delaware
EnerSys Mexico Holding Co. I	Delaware
EnerSys Mexico Holding Co. II	Delaware
Esfinco, Inc.	Delaware
Esrmco, Inc.	Delaware
Hawker Powersource, Inc.	Delaware
Hawker Power Systems, Inc.	Delaware
Modular Energy Devices, Inc.	Delaware
New Pacifico Realty, Inc.	Nevada

* These entities are majority-owned by EnerSys with the remaining interests held by third parties.

EX-23.1

Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the following Registration Statements:

(1) Registration Statement (Form S-8 No. 333-168717) pertaining to the EnerSys 2010 Equity Incentive Plan,

(2) Registration Statement (Form S-3 No. 333-151000) of EnerSys,

(3) Registration Statement (Form S-8 No. 333-143209) pertaining to the EnerSys 2006 Equity Incentive Plan, and

(4) Registration Statement (Form S-8 No. 333-120660) pertaining to the EnerSys Employee Stock Purchase Plan and EnerSys 2004 Equity Incentive Plan,

of our reports dated May 25, 2012, with respect to the consolidated financial statements and schedule of EnerSys and the effectiveness of internal control over financial reporting of EnerSys, included in this Annual Report (Form 10-K) of EnerSys for the year ended March 31, 2012.

/s/ Ernst & Young LLP

Philadelphia, Pennsylvania

May 25, 2012

EX-31.1

EXHIBIT 31.1

CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER

PURSUANT TO RULE 13A-14(A)/15D-14(A) UNDER THE SECURITIES EXCHANGE ACT OF 1934

I, John D. Craig, certify that:

1. I have reviewed this Annual Report on Form 10-K of EnerSys;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements and other financial information included in this report fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures and internal controls over financial reporting for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting, which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

ENERSYS
By	/s/ John D. Craig
	John D. Craig
	Chairman, President and Chief Executive Officer

Date: May 25, 2012

EX-31.2

EXHIBIT 31.2

CERTIFICATION OF THE CHIEF FINANCIAL OFFICER

PURSUANT TO RULE 13A-14(A)/15D-14(A) UNDER THE SECURITIES EXCHANGE ACT OF 1934

I, Michael J. Schmidtlein, certify that:

1. I have reviewed this Annual Report on Form 10-K of EnerSys;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements and other financial information included in this report fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures and internal controls over financial reporting for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting, which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

ENERSYS
By	/s/ Michael J. Schmidtlein
	Michael J. Schmidtlein
	Senior Vice President Finance and Chief Financial Officer

Date: May 25, 2012

EX-32.1

EXHIBIT 32.1

CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER

AND CHIEF FINANCIAL OFFICER

PURSUANT TO

18. U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Annual Report of EnerSys on Form 10-K for the fiscal year ended March 31, 2012 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that information contained in such Form 10-K fairly presents, in all material respects, the financial condition and results of operations of EnerSys.

ENERSYS
By	/s/ John D. Craig
	John D. Craig
	Chairman, President and Chief Executive Officer
By	/s/ Michael J. Schmidtlein
	Michael J. Schmidtlein
	Senior Vice President, Finance and Chief Financial Officer

Date: May 25, 2012

XML

Accrued Expenses (Tables)

12 Months Ended

Mar. 31, 2012

Accrued Expenses [Abstract]

Summary Of Accrued Expenses

	March 31,
	2012		2011
Payroll and benefits	$	55,595	$	58,794
Accrued selling expenses		26,269		24,257
Warranty		19,274		16,218
Income taxes payable		16,979		15,591
VAT and other non-income taxes		10,966		11,937
Freight		12,314		10,208
Deferred income		12,057		7,107
Interest rate swaps		3,628		—
Interest		2,040		2,471
Pension and social security		1,696		1,854
Restructuring		1,186		5,323
Other		26,399		30,940
Total	$	188,403	$	184,700

XML

Stock-Based Compensation (Summary Of The Changes In Restricted Stock Units And Market Share Units) (Details) (Restricted Stock Units (RSU) / Market Share Units (MSU) [Member], USD $)	12 Months Ended
	Mar. 31, 2012
Restricted Stock Units (RSU) / Market Share Units (MSU) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSU and MSU, Non-vested awards, Beginning Balance	865,392
Number of RSU and MSU, Granted	364,395
Number of RSU and MSU, Vested	(259,151)
Number of RSU and MSU, Cancelled	(6,833)
Number of RSU and MSU, Non-vested awards, Ending Balance	963,803
Weighted Average Grant Date Fair Value, Non-vested awards, Beginning Balance	$ 23.97
Weighted Average Grant Date Fair Value, Granted	$ 40.76
Weighted Average Grant Date Fair Value, Vested	$ 22.28
Weighted Average Grant Date Fair Value, Canceled	$ 11.49
Weighted Average Grant Date Fair Value, Non-vested awards, Ending Balance	$ 30.84

XML

Quarterly Financial Data (Tables)

12 Months Ended

Mar. 31, 2012

Quarterly Financial Data [Abstract]

Summary Of Interim Financial Information

	1st Quarter		2nd Quarter		3rd Quarter		4th Quarter		Fiscal Year
Fiscal year ended March 31, 2012
Net sales	$	569,229	$	547,140	$	574,246	$	592,754	$	2,283,369
Gross profit		121,971		114,395		130,876		145,463		512,705
Operating earnings(1)		48,715		42,440		53,777		65,879		210,811
Net earnings		33,496		28,289		36,859		45,323		143,967
Net earnings attributable to EnerSys stockholders		33,496		28,289		36,859		45,359		144,003
Net earnings per common share attributable to EnerSys stockholders—basic	$	0.67	$	0.57	$	0.77	$	0.95	$	2.95
Net earnings per common share attributable to EnerSys stockholders—diluted	$	0.66	$	0.57	$	0.77	$	0.94	$	2.93

Fiscal year ended March 31, 2011
Net sales	$	434,969	$	472,843	$	508,596	$	548,054	$	1,964,462
Gross profit		96,614		110,721		117,900		124,609		449,844
Operating earnings(2)		37,480		44,496		48,320		53,518		183,814
Net earnings(3)		23,027		26,549		33,759		30,091		113,426
Net earnings attributable to EnerSys stockholders		23,027		26,549		33,759		30,091		113,426
Net earnings per common share attributable to EnerSys stockholders—basic	$	0.47	$	0.54	$	0.68	$	0.60	$	2.30
Net earnings per common share attributable to EnerSys stockholders—diluted	$	0.47	$	0.53	$	0.67	$	0.59	$	2.27

(1) Included in Operating earnings were restructuring charges of $410, $902, $1,440 and $2,236 for the first, second, third and fourth quarters of fiscal 2012, respectively. Operating earnings also included a legal proceedings settlement income of $900, in the second quarter of fiscal 2012.

(2) Included in Operating earnings were restructuring charges of $723, $2,750, $1,754 and $1,586 for the first, second, third and fourth quarters of fiscal 2011, respectively.

(3) Included in Net earnings of fiscal 2011 were charges related to refinancing of $8,155 in the fourth quarter of fiscal 2011.

XML

Stock-Based Compensation (Tables)

12 Months Ended

Mar. 31, 2012

Stock-Based Compensation [Abstract]

Summary Of Weighted Average Fair Value Of Options Granted

	2010			2010
	10 Year Options			3.5 Year Options
Exercise price	$	16.20		$	16.24
Risk-free interest rate		2.01	%		0.93	%
Dividend yield		0	%		0	%
Expected life		5years			2years
Expected volatility		56.6	%		56.6	%
Weighted average fair value	$	8.35		$	5.15

Summary Of Stock Option Activity

	Number of Options			Weighted Average Remaining Contract Term (Years)		Weighted Average Exercise Price		Aggregate Intrinsic Value
Options outstanding as of March 31, 2009		2,643,175			4.2	$	16.70	$	1,752
Granted		539,506					16.21		—
Exercised		(667,862	)				12.22		7,125
Canceled		(83,586	)				21.43		522
Options outstanding as of March 31, 2010		2,431,233			4.0	$	17.69	$	19,191
Exercised		(1,415,391	)				15.34		18,482
Canceled		(155,063	)				29.32		9
Options outstanding as of March 31, 2011		860,779			6.2	$	19.52	$	17,129
Exercised		(227,116	)				15.82		3,691
Options outstanding as of March 31, 2012		633,663			6.1	$	20.85	$	8,879
Options exercisable as of March 31, 2012		523,626			5.9	$	21.82	$	6,826
Options expected to vest after March 31, 2012		110,037			7.1	$	16.20	$	2,053

Summary Of Information Regarding Stock Options Outstanding And Exercisable

	Options Outstanding						Options Exercisable
Range of Exercise Prices	Number of Options		Weighted Average Remaining Contractual Life		Weighted Average Exercise Price		Number of Options		Weighted Average Exercise Price
$10.01-15.00		65,954		3.1	$	14.12		65,954	$	14.12
$15.01-20.00		361,661		6.6		16.75		251,624		16.99
Over $20.00		206,048		6.1		30.19		206,048		30.19
		633,663		6.1	$	20.85		523,626	$	21.82

Summary Of Changes Of Non-Vested Options

	Number of Options			Weighted Average Grant-Date Fair Value
Nonvested at March 31, 2011		357,903		$	8.70
Vested		(247,866	)		9.06
Nonvested at March 31, 2012		110,037		$	7.87

Summary Of The Changes In Restricted Stock Units And Market Share Units

	Restricted Stock Units (RSU) / Market Share Units  (MSU)
	Number of RSU and  MSU			Weighted Average Grant Date Fair Value
Non-vested awards as of March 31, 2011		865,392		$	23.97
Granted		364,395			40.76
Vested		(259,151	)		22.28
Canceled		(6,833	)		11.49
Non-vested awards as of March 31, 2012		963,803		$	30.84

XML

Other (Income) Expense, Net And Charges Related To Refinancing (Summary Of Charges Related To Refinancing) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Other (Income) Expense, Net And Charges Related To Refinancing [Abstract]
Charges related to refinancing	$ 8,155		$ 8,155

XML

Debt (Deferred Financing Fees) (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Debt [Abstract]
Write-off of unamortized deferred financing fees		$ 2,308
New deferred financing fees		3,500
Deferred financing fees, net of accumulated amortization	4,634	5,912
Amortization expense included in interest expense	$ 1,278	$ 1,861	$ 1,724

XML

Quarterly Financial Data (Summary Of Interim Financial Information) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Mar. 31, 2012		Jan. 01, 2012		Oct. 02, 2011		Jul. 03, 2011		Mar. 31, 2011		Jan. 02, 2011		Oct. 03, 2010		Jul. 04, 2010		Mar. 31, 2012		Mar. 31, 2011		Mar. 31, 2010
Quarterly Financial Data [Abstract]
Net sales	$ 592,754		$ 574,246		$ 547,140		$ 569,229		$ 548,054		$ 508,596		$ 472,843		$ 434,969		$ 2,283,369		$ 1,964,462		$ 1,579,385
Gross profit	145,463	[1]	130,876	[1]	114,395	[1]	121,971	[1]	124,609		117,900		110,721		96,614		512,705	[1]	449,844		360,904
Operating earnings	65,879	[2]	53,777	[2]	42,440	[2]	48,715	[2]	53,518	[1]	48,320	[1]	44,496	[1]	37,480	[1]	210,811	[2],[3]	183,814	[1],[3]	114,297	[3]
Net earnings	45,323		36,859		28,289		33,496		30,091	[4]	33,759	[4]	26,549	[4]	23,027	[4]	143,967		113,426	[4]	62,304
Net earnings attributable to EnerSys stockholders	45,359		36,859		28,289		33,496		30,091		33,759		26,549		23,027		144,003		113,426		62,304
Net earnings per common share attributable to EnerSys stockholders-basic	$ 0.95		$ 0.77		$ 0.57		$ 0.67		$ 0.60		$ 0.68		$ 0.54		$ 0.47		$ 2.95		$ 2.30		$ 1.29
Net earnings per common share attributable to EnerSys stockholders-diluted	$ 0.94		$ 0.77		$ 0.57		$ 0.66		$ 0.59		$ 0.67		$ 0.53		$ 0.47		$ 2.93		$ 2.27		$ 1.28
Restructuring charges	2,236		1,440		902		410		1,586		1,754		2,750		723		4,988		6,813		13,929
Legal proceedings settlement income					900												900
Charges related to refinancing									$ 8,155										$ 8,155

[1] Included in Operating earnings were restructuring charges of $723, $2,750, $1,754 and $1,586 for the first, second, third and fourth quarters of fiscal 2011, respectively.

[2] Included in Operating earnings were restructuring charges of $410, $902, $1,440 and $2,236 for the first, second, third and fourth quarters of fiscal 2012, respectively. Operating earnings also included a legal proceedings settlement income of $900, in the second quarter of fiscal 2012.

[3] The Company does not allocate interest expense or other (income) expense to the reportable segments.

[4] Included in Net earnings of fiscal 2011 were charges related to refinancing of $8,155 in the fourth quarter of fiscal 2011.

XML

Summary Of Significant Accounting Policies (Details) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2012 USD ($) Y	Mar. 31, 2012 Buildings And Improvements [Member] Y	Mar. 31, 2012 Machinery And Equipment [Member] Y	Mar. 31, 2012 Maximum [Member]	Mar. 31, 2012 Maximum [Member] Reserve Power Batteries [Member]	Mar. 31, 2012 Maximum [Member] Motive Power Batteries [Member]	Mar. 31, 2012 Minimum [Member]	Mar. 31, 2012 Minimum [Member] Reserve Power Batteries [Member]	Mar. 31, 2012 Minimum [Member] Motive Power Batteries [Member]	Mar. 31, 2012 Restricted Stock And Restricted Stock Units [Member]	Mar. 31, 2012 2011 Senior Secured Revolving Credit Facility [Member] USD ($)	Mar. 29, 2011 2011 Senior Secured Revolving Credit Facility [Member] USD ($)	Mar. 31, 2012 China Term Loan [Member] CNY	Mar. 31, 2011 China Term Loan [Member] USD ($)	Mar. 31, 2011 China Term Loan [Member] CNY	Mar. 31, 2012 Senior Unsecured 3.375% Convertible Notes Due 2038 [Member] USD ($)	Mar. 31, 2012 India Term Loan [Member] INR
Summary Of Significant Accounting Policies [Line Items]
Product warranty for a period					20 years	7 years		1 year	1 year
Property, plant, and equipment, useful life, minimum (in years)		10	3
Property, plant, and equipment, useful life, maximum (in years)		33	15
Estimated useful lives of finite-lived assets, minimum (in years)	3
Estimated useful lives of finite-lived assets, maximum (in years)	20
Fair value of Company's new senior secured revolving credit facility											$ 350,000	$ 350,000	75,000	$ 11,909	75,000		273,780
Interest rate of debt instrument													7.26%			3.375%	15.10%
Convertible Notes	$ 172,500															$ 172,500
Recognizes the largest amount of the benefit that is greater realized upon ultimate settlement, percentage							50.00%
Market share units converted into common stock for each unit				2			0
Percentage of restricted stock units granted, vested per year										25.00%
Vesting period, in years										4 years

XML

Fair Value Of Financial Instruments (Financial Assets And (Liabilities), Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	$ (3,941)	$ 1,137
Quoted Price In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	(3,941)	1,137
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives
Interest Rate Swap Agreements [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	(3,872)	(5,847)
Interest Rate Swap Agreements [Member] | Quoted Price In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives
Interest Rate Swap Agreements [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	(3,872)	(5,847)
Interest Rate Swap Agreements [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives
Lead Hedge Forward Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	(851)	9,575
Lead Hedge Forward Contracts [Member] | Quoted Price In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives
Lead Hedge Forward Contracts [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	(851)	9,575
Lead Hedge Forward Contracts [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives
Foreign Currency Forward Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	782	(2,591)
Foreign Currency Forward Contracts [Member] | Quoted Price In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives
Foreign Currency Forward Contracts [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	782	(2,591)
Foreign Currency Forward Contracts [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives

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Stockholders' Equity (Change In Number Of Shares Of Common Stock Outstanding) (Details)	12 Months Ended
	Mar. 31, 2012
Stockholders' Equity [Abstract]
Shares outstanding as of March 31, 2011	50,034,353
Repurchase of common shares	(2,646,885)
Shares issued as part of equity-based compensation plans, net of equity awards surrendered for option price and taxes	412,661
Shares outstanding as of March 31, 2012	47,800,129

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Retirement Plans (Tables)

12 Months Ended

Mar. 31, 2012

Retirement Plans [Abstract]

Components Of Net Periodic Pension Cost

	United States Plans									International Plans
	Fiscal Year Ended March 31,									Fiscal Year Ended March 31,
	2012			2011			2010			2012			2011			2010
Service cost	$	285		$	250		$	224		$	645		$	603		$	621
Interest cost		668			646			635			2,504			2,503			2,520
Expected return on plan assets		(706	)		(624	)		(491	)		(1,787	)		(1,615	)		(1,256	)
Amortization and deferral		238			248			458			32			53			(43	)
Net periodic benefit cost	$	485		$	520		$	826		$	1,394		$	1,544		$	1,842

Summary Of Change In Projected Benefit Obligation

	United States Plans						International Plans
	March 31,						March 31,
	2012			2011			2012			2011
Change in projected benefit obligation
Benefit obligation at the beginning of the period	$	11,903		$	10,992		$	48,881		$	46,851
Service cost		285			250			645			603
Interest cost		668			646			2,504			2,503
Benefits paid, inclusive of plan expenses		(615	)		(581	)		(1,709	)		(1,481	)
Plan settlements		—			—			(40	)		—
Plan amendments		—			108			—			817
Plan combinations (including newly material plans)		—			—			—			337
Experience (gain) loss		1,799			488			5,442			(3,366	)
Foreign currency translation adjustment		—			—			(1,828	)		2,617
Benefit obligation at the end of the period	$	14,040		$	11,903		$	53,895		$	48,881

Summary Of Change In Plan Assets

	United States Plans						International Plans
	March 31,						March 31,
	2012			2011			2012			2011
Change in plan assets
Fair value of plan assets at the beginning of the period	$	8,746		$	7,859		$	25,779		$	22,712
Actual return on plan assets		420			1,102			1,555			1,751
Employer contributions		641			366			1,505			1,424
Benefits paid, inclusive of plan expenses		(615	)		(581	)		(1,709	)		(1,481	)
Plan settlements		—			—			(40	)		—
Foreign currency translation adjustments		—			—			(148	)		1,373
Fair value of plan assets at the end of the period	$	9,192		$	8,746		$	26,942		$	25,779
Funded status deficit	$	(4,848	)	$	(3,157	)	$	(26,953	)	$	(23,102	)

Summary Of Amounts Recognized In The Balance Sheet

	March 31,
	2012			2011
Amounts recognized in the consolidated balance sheets consist of:
Other assets	$	260		$	2,513
Accrued expenses		(1,309	)		(1,369	)
Other liabilities		(30,752	)		(27,403	)
	$	(31,801	)	$	(26,259	)

Summary Of Amounts Recorded In AOCI Before Taxes

	March 31,
	2012			2011			2010
Amounts recorded in AOCI before taxes:
Prior service credit (cost)	$	(922	)	$	(1,054	)	$	(132	)
Net gain (loss)		(11,176	)		(3,712	)		(7,344	)
Net amount recognized	$	(12,098	)	$	(4,766	)	$	(7,476	)

Summary Of Changes In AOCI

	March 31,
	2012			2011			2010
Changes in plan assets and benefit obligations:
New prior service cost	$	—		$	905		$	—
Net loss /(gain) arising during the year		7,757			(3,505	)		753
Effect of exchange rates on amounts included in AOCI		(176	)		151			40
Amounts recognized as a component of net periodic benefit costs:
Amortization or curtailment recognition of prior service credit /(cost)		(83	)		(62	)		(142	)
Amortization or settlement recognition of net gain/(loss)		(187	)		(250	)		(333	)
Total recognized in other comprehensive income	$	7,311		$	(2,761	)	$	318

Summary Of Recognized Components Of Net Periodic Pension Cost Included In Accumulated Other Comprehensive Income

Net loss	$	(81	)
Net prior service cost		(534	)
Net amount expected to be recognized	$	(615	)

Summary Of Accumulated Benefit Obligation Related To All Defined Pension Plans

	United States Plans				International Plans
	March 31,				March 31,
	2012		2011		2012		2011
All defined benefit plans:
Accumulated benefit obligation	$	14,040	$	11,903	$	50,416	$	46,225
Unfunded defined benefit plans:
Projected benefit obligation		—		—		26,892		25,533
Accumulated benefit obligation		—		—		25,508		24,413
Defined benefit plans with an accumulated benefit obligation in excess of the fair value of plan assets:
Projected benefit obligation		14,040		11,903		28,003		25,560
Accumulated benefit obligation		14,040		11,903		26,445		24,440
Fair value of plan assets		9,192		8,746		789		—

Significant Assumptions Used To Determine The Net Periodic Benefit Cost

	United States Plans									International Plans
	March 31,									March 31,
	2012			2011			2010			2012			2011			2010
Discount rate		5.7	%		6.0	%		6.5	%		4.0-5.5	%		4.3-6.0	%		3.8-6.0	%
Expected return on plan assets		8.0			8.0			8.0			5.5-7.0			5.5-7.0			5.5-7.0
Rate of compensation increase		N/A			N/A			N/A			2.0-4.0			2.0-3.5			2.0-3.5

Significant Assumptions Used To Determine The Projected Benefit Obligations

	United States Plans						International Plans
	March 31,						March 31,
	2012			2011			2012			2011
Discount rate		4.8	%		5.7	%		2.5-5.5	%		4.0-5.5	%
Expected return on plan assets		8.0			8.0			5.5-7.0			5.5-7.0
Rate of compensation increase		N/A			N/A			2.0-4.0			2.0-4.0

Summary Of Pension Plan Investments Measured At Fair Value

	March 31, 2012
	United States Plans								International Plans
	Total Fair Value Measurement		Quoted Price In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Fair Value Measurement		Quoted Price In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Asset Category:
Cash and Cash Equivalents	$	868	$	868	$	—	$	—	$	—	$	—	$	—	$	—
Equity Securities
US(a)		5,067		5,067		—		—		2,742		2,742		—		—
International(b)		837		837		—		—		14,728		14,728		—		—
Fixed Income(c)		2,420		2,420		—		—		9,472		9,472		—		—
Total	$	9,192	$	9,192	$	—	$	—	$	26,942	$	26,942	$	—	$	—

	March 31, 2011
	United States Plans								International Plans
	Total Fair Value Measurement		Quoted Price In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Fair Value Measurement		Quoted Price In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Asset Category:
Cash and Cash Equivalents	$	528	$	528	$	—	$	—	$	—	$	—	$	—	$	—
Equity Securities
US(a)		4,839		4,839		—		—		2,521		2,521		—		—
International(b)		840		840		—		—		13,600		13,600		—		—
Fixed Income(c)		2,539		2,539		—		—		9,658		9,658		—		—
Total	$	8,746	$	8,746	$	—	$	—	$	25,779	$	25,779	$	—	$	—

(a) US equities include companies that are well diversified by industry sector and equity style (i.e., growth and value strategies). Active and passive management strategies are employed. Investments are primarily in large capitalization stocks and, to a lesser extent, mid- and small-cap stocks.

(b) International equities are invested in companies that are traded on exchanges outside the U.S. and are well diversified by industry sector, country and equity style. Active and passive strategies are employed. The vast majority of the investments are made in companies in developed markets with a small percentage in emerging markets.

(c) Fixed income consists primarily of investment grade bonds from diversified industries.

Summary Of Estimated Future Benefit Payments

	Pension Benefits
2013	$	2,173
2014		2,319
2015		2,445
2016		2,674
2017		2,993
Years 2018-2022		17,281

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Valuation And Qualifying Accounts

12 Months Ended

Mar. 31, 2012

Valuation And Qualifying Accounts [Abstract]

Valuation And Qualifying Accounts

EnerSys

Valuation and Qualifying Accounts

(In Thousands)

	Balance at Beginning of Period		Additions Charged to Expense		Charge-Offs			Purchase accounting adjustments		Other(1)			Balance at End  of Period
Allowance for doubtful accounts:
Fiscal year ended March 31, 2010	$	7,978	$	2,712	$	(1,257	)	$	—	$	446		$	9,879
Fiscal year ended March 31, 2011		9,879		1,513		(1,673	)		—		828			10,547
Fiscal year ended March 31, 2012		10,547		1,395		(2,012	)		—		92			10,022
Allowance for inventory valuation:
Fiscal year ended March 31, 2010	$	16,725	$	1,704	$	(7,437	)	$	—	$	686		$	11,678
Fiscal year ended March 31, 2011		11,678		8,329		(5,361	)		—		406			15,052
Fiscal year ended March 31, 2012		15,052		7,659		(7,657	)		—		(223	)		14,831
Deferred tax asset—valuation allowance:
Fiscal year ended March 31, 2010	$	57,397	$	894	$	(2,896	)	$	—	$	2,987		$	58,382
Fiscal year ended March 31, 2011		58,382		825		(2,444	)		5,340		1,514			63,617
Fiscal year ended March 31, 2012		63,617		2,457		(7,528	)		1,124		(3,311	)		56,359

(1) Primarily the impact of currency changes.

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Fair Value Of Financial Instruments (Carrying Amounts And Estimated Fair Values Of Company's Financial Instruments) (Details) (USD $)	Mar. 31, 2012		Mar. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives assets, Carrying Amount	$ 782,000	[1]	$ 9,575,000	[1]
Derivatives assets, Fair Value	782,000	[1]	9,575,000	[1]
Derivatives liabilities, Carrying Amount	4,723,000	[1]	8,438,000	[1]
Derivatives liabilities, Fair Value	4,723,000	[1]	8,438,000	[1]
Convertible Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Convertible Notes, Carrying Amount	148,272,000	[2]	141,837,000	[2]
Convertible Notes, Fair Value	200,100,000	[3]	215,625,000	[3]
Face value of debt instrument	$ 172,500		$ 172,500

[1] Represents interest rate swap agreements, lead and foreign currency hedges (see Note 12 for asset and liability positions of the interest rate swap agreements, lead and foreign currency hedges at March 31, 2012 and March 31, 2011).

[2] The carrying amounts of the Convertible Notes at March 31, 2012 and March 31, 2011 represent the $172,500 principal value, less the unamortized debt discount (see Note 8).

[3] The fair value amounts of the Convertible Notes represent the trading values of the Convertible Notes with a principal value of $172,500 at March 31, 2012 and March 31, 2011.

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Warranty (Analysis Of Changes In Liability For Product Warranties) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Warranty [Abstract]
Balance at beginning of period	$ 36,006	$ 31,739	$ 30,914
Current year provisions	26,841	20,565	13,123
Costs incurred	(20,185)	(17,499)	(13,283)
Foreign exchange and other	(595)	1,201	985
Balance at end of period	$ 42,067	$ 36,006	$ 31,739

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Debt (Summary Of Aggregate Maturities Of Long-Term Debt) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012
Debt [Abstract]
2013	$ 2,540
2014	2,450
2015	2,450
2016	254,350
2017	1,567
Thereafter
Net carrying amount	$ 263,357

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Income Taxes (Reconciliation Of Unrecognized Tax Benefits) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Income Taxes [Abstract]
Unrecognized tax benefits, beginning balance	$ 10,645	$ 10,750	$ 13,305
Increases related to current year tax positions	5,032	2,896	919
Increases related to prior year tax positions due to foreign currency translation	(28)	122	5
Increases related to prior year tax positions	182	324
Decreases related to prior year tax position settled		(3,145)	(2,940)
Lapse of statute of limitations	(2,886)	(302)	(539)
Unrecognized tax benefits, ending balance	$ 12,945	$ 10,645	$ 10,750

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Inventories (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
Inventories [Abstract]
Inventory reserves for obsolescence and other estimated losses	$ 14,831	$ 15,052

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Stock-Based Compensation (Summary Of Stock Option Activity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2012 Y	Mar. 31, 2011 Y	Mar. 31, 2010 Y
Stock-Based Compensation [Abstract]
Number of Options outstanding, Beginning Balance	860,779	2,431,233	2,643,175
Number of Options, Granted			539,506
Number of Options, Exercised	(227,116)	(1,415,391)	(667,862)
Number of Options, Canceled		(155,063)	(83,586)
Number of Options outstanding, Ending Balance	633,663	860,779	2,431,233
Options outstanding, Weighted Average Remaining Contract Term, Beginning Balance	6.2	4.0	4.2
Options outstanding, Weighted Average Exercise Price, Beginning Balance	$ 19.52	$ 17.69	$ 16.70
Weighted Average Exercise Price, Granted			$ 16.21
Weighted Average Exercise Price, Exercised	$ 15.82	$ 15.34	$ 12.22
Weighted Average Exercise Price, Canceled		$ 29.32	$ 21.43
Options outstanding, Weighted Average Exercise Price, Ending Balance	$ 20.85	$ 19.52	$ 17.69
Options outstanding, Weighted Average Remaining Contract Term, Ending Balance	6.1	6.2	4.0
Options outstanding, Aggregate Intrinsic Value, Beginning Balance	$ 17,129	$ 19,191	$ 1,752
Aggregate Intrinsic Value, Exercised	3,691	18,482	7,125
Aggregate Intrinsic Value, Canceled		9	522
Options outstanding, Aggregate Intrinsic Value, Ending Balance	8,879	17,129	19,191
Options exercisable, Number of Options, Ending Balance	523,626
Options exercisable, Weighted Average Remaining Contract Term, Ending Balance	5.9
Options exercisable, Weighted Average Exercise Price, Ending Balance	$ 21.82
Options exercisable, Aggregate Intrinsic Value, Ending Balance	6,826
Options expected to vest, Number of Options, Ending Balance	110,037
Options expected to vest, Weighted Average Remaining Contract Term, Ending Balance	7.1
Options expected to vest, Weighted Average Exercise Price, Ending Balance	$ 16.20
Options expected to vest, Aggregate Intrinsic Value, Ending Balance	$ 2,053

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Other Liabilities (Schedule Of Other Long-Term Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
Other Liabilities [Abstract]
Pension and profit sharing obligation	$ 35,804	$ 29,297
Warranty	22,793	19,788
Long-term income taxes liabilities	13,520	11,320
Deferred income	6,094	3,839
Interest rate swap liabilities	244	5,847
Other	14,013	6,552
Total	$ 92,468	$ 76,643

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Income Taxes (Earnings Before Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Income Taxes [Abstract]
United States	$ 87,597	$ 57,710	$ 37,418
Foreign	103,662	93,734	49,837
Earnings before income taxes	$ 191,259	$ 151,444	$ 87,255

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Derivative Financial Instruments (Fair Value Of Derivative Instruments In The Consolidated Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012		Mar. 31, 2011
Derivatives, Fair Value [Line Items]
Derivatives assets, Fair Value	$ 782	[1]	$ 9,575	[1]
Derivatives liabilities, Fair Value	4,723	[1]	8,438	[1]
Designated As Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivatives assets, Fair Value	700		9,575
Derivatives liabilities, Fair Value	881		2,591
Designated As Hedging Instrument [Member] | Prepaid And Other Current Assets [Member] | Lead Hedge Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivatives assets, Fair Value			9,575
Designated As Hedging Instrument [Member] | Prepaid And Other Current Assets [Member] | Foreign Currency Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivatives assets, Fair Value	670
Designated As Hedging Instrument [Member] | Prepaid And Other Current Assets [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivatives assets, Fair Value	30
Designated As Hedging Instrument [Member] | Accrued Expenses [Member] | Lead Hedge Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivatives liabilities, Fair Value	881
Designated As Hedging Instrument [Member] | Accrued Expenses [Member] | Foreign Currency Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivatives liabilities, Fair Value			2,591
Not Designated As Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivatives assets, Fair Value	112
Derivatives liabilities, Fair Value	3,872		5,847
Not Designated As Hedging Instrument [Member] | Prepaid And Other Current Assets [Member] | Lead Hedge Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivatives assets, Fair Value
Not Designated As Hedging Instrument [Member] | Prepaid And Other Current Assets [Member] | Foreign Currency Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivatives assets, Fair Value	112
Not Designated As Hedging Instrument [Member] | Prepaid And Other Current Assets [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivatives assets, Fair Value
Not Designated As Hedging Instrument [Member] | Accrued Expenses [Member] | Lead Hedge Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivatives liabilities, Fair Value
Not Designated As Hedging Instrument [Member] | Accrued Expenses [Member] | Foreign Currency Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivatives liabilities, Fair Value
Not Designated As Hedging Instrument [Member] | Accrued Expenses [Member] | Interest Rate Swap Agreements [Member]
Derivatives, Fair Value [Line Items]
Derivatives liabilities, Fair Value	3,628
Not Designated As Hedging Instrument [Member] | Other Liabilities [Member] | Interest Rate Swap Agreements [Member]
Derivatives, Fair Value [Line Items]
Derivatives liabilities, Fair Value	$ 244		$ 5,847

[1] Represents interest rate swap agreements, lead and foreign currency hedges (see Note 12 for asset and liability positions of the interest rate swap agreements, lead and foreign currency hedges at March 31, 2012 and March 31, 2011).

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Income Taxes (Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
Income Taxes [Abstract]
Accounts receivable	$ 1,111	$ 1,304
Inventories	6,707	6,669
Net operating loss carryforwards	71,773	78,236
Accrued liabilities	26,997	22,061
Other assets	10,228	9,200
Gross deferred tax assets	116,816	117,470
Less valuation allowance	(56,359)	(63,617)
Total deferred tax assets	60,457	53,853
Property, plant and equipment	30,957	31,945
Other intangible assets	46,628	43,440
Convertible Notes	21,616	20,727
Other liabilities	2,400	4,992
Total deferred tax liabilities	101,601	101,104
Net deferred tax liabilities	$ (41,144)	$ (47,251)

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Fair Value Of Financial Instruments (Narrative) (Details) (Convertible Notes [Member], USD $)	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Convertible Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Face value of debt instrument	$ 172,500	$ 172,500
Price of stock per share when Convertible Notes were issued	$ 30.19
Closing price of stock	$ 34.65
Conversion option price per share	$ 40.60
Trading of Convertible Notes, face value, disclosed as a percentage	116.00%	125.00%
Unamortized discount	$ 24,228,000	$ 30,663,000

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Debt (Schedule Of Long-Term Debt) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Debt Instrument [Line Items]
Long-term debt	$ 239,129	$ 247,992
Less current portion	2,540	43
Long-term Debt, Excluding Current Maturities	236,589	247,949
Senior Unsecured 3.375% Convertible Notes Due 2038 [Member]
Debt Instrument [Line Items]
Long-term debt	148,272	141,837
Interest rate of debt instrument	3.375%
Maturity year	2038
2011 Credit Facility Due 2016 [Member]
Debt Instrument [Line Items]
Long-term debt	79,400	100,000
Maturity year	2016
China Term Loan [Member]
Debt Instrument [Line Items]
Long-term debt	6,034	6,112
Interest rate of debt instrument	7.26%
Maturity year	2017
India Term Loan [Member]
Debt Instrument [Line Items]
Long-term debt	5,383
Interest rate of debt instrument	15.10%
Maturity year	2017
Other [Member]
Debt Instrument [Line Items]
Long-term debt	$ 40	$ 43

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Earnings Per Share

12 Months Ended

Mar. 31, 2012

Earnings Per Share [Abstract]

Earnings Per Share

18. Earnings Per Share

The following table sets forth the reconciliation from basic to diluted average common shares and the calculations of net earnings per common share.

	March 31,
	2012		2011		2010
Net earnings attributable to EnerSys stockholders	$	144,003	$	113,426	$	62,304
Average common shares:
Basic (weighted-average outstanding shares)		48,748,205		49,376,132		48,122,207
Dilutive potential common shares from exercise and lapse of equity awards, net of shares assumed reacquired		467,830		668,114		711,888
Diluted (weighted-average outstanding shares)		49,216,035		50,044,246		48,834,095
Basic earnings per common share attributable to EnerSys stockholders	$	2.95	$	2.30	$	1.29
Diluted earnings per common share attributable to EnerSys stockholders	$	2.93	$	2.27	$	1.28
Anti-dilutive equity awards not included in weighted average common shares — diluted		221,097		—		383,696

The aggregate number of shares that the Company could be obligated to issue upon conversion of its $172,500, Convertible Notes which the Company issued in May 2008, is approximately 4,248,761. It is the Company's current intent to settle the principal amount of any conversions in cash, and any additional conversion consideration in cash, shares of EnerSys common stock or a combination of cash and shares. No contingent shares were included in diluted shares outstanding during fiscal 2012, 2011 and 2010, as the specified conversion price exceeded the average market price of the Company's common stock, and the inclusion of contingent shares would have been anti-dilutive.

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Restructuring Plans (Tables)

12 Months Ended

Mar. 31, 2012

Acquisition Related Restructuring Reserve [Member]

Restructuring Cost and Reserve [Line Items]

Acquisition And Non-Acquisition Related Restructuring Reserve

	Employee Severance			Plant Closure and Other			Total
Balance at March 31, 2009	$	—		$	—		$	—
Accrued		1,269			—			1,269
Costs incurred		—			—			—
Foreign currency impact and other		23			—			23
Balance at March 31, 2010	$	1,292		$	—		$	1,292
Accrued		108			2,438			2,546
Costs incurred		(1,107	)		(2,313	)		(3,420	)
Foreign currency impact and other		(36	)		21			(15	)
Balance at March 31, 2011	$	257		$	146		$	403
Accrued		81			630			711
Costs incurred		(338	)		(776	)		(1,114	)
Balance at March 31, 2012	$	—		$	—		$	—

Non-Acquisition Related Restructuring Reserve [Member]

Restructuring Cost and Reserve [Line Items]

Acquisition And Non-Acquisition Related Restructuring Reserve

	Employee Severance			Plant Closure and Other			Total
Balance at March 31, 2009	$	10,289		$	—		$	10,289
Accrued		10,107			2,263			12,370
Costs incurred		(13,276	)		(2,263	)		(15,539	)
Foreign currency impact and other		362			—			362
Balance at March 31, 2010	$	7,482		$	—		$	7,482
Accrued		4,267			—			4,267
Costs incurred		(6,945	)		—			(6,945	)
Foreign currency impact and other		116			—			116
Balance at March 31, 2011	$	4,920		$	—		$	4,920
Accrual adjustment		(681	)		—			(681	)
Accrued		4,958			—			4,958
Costs incurred		(7,966	)		—			(7,966	)
Foreign currency impact and other		(45	)		—			(45	)
Balance at March 31, 2012	$	1,186		$	—		$	1,186

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Other Liabilities (Tables)

12 Months Ended

Mar. 31, 2012

Other Liabilities [Abstract]

Schedule Of Other Long-Term Liabilities

	March 31,
	2012		2011
Pension and profit sharing obligation	$	35,804	$	29,297
Warranty		22,793		19,788
Long-term income taxes liabilities		13,520		11,320
Deferred income		6,094		3,839
Interest rate swap liabilities		244		5,847
Other		14,013		6,552
Total	$	92,468	$	76,643

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Leases (Schedule Of Capital And Operating Leases) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
Leases [Abstract]
2013, Operating Leases	$ 18,268
2014, Operating Leases	13,478
2015, Operating Leases	10,108
2016, Operating Leases	6,981
2017, Operating Leases	5,008
Thereafter, Operating Leases	3,588
Total minimum lease payments, Operating Leases	57,431
2013, Capital Leases	451
2014, Capital Leases	475
2015, Capital Leases	84
2016, Capital Leases	14
2017, Capital Leases	7
Thereafter, Capital Leases
Total minimum lease payments, Capital Leases	1,031
Amounts representing interest	101
Net minimum lease payments, including current portion	930
Net minimum lease payments, current portion	$ 409	$ 819

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Retirement Plans (Summary Of Recognized Components Of Net Periodic Pension Cost Included In Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012
Retirement Plans [Abstract]
Net loss	$ (81)
Net prior service cost	(534)
Net amount expected to be recognized	$ (615)

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Goodwill And Other Intangible Assets (Tables)

12 Months Ended

Mar. 31, 2012

Goodwill And Other Intangible Assets [Abstract]

Schedule Of Company's Other Intangible Assets

	March 31,
	2012							2011
	Gross Amount		Accumulated Amortization			Net Amount		Gross Amount		Accumulated Amortization			Net Amount
Indefinite-lived intangible assets:
Trademarks	$	86,745	$	(953	)	$	85,792	$	83,021	$	(953	)	$	82,068
Finite-lived intangible assets:
Customer relationships		14,330		(2,839	)		11,491		11,064		(1,880	)		9,184
Non-compete		2,602		(1,224	)		1,378		2,117		(954	)		1,163
Patents		5,230		(615	)		4,615		3,402		(210	)		3,192
Trademarks		2,003		(643	)		1,360		3,771		(559	)		3,212
Licenses		2,640		(194	)		2,446		82		(82	)		-
Total	$	113,550	$	(6,468	)	$	107,082	$	103,457	$	(4,638	)	$	98,819

Schedule Of Changes In The Carrying Amount Of Goodwill By Business Segment

	Fiscal year ended March 31, 2012
	Europe			Americas			Asia		Total
Balance at beginning of year	$	177,881		$	143,225		$	22,560	$	343,666
Goodwill acquired during the year		1,250			7,973			1,500		10,723
Adjustments related to the finalization of purchase accounting for prior year acquisitions		374			5			-		379
Foreign currency translation		(7,977	)		(449	)		719		(7,707	)
Balance at end of year	$	171,528		$	150,754		$	24,779	$	347,061

	Fiscal year ended March 31, 2011
	Europe		Americas		Asia		Total
Balance at beginning of year	$	162,641	$	132,915	$	21,709	$	317,265
Goodwill acquired during the year		7,710		7,591		-		15,301
Adjustments related to the finalization of purchase accounting for prior year acquisitions		24		2,250		-		2,274
Foreign currency translation		7,506		469		851		8,826
Balance at end of year	$	177,881	$	143,225	$	22,560	$	343,666

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Other (Income) Expense, Net And Charges Related To Refinancing (Tables)

12 Months Ended

Mar. 31, 2012

Other (Income) Expense, Net And Charges Related To Refinancing [Abstract]

Summary Of Other (Income) Expense, Net

	Fiscal Years Ended March 31,
	2012		2011		2010
Foreign exchange transaction losses	$	1,483	$	732	$	3,045
Secondary offering fees		—		615		150
Other		1,585		830		1,189
Total	$	3,068	$	2,177	$	4,384

Summary Of Charges Related To Refinancing

	Fiscal Years Ended March 31,
	2012		2011		2010
Charges related to refinancing	$	—	$	8,155	$	—

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Debt (China Term Loan) (Narrative) (Details) (China Term Loan [Member]) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012 USD ($) Y	Mar. 31, 2012 CNY	Mar. 31, 2011 USD ($)	Mar. 31, 2011 CNY
Debt Instrument [Line Items]
Maximum borrowing capacity		75,000	$ 11,909	75,000
Debt drawn amount	6,034	38,000
Term loan (in years)	6	6
Interest rate of debt instrument	7.26%	7.26%
Quarterly installments	$ 318	2,000

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Stock-Based Compensation (Summary Of Changes Of Non-Vested Options) (Details) (USD $)	12 Months Ended
	Mar. 31, 2012
Stock-Based Compensation [Abstract]
Nonvested, Number of Options, Beginning Balance	357,903
Number of Options, Vested	(247,866)
Nonvested, Number of Options, Ending Balance	110,037
Weighted Average Grant-Date Fair Value, Nonvested, Beginning Balance	$ 8.70
Weighted Average Grant-Date Fair Value, Vested	$ 9.06
Weighted Average Grant-Date Fair Value, Nonvested, Ending Balance	$ 7.87

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Goodwill And Other Intangible Assets (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Goodwill And Other Intangible Assets [Abstract]
Amortization expense, related to finite-lived intangible assets	$ 1,828	$ 876	$ 706
Expected amortization expense, 2013	2,463
Expected amortization expense, 2014	2,238
Expected amortization expense, 2015	2,124
Expected amortization expense, 2016	2,092
Expected amortization expense, 2017	1,966
Estimated tax-deductible goodwill	$ 12,745	$ 14,982

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Stockholders' Equity (Tables)

12 Months Ended

Mar. 31, 2012

Stockholders' Equity [Abstract]

Change In Number Of Shares Of Common Stock Outstanding

Shares outstanding as of March 31, 2011	50,034,353
Repurchase of common shares	(2,646,885	)
Shares issued as part of equity-based compensation plans, net of equity awards surrendered for option price and taxes	412,661
Shares outstanding as of March 31, 2012	47,800,129

Components Of Accumulated Other Comprehensive Income

	Beginning Balance			Before-Tax Amount			Tax Benefit (Expense)			Net-of-Tax Amount			Ending Balance
March 31, 2012
Pension funded status adjustment	$	(3,512	)	$	(7,311	)	$	1,841		$	(5,470	)	$	(8,982	)
Unrealized gain (loss) on derivative instruments		4,436			(5,170	)		1,909			(3,261	)		1,175
Foreign currency translation adjustment		114,256			(32,356	)		—			(32,356	)		81,900
Accumulated other comprehensive income	$	115,180		$	(44,837	)	$	3,750		$	(41,087	)	$	74,093
March 31, 2011
Pension funded status adjustment	$	(5,479	)	$	2,761		$	(794	)	$	1,967		$	(3,512	)
Unrealized gain (loss) on derivative instruments		(5,034	)		14,721			(5,251	)		9,470			4,436
Foreign currency translation adjustment		77,717			36,539			—			36,539			114,256
Accumulated other comprehensive income	$	67,204		$	54,021		$	(6,045	)	$	47,976		$	115,180
March 31, 2010
Pension funded status adjustment	$	(4,794	)	$	(318	)	$	(367	)	$	(685	)	$	(5,479	)
Unrealized gain (loss) on derivative instruments		(7,660	)		4,047			(1,421	)		2,626			(5,034	)
Foreign currency translation adjustment		46,509			31,208			—			31,208			77,717
Accumulated other comprehensive income	$	34,055		$	34,937		$	(1,788	)	$	33,149		$	67,204

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Acquisitions

12 Months Ended

Mar. 31, 2012

Acquisitions [Abstract]

Acquisitions

2. Acquisitions

In fiscal 2012, the Company completed the following four acquisitions with a combined net purchase price of $24,553, using cash on hand.

The Company obtained a controlling financial interest in Powertech Batteries (which is a part of Allied Electronics Corporation Limited (Altron)), in South Africa to produce and market batteries for industrial applications. This will serve both reserve power and motive power customers across sub-Saharan Africa, including South Africa.

The Company obtained a controlling financial interest in EAS Germany GmBH, to produce large format lithium-ion battery cells with GAIA Akkumulatorenwerke GmbH ("GAIA"), a wholly owned subsidiary of Lithium Technology Corporation ("LTC").

The Company obtained a controlling financial interest in Energy Leader Batteries India Limited in India to serve both reserve and motive power customers in India.

The Company has also acquired Industrial Battery Holding S.A., the parent company of EnerSystem, a market leader in the South American motive power and reserve power battery markets, with headquarters in Buenos Aires, Argentina and with manufacturing plants in Argentina and Brazil as well as operations in Chile.

The Company is in the process of finalizing purchase accounting for these acquisitions. The Company made initial allocations of the purchase prices at the dates of the acquisitions based on the estimated fair value of the acquired assets and liabilities assumed. The Company obtained this information during due diligence and through other sources. The Company will finalize the estimates of fair value and the allocations of purchase prices will be adjusted during fiscal 2013. The Company acquired intangible assets, in connection with each acquisition, including trademarks, customer relationships, technology and goodwill. Trademarks were initially valued at $2,000, non-compete agreements at $500, customer relationships at $3,400 and technology at $4,265. Customer relationships, non-compete agreements and technology were assigned finite useful lives and amortization is recorded over the economic life of the intangibles. Goodwill relating to these acquisitions was recorded at $10,723.

The results of these acquisitions have been included in the Company's results of operations from the dates of their respective acquisitions. Pro forma earnings per share computations have not been presented as these acquisitions are not considered material.

In fiscal 2011, the Company made three acquisitions, the most significant of which was the acquisition of the lithium-ion battery business, ABSL Power Solutions Ltd ("ABSL"), which was completed on February 28, 2011. The purchase price paid for these transactions, net of cash received, was $32,200 and was financed using cash on hand. The Company finalized purchase accounting for these acquisitions. The Company acquired intangible assets, in connection with the ABSL acquisition, including trademarks, customer relationships, technology and goodwill. Trademarks were valued at $1,774, customer relationships at $3,547 and technology at $2,741. Customer relationships and technology were assigned finite useful lives and amortization is recorded over the economic life of the intangibles. Goodwill relating to the acquisition of ABSL was recorded at $15,342.

In fiscal 2010, the Company made three acquisitions, the most significant of which was the acquisition of the industrial battery businesses of the Swiss company Accu Holding AG, which included the acquisition of the stock of OEB Traction Batteries and the operating assets and liabilities of Oerlikon Stationery Batteries and its Swedish sales subsidiary (all collectively referred to as "Oerlikon") during November 2009. The accounting for the Oerlikon acquisition resulted in the recognition of a bargain purchase gain of $2,919. The total purchase price for these transactions, net of cash received, was $33,242 and was financed using cash on hand.

These acquisitions and the investment provide the Company with an additional range of well respected and designed products for use in high integrity applications in telecommunications, utilities, rail, material handling and mining, as well as other sectors.

In connection with certain of its acquisitions, the Company formulated restructuring plans for the integration of the acquired businesses. See Note 20 for additional information regarding these plans.

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Restructuring Plans (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended	36 Months Ended	3 Months Ended	36 Months Ended	12 Months Ended					12 Months Ended
	Mar. 31, 2012 employee	Mar. 31, 2011	Jan. 02, 2011 Oerlikon [Member] employee	Mar. 31, 2012 Oerlikon [Member]	Mar. 31, 2012 European And American Operations [Member]	Mar. 31, 2012 Workforce Reduction [Member] Europe [Member]	Mar. 31, 2011 Workforce Reduction [Member] Europe [Member]	Mar. 31, 2011 Workforce Reduction [Member] European Operations [Member] employee	Mar. 31, 2012 Workforce Reduction [Member] European Operations [Member]	Mar. 31, 2012 Relocation Of Manufacturing [Member] European Operations [Member]
Restructuring Cost and Reserve [Line Items]
Number of manufacturing facilities closed			2
Reduction in number of employees	470		100					60		80
Restructuring reserve									$ 556	$ 630
Costs incurred by the Company against the accrual	2,270					3,263	1,316			2,433
Expected additional restructuring charges					105					1,100
Accrual adjustment					246	435
Severance-related costs								5,200		4,200
Restructuring charges incurred to date		$ 31,894		$ 4,526		$ 1,783	$ 3,830			$ 3,070

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Goodwill And Other Intangible Assets (Schedule Of Company's Other Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
Intangible Assets [Line Items]
Gross Amount, Total	$ 113,550	$ 103,457
Accumulated Amortization, Total	(6,468)	(4,638)
Net Amount, Total	107,082	98,819
Customer Relationships [Member]
Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	14,330	11,064
Finite-lived intangible assets, Accumulated Amortization	(2,839)	(1,880)
Finite-lived intangible assets, Net Amount	11,491	9,184
Non-Compete [Member]
Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	2,602	2,117
Finite-lived intangible assets, Accumulated Amortization	(1,224)	(954)
Finite-lived intangible assets, Net Amount	1,378	1,163
Patents [Member]
Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	5,230	3,402
Finite-lived intangible assets, Accumulated Amortization	(615)	(210)
Finite-lived intangible assets, Net Amount	4,615	3,192
Trademarks [Member]
Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	2,003	3,771
Finite-lived intangible assets, Accumulated Amortization	(643)	(559)
Finite-lived intangible assets, Net Amount	1,360	3,212
Licenses [Member]
Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	2,640	82
Finite-lived intangible assets, Accumulated Amortization	(194)	(82)
Finite-lived intangible assets, Net Amount	2,446
Trademarks [Member]
Intangible Assets [Line Items]
Indefinite-lived intangible assets, Gross Amount	86,745	83,021
Indefinite-lived intangible assets, Accumulated Amortization	(953)	(953)
Indefinite-lived intangible assets, Net Amount	$ 85,792	$ 82,068

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Fair Value Of Financial Instruments (Tables)

12 Months Ended

Mar. 31, 2012

Fair Value Of Financial Instruments [Abstract]

Financial Assets And (Liabilities), Measured At Fair Value On A Recurring Basis

	Total Fair Value Measurement March 31, 2012			Quoted Price in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Interest rate swap agreements	$	(3,872	)	$	—	$	(3,872	)	$	—
Lead forward contracts		(851	)		—		(851	)		—
Foreign currency forward contracts		782			—		782			—
Total derivatives	$	(3,941	)	$	—	$	(3,941	)	$	—

	Total Fair Value Measurement March 31, 2011			Quoted Price in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Interest rate swap agreements	$	(5,847	)	$	—	$	(5,847	)	$	—
Lead forward contracts		9,575			—		9,575			—
Foreign currency forward contracts		(2,591	)		—		(2,591	)		—
Total derivatives	$	1,137		$	—	$	1,137		$	—

Carrying Amounts And Estimated Fair Values Of Company's Financial Instruments

	March 31, 2012						March 31, 2011
	Carrying Amount			Fair Value			Carrying Amount			Fair Value
Financial assets:
Derivatives (1)	$	782		$	782		$	9,575		$	9,575
Financial liabilities:
Convertible Notes	$	148,272	(2)	$	200,100	(3)	$	141,837	(2)	$	215,625	(3)
Derivatives (1)		4,723			4,723			8,438			8,438

⁽¹⁾  Represents interest rate swap agreements, lead and foreign currency hedges (see Note 12 for asset and liability positions of the interest rate swap agreements, lead and foreign currency hedges at March 31, 2012 and March 31, 2011).

⁽²⁾  The carrying amounts of the Convertible Notes at March 31, 2012 and March 31, 2011 represent the $172,500 principal value, less the unamortized debt discount (see Note 8).

⁽³⁾  The fair value amounts of the Convertible Notes represent the trading values of the Convertible Notes with a principal value of $172,500 at March 31, 2012 and March 31, 2011.

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Other (Income) Expense, Net And Charges Related To Refinancing

12 Months Ended

Mar. 31, 2012

Other (Income) Expense, Net And Charges Related To Refinancing [Abstract]

Other (Income) Expense, Net And Charges Related To Refinancing

22. Other (Income) Expense, Net and Charges Related to Refinancing

Other (income) expense, net consists of the following:

	Fiscal Years Ended March 31,
	2012		2011		2010
Foreign exchange transaction losses	$	1,483	$	732	$	3,045
Secondary offering fees		—		615		150
Other		1,585		830		1,189
Total	$	3,068	$	2,177	$	4,384

Charges related to refinancing:

	Fiscal Years Ended March 31,
	2012		2011		2010
Charges related to refinancing	$	—	$	8,155	$	—

In fiscal 2011, the Company incurred charges of $8,155 in connection with the refinancing of the Company's previous credit facility. These charges included $2,308 in write offs of deferred financing fees and $5,847 of losses from discontinuing hedge accounting for the interest rate swap agreements.

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Warranty

12 Months Ended

Mar. 31, 2012

Warranty [Abstract]

Warranty

21. Warranty

The Company provides for estimated product warranty expenses when the related products are sold and are included within accrued expenses and other liabilities. Because warranty estimates are forecasts that are based on the best available information, primarily historical claims experience, claims costs may differ from amounts provided. An analysis of changes in the liability for product warranties is as follows:

Balance at March 31, 2009	$	30,914
Current year provisions		13,123
Costs incurred		(13,283	)
Foreign exchange and other		985
Balance at March 31, 2010	$	31,739
Current year provisions		20,565
Costs incurred		(17,499	)
Foreign exchange and other		1,201
Balance at March 31, 2011	$	36,006
Current year provisions		26,841
Costs incurred		(20,185	)
Foreign exchange and other		(595	)
Balance at March 31, 2012	$	42,067

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Retirement Plans (Significant Assumptions Used To Determine The Projected Benefit Obligations) (Details)	Mar. 31, 2012	Mar. 31, 2011
United States Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.80%	5.70%
Expected return on plan assets	8.00%	8.00%
Rate of compensation increase
Minimum [Member] | International Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.50%	4.00%
Expected return on plan assets	5.50%	5.50%
Rate of compensation increase	2.00%	2.00%
Maximum [Member] | International Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.50%	5.50%
Expected return on plan assets	7.00%	7.00%
Rate of compensation increase	4.00%	4.00%

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Acquisitions (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended				12 Months Ended		0 Months Ended				1 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010	Mar. 31, 2012 Trademarks [Member]	Mar. 31, 2012 Customer Relationships [Member]	Mar. 31, 2012 Technology [Member]	Feb. 28, 2011 ABSL Power Solutions Ltd [Member]	Feb. 28, 2011 ABSL Power Solutions Ltd [Member] Trademarks [Member]	Feb. 28, 2011 ABSL Power Solutions Ltd [Member] Customer Relationships [Member]	Feb. 28, 2011 ABSL Power Solutions Ltd [Member] Technology [Member]	Nov. 30, 2009 Oerlikon [Member]
Business Acquisition [Line Items]
Number of acquisitions	4
Combined net purchase price	$ 24,553						$ 32,200				$ 33,242
Non-compete agreements					500
Acquired intangible assets				2,000	3,400	4,265		1,774	3,547	2,741
Goodwill relating to acquisitions	10,723	15,301					15,342
Bargain purchase gain			$ 2,919								$ 2,919

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Derivative Financial Instruments (Tables)

12 Months Ended

Mar. 31, 2012

Mar. 31, 2011

Mar. 31, 2010

Derivative Financial Instruments [Abstract]

Fair Value Of Derivative Instruments In The Consolidated Balance Sheets

	Derivatives and Hedging Activities Designated as Cash Flow Hedges				Derivatives and Hedging Activities Not Designated as Hedging  Instruments
	March 31, 2012		March 31, 2011		March 31, 2012		March 31, 2011
Prepaid and other current assets
Lead hedge forward contracts	$	—	$	9,575	$	—	$	—
Foreign currency forward contracts		670		—		112		—
Other assets		30		—		—		—
Total assets	$	700	$	9,575	$	112	$	—
Accrued expenses
Interest rate swap agreements	$	—	$	—	$	3,628	$	—
Lead hedge forward contracts		881		—		—		—
Foreign currency forward contracts		—		2,591		—		—
Other liabilities
Interest rate swap agreements		—		—		244		5,847
Total liabilities	$	881	$	2,591	$	3,872	$	5,847

The Effect Of Derivative Instruments On The Consolidated Statements Of Income

Derivatives Designated as Cash Flow Hedges	Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)			Location of Gain (Loss)  Reclassified from AOCI into Income (Effective Portion)	Gain (Loss) Reclassified from AOCI into Income (Effective Portion)
Lead hedge forward contracts	$	(9,731	)	Cost of goods sold	$	(831	)
Foreign currency forward contracts		(152	)	Cost of goods sold		(3,882	)
Total	$	(9,883	)		$	(4,713	)

Derivatives in a Cash Flow Hedging Relationship	Gain (Loss) Recognized  in AOCI on Derivative (Effective Portion)			Location of Gain (Loss)  Reclassified from AOCI into Income (Effective Portion)	Gain (Loss) Reclassified from AOCI into Income (Effective Portion)
Interest rate swap contracts	$	(2,835	)	Interest expense	$	(6,698	)
Lead hedge forward contracts		15,930		Cost of goods sold		6,417
Foreign currency forward contracts		(4,031	)	Cost of goods sold		471
Total	$	9,064			$	190

Derivatives in a Cash Flow Hedging Relationship	Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)			Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	Gain (Loss) Reclassified from AOCI into Income (Effective Portion)
Interest rate swap contracts	$	(3,141	)	Interest expense	$	(7,059	)
Lead hedge forward contracts		9,844		Cost of goods sold		11,973
Foreign currency forward contracts		2,679		Cost of goods sold		428
Total	$	9,382				$5,342

Effect Of Derivative Instruments

Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss) Recognized in Income on Derivative	Gain (Loss)
Interest rate swap contracts	Other (income) expense, net	$	(977	)
Foreign currency forward contracts	Other (income) expense, net		(106	)
Total		$	(1,083	)

Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss) Recognized in Income on Derivative	Gain (Loss)
Interest rate swap contracts	Charges related to refinancing	$	(5,847	)
Total		$	(5,847	)

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Operations By Industry Segment And Geographic Area

12 Months Ended

Mar. 31, 2012

Operations By Industry Segment And Geographic Area [Abstract]

Operations By Industry Segment And Geographic Area

23. Operations by Industry Segment and Geographic Area

The Company has three reportable business segments based on geographic regions, defined as follows:

• Americas, which includes North and South America, with segment headquarters in Reading, Pennsylvania, USA,

• Europe, which includes Europe, the Middle East and Africa, with segment headquarters in Zurich, Switzerland, and

• Asia, which includes Asia, Australia and Oceania, with segment headquarters in Singapore.

Summarized financial information related to the Company's business segments at March 31, 2012, 2011 and 2010 and for each of the fiscal years then ended is shown below.

	Fiscal Years Ended March 31,
	2012			2011			2010
Net sales by segment to unaffiliated customers
Europe	$	995,431		$	890,313		$	741,975
Americas		1,082,747			896,629			700,297
Asia		205,191			177,520			137,113
Total net sales	$	2,283,369		$	1,964,462		$	1,579,385
Net sales by product line
Reserve power	$	1,092,734		$	970,480		$	820,526
Motive power		1,190,635			993,982			758,859
Total net sales	$	2,283,369		$	1,964,462		$	1,579,385
Intersegment sales
Europe	$	75,652		$	55,586		$	37,449
Americas		38,115			42,141			24,848
Asia		21,182			21,349			13,237
Total intersegment sales(1)	$	134,949		$	119,076		$	75,534
Operating earnings
Europe	$	63,872		$	55,643		$	17,649
Americas		138,894			124,515			87,156
Asia		12,133			10,469			20,502
Legal proceedings settlement income (Europe)		900			—			—
Restructuring charges (Europe)		(4,988	)		(6,813	)		(13,212	)
Restructuring charges (Americas)		—			—			(717	)
Bargain purchase gain (Europe)		—			—			2,919
Total operating earnings(2)	$	210,811		$	183,814		$	114,297
Property, plant and equipment, net
Europe	$	161,854		$	169,056		$	156,953
Americas		144,701			142,263			138,217
Asia		46,660			33,066			19,971
Total	$	353,215		$	344,385		$	315,141
Capital Expenditures
Europe	$	21,631		$	22,034		$	20,624
Americas		20,862			22,368			21,089
Asia		6,450			15,538			3,398
Total	$	48,943		$	59,940		$	45,111
Depreciation and Amortization
Europe	$	25,451		$	21,564		$	22,348
Americas		21,466			19,842			19,189
Asia		3,443			2,987			3,314
Total	$	50,360		$	44,393		$	44,851

(1) Intersegment sales are presented on a cost plus basis which takes into consideration the effect of transfer prices between legal entities.

(2) The Company does not allocate interest expense or other (income) expense to the reportable segments.

The Company markets its products and services in over 100 countries. Sales are attributed to countries based on the location of sale approval and acceptance. Sales to customers in the United States were 42.6%, 41.3% and 40.4% for fiscal years ended March 31, 2012, 2011 and 2010, respectively. No single country, outside the United States, exceeded 10% of consolidated net sales, and therefore deemed not material for separate disclosure.

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Quarterly Financial Data

12 Months Ended

Mar. 31, 2012

Quarterly Financial Data [Abstract]

Quarterly Financial Data

24. Quarterly Financial Data (Unaudited)

The Company reports interim financial information for 13-week periods, except for the first quarter, which always begins on April 1, and the fourth quarter, which always ends on March 31. The four quarters in fiscal 2012 ended on July 3, 2011, October 2, 2011, January 1, 2012, and March 31, 2012, respectively. The four quarters in fiscal 2011 ended on July 4, 2010, October 3, 2010, January 2, 2011, and March 31, 2011, respectively.

	1st Quarter		2nd Quarter		3rd Quarter		4th Quarter		Fiscal Year
Fiscal year ended March 31, 2012
Net sales	$	569,229	$	547,140	$	574,246	$	592,754	$	2,283,369
Gross profit		121,971		114,395		130,876		145,463		512,705
Operating earnings(1)		48,715		42,440		53,777		65,879		210,811
Net earnings		33,496		28,289		36,859		45,323		143,967
Net earnings attributable to EnerSys stockholders		33,496		28,289		36,859		45,359		144,003
Net earnings per common share attributable to EnerSys stockholders—basic	$	0.67	$	0.57	$	0.77	$	0.95	$	2.95
Net earnings per common share attributable to EnerSys stockholders—diluted	$	0.66	$	0.57	$	0.77	$	0.94	$	2.93

Fiscal year ended March 31, 2011
Net sales	$	434,969	$	472,843	$	508,596	$	548,054	$	1,964,462
Gross profit		96,614		110,721		117,900		124,609		449,844
Operating earnings(2)		37,480		44,496		48,320		53,518		183,814
Net earnings(3)		23,027		26,549		33,759		30,091		113,426
Net earnings attributable to EnerSys stockholders		23,027		26,549		33,759		30,091		113,426
Net earnings per common share attributable to EnerSys stockholders—basic	$	0.47	$	0.54	$	0.68	$	0.60	$	2.30
Net earnings per common share attributable to EnerSys stockholders—diluted	$	0.47	$	0.53	$	0.67	$	0.59	$	2.27

(1) Included in Operating earnings were restructuring charges of $410, $902, $1,440 and $2,236 for the first, second, third and fourth quarters of fiscal 2012, respectively. Operating earnings also included a legal proceedings settlement income of $900, in the second quarter of fiscal 2012.

(2) Included in Operating earnings were restructuring charges of $723, $2,750, $1,754 and $1,586 for the first, second, third and fourth quarters of fiscal 2011, respectively.

(3) Included in Net earnings of fiscal 2011 were charges related to refinancing of $8,155 in the fourth quarter of fiscal 2011.

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Summary Of Significant Accounting Policies

12 Months Ended

Mar. 31, 2012

Summary Of Significant Accounting Policies [Abstract]

Summary Of Significant Accounting Policies

1. Summary of Significant Accounting Policies

Description of Business

EnerSys and its predecessor companies have been manufacturers of industrial batteries for over 100 years. EnerSys is a global leader in stored energy solutions for industrial applications. The Company manufactures, markets and distributes industrial batteries and related products such as chargers, power equipment and battery accessories, and provides related after-market and customer-support services for industrial batteries.

Principles of Consolidation

The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries and any partially-owned subsidiaries that the Company has the ability to control. Control generally equates to ownership percentage, whereby investments that are more than 50% owned are generally consolidated, investments in affiliates of 50% or less but greater than 20% are generally accounted for using the equity method, and investments in affiliates of 20% or less are accounted for using the cost method. All intercompany transactions and balances have been eliminated in consolidation.

Foreign Currency Translation

Results of foreign operations are translated into U.S. dollars using average exchange rates during the period. The assets and liabilities are translated into U.S. dollars using exchange rates as of the balance sheet date. Gains or losses resulting from translating the foreign currency financial statements are accumulated as a separate component of accumulated other comprehensive income ("AOCI") in EnerSys' stockholders' equity and noncontrolling interests.

Transaction gains and losses resulting from exchange rate changes on transactions denominated in currencies other than the functional currency of the applicable subsidiary are included in the Consolidated Statements of Income, within "Other (income) expense, net", in the year in which the change occurs.

Revenue Recognition

The Company recognizes revenue when the earnings process is complete. This occurs when risk and title transfers, collectibility is reasonably assured and pricing is fixed and determinable. Shipment terms are either shipping point or destination and do not differ significantly between the Company's business segments. Accordingly, revenue is recognized when risk and title are transferred to the customer. Amounts invoiced to customers for shipping and handling are classified as revenue. Taxes on revenue producing transactions are not included in net sales.

The Company recognizes revenue from the service of its reserve power and motive power products when the respective services are performed.

Accruals are made at the time of sale for sales returns and other allowances based on the Company's historical experience.

Freight Expense

Amounts billed to customers for outbound freight costs are classified as sales in the consolidated statements of income. Costs incurred by the Company for outbound freight costs to customers, inbound and transfer freight are classified in cost of goods sold.

Warranties

The Company's products are warranted for a period ranging from one to twenty years for reserve power batteries and for a period ranging from one to seven years for motive power batteries. The Company provides for estimated product warranty expenses when the related products are sold. The assessment of the adequacy of the reserve includes a review of open claims and historical experience.

Cash and Cash Equivalents

Cash and cash equivalents include all highly liquid investments with an original maturity of three months or less when purchased.

Concentration of Credit Risk

Financial instruments that subject the Company to potential concentration of credit risk consist principally of short-term cash investments and trade accounts receivable. The Company invests its cash with various financial institutions and in various investment instruments limiting the amount of credit exposure to any one financial institution or entity. The Company has bank deposits that exceed federally-insured limits. In addition, certain cash investments may be made in U.S. and foreign government bonds, or other highly rated investments guaranteed by the U.S. or foreign governments. Concentration of credit risk with respect to trade receivables is limited by a large, diversified customer base and its geographic dispersion. The Company performs ongoing credit evaluations of its customers' financial condition and requires collateral, such as letters of credit, in certain circumstances.

Accounts Receivable

The Company maintains allowances for doubtful accounts for estimated losses resulting from the inability of customers to make required payments. The allowance is based on management's estimate of uncollectible accounts, analysis of historical data and trends, as well as reviews of all relevant factors concerning the financial capability of its customers. Accounts receivable are considered to be past due based on how payments are received compared to the customer's credit terms. Accounts are written off when management determines the account is uncollectible.

Inventories

Inventories are stated at the lower of cost or market. Cost is determined using the first-in, first-out (FIFO) method. The cost of inventory consists of material, labor, and associated overhead.

Property, Plant, and Equipment

Property, plant, and equipment are recorded at cost and include expenditures that substantially increase the useful lives of the assets. Depreciation is provided using the straight-line method over the estimated useful lives of the assets as follows: 10 to 33 years for buildings and improvements and 3 to 15 years for machinery and equipment.

Maintenance and repairs are expensed as incurred. Interest on capital projects is capitalized during the construction period.

Goodwill and Other Intangible Assets

         The Company records the excess of purchase price over the fair value of the tangible and identifiable intangible assets acquired as goodwill. Goodwill and indefinite-lived trade names are tested for impairment at least annually and whenever events or circumstances occur indicating that a possible impairment may have been incurred. The Company utilizes financial projections of its business segments, certain cash flow measures, as well as its market capitalization in its determination of the fair value of these assets.

Finite-lived assets such as purchased and licensed technology, patents and customer lists are amortized over their estimated useful lives, generally over periods ranging from 3 to 20 years. The Company reviews the carrying values of these assets for possible impairment whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable based on undiscounted estimated cash flows expected to result from its use and eventual disposition. The Company continually evaluates the reasonableness of the useful lives of these assets.

Impairment of Long-Lived Assets

The Company reviews the carrying values of its property and equipment for possible impairment whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable based on undiscounted estimated cash flows expected to result from its use and eventual disposition. The factors considered by the Company in performing this assessment include current operating results, trends and other economic factors. In assessing the recoverability of the carrying value of the property and equipment, the Company must make assumptions regarding future cash flows and other factors. If these estimates or the related assumptions change in the future, the Company may be required to record an impairment loss for these assets.

Environmental Expenditures

The Company records a loss and establishes a reserve for environmental remediation liabilities when it is probable that an asset has been impaired or a liability exists and the amount of the liability can be reasonably estimated. Reasonable estimates involve judgments made by management after considering a broad range of information including: notifications, demands or settlements that have been received from a regulatory authority or private party, estimates performed by independent engineering companies and outside counsel, available facts existing and proposed technology, the identification of other potentially responsible parties, their ability to contribute and prior experience. These judgments are reviewed quarterly as more information is received and the amounts reserved are updated as necessary. However, the reserves may materially differ from ultimate actual liabilities if the loss contingency is difficult to estimate or if management's judgments turn out to be inaccurate. If management believes no best estimate exists, the minimum probable loss is accrued.

 Derivative Financial Instruments

           The Company utilizes derivative instruments to mitigate volatility related to interest rates, lead prices and foreign currency exposures. The Company does not hold or issue derivative financial instruments for trading or speculative purposes. The Company recognizes derivatives as either assets or liabilities in the accompanying balance sheet and measures those instruments at fair value. Changes in the fair value of those instruments are reported in AOCI if they qualify for hedge accounting or in earnings if they do not qualify for hedge accounting. Derivatives qualify for hedge accounting if they are designated as hedge instruments and if the hedge is highly effective in achieving offsetting changes in the fair value or cash flows of the asset or liability hedged. Effectiveness is measured on a regular basis using statistical analysis and by comparing the overall changes in the expected cash flows on the lead and foreign currency forward contracts with the changes in the expected all-in cash outflow required for the lead and foreign currency purchases. This analysis is performed on the initial purchases quarterly that cover the quantities hedged. Accordingly, gains and losses from changes in derivative fair value of effective hedges are deferred and reported in AOCI until the underlying transaction affects earnings.

The Company has commodity, foreign exchange and interest rate hedging authorization from the Board of Directors and has established a hedging and risk management program that includes the management of market and counterparty risk. Key risk control activities designed to ensure compliance with the risk management program include, but are not limited to, credit review and approval, validation of transactions and market prices, verification of risk and transaction limits, portfolio stress tests, sensitivity analyses and frequent portfolio reporting, including open positions, determinations of fair value and other risk management metrics.

Market risk is the potential loss the Company and its subsidiaries may incur as a result of price changes associated with a particular financial or commodity instrument. The Company utilizes forward contracts, and swaps as part of its risk management strategies, to minimize unanticipated fluctuations in earnings caused by changes in commodity prices, interest rates and/or foreign currency exchange rates. All derivatives are recognized on the balance sheet at their fair value, unless they qualify for Normal Purchase Normal Sale.

Credit risk is the potential loss the Company may incur due to counterparty's non-performance. The Company is exposed to credit risk from interest rate, foreign currency and commodity derivatives with financial institutions. The Company has credit policies to manage their credit risk, including the use of an established credit approval process, monitoring of counterparty positions and the use of master netting agreements.

The Company has elected to offset net derivative positions under master netting arrangements. The Company does not have any positions involving cash collateral (payables or receivables) under a master netting arrangement as of March 31, 2012 and 2011.

The Company does not have any credit-related contingent features associated with their derivative instruments.

Fair Value of Financial Instruments

The fair value of the Company's cash and cash equivalents, accounts receivable and accounts payable approximate carrying value due to their short maturities.

The fair value of the Company's $350,000 senior secured revolving credit facility ("2011 Credit Facility"), the 75,000 Chinese Renminbi ("RMB") credit facility ("China Term Loan"), the 273,780 Indian Rupee ("INR") term loan ("India Term Loan") and short-term debt approximate their carrying value, as they are variable rate debt and the current terms are comparable to market terms as of the balance sheet dates and are classified as Level 2.

The fair value amounts of the Company's $172,500 senior unsecured 3.375% convertible notes ("Convertible Notes") represent the trading values of the Convertible Notes which is based upon quoted market prices and are classified as Level 2.

Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (an exit price). The Company and its subsidiaries use, as appropriate, a market approach (generally, data from market transactions), an income approach (generally, present value techniques and option-pricing models), and/or a cost approach (generally, replacement cost) to measure the fair value of an asset or liability. These valuation approaches incorporate inputs such as observable, independent market data and/or unobservable data that management believes are predicated on the assumptions market participants would use to price an asset or liability. These inputs may incorporate, as applicable, certain risks such as nonperformance risk, which includes credit risk.

Lead contracts, foreign currency contracts and interest rate contracts generally use an income approach to measure the fair value of these contracts, utilizing readily observable inputs, such as forward interest rates (e.g., London Interbank Offered Rate—"LIBOR") and forward foreign currency exchange rates (e.g., GBP and euro) and commodity prices (e.g. London Metals Exchange), as well as inputs that may not be observable, such as credit valuation adjustments. When observable inputs are used to measure all or most of the value of a contract, the contract is classified as Level 2. Over-the-counter (OTC) contracts are valued using quotes obtained from an exchange, binding and non-binding broker quotes. Furthermore, the Company obtains independent quotes from the market to validate the forward price curves. OTC contracts include forwards, swaps and options. To the extent possible, fair value measurements utilize various inputs that include quoted prices for similar contracts or market-corroborated inputs.

When unobservable inputs are significant to the fair value measurement, a contract is classified as Level 3. The Company did not have any Level 3 positions at March 31, 2012 or March 31, 2011. Additionally, Level 2 fair value measurements include adjustments for credit risk based on the Company's own creditworthiness (for net liabilities) and its counterparties' creditworthiness (for net assets). The Company assumes that observable market prices include sufficient adjustments for liquidity and modeling risks. The Company did not have any contracts that transferred between Level 2 and Level 3 as well as Level 1 and Level 2.

Income Taxes

The Company accounts for income taxes in accordance with the Financial Accounting Standards Board ("FASB") guidance, which requires deferred tax assets and liabilities be recognized using enacted tax rates to measure the effect of temporary differences between book and tax bases on recorded assets and liabilities. FASB guidance also requires that deferred tax assets be reduced by a valuation allowance, if it is more likely than not some portion or all of the deferred tax assets will not be recognized.

The Company evaluates on a quarterly basis its ability to realize deferred tax assets by assessing its valuation allowance and by adjusting the amount of such allowance, if necessary. The factors used to assess the likelihood of realization are forecasts of future taxable income and available tax planning strategies that could be implemented to realize the net deferred tax assets.

In accordance with FASB guidance on accounting for uncertainty in income taxes, the Company evaluates tax positions to determine whether the benefits of tax positions are more likely than not of being sustained upon audit based on the technical merits of the tax position. For tax positions that are more likely than not of being sustained upon audit, the Company recognizes the largest amount of the benefit that is greater than 50% likely of being realized upon ultimate settlement. For tax positions that are not more likely than not of being sustained upon audit, the Company does not recognize any portion of the benefit. If the more likely than not threshold is not met in the period for which a tax position is taken, the Company may subsequently recognize the benefit of that tax position if the tax matter is effectively settled, the statute of limitations expires, or if the more likely than not threshold is met in a subsequent period.

Deferred Financing Fees

Debt issuance costs that are incurred by the Company in connection with the issuance of debt are deferred and amortized to interest expense over the life of the underlying indebtedness, adjusted to reflect any early repayments.

 Retirement Plans

The Company accounts for retirement plans in accordance with FASB guidance on employers' accounting for defined benefit pension benefit plans, which requires an entity to recognize in its statement of financial position an asset for a defined benefit postretirement plan's overfunded status or a liability for a plan's underfunded status, and to measure a defined benefit postretirement plan's assets and obligation that determine its funded status as of the end of the balance sheet date.

The Company uses certain assumptions in the calculation of the actuarial valuations of its defined benefit plans. These assumptions include discount rate, rates of increase in compensation levels and expected long-term rates of return of plan assets. If actual results are less favorable than those projected by the Company, additional expense may be required.

Stock-Based Compensation Plans

The Company accounts for stock compensation in accordance with FASB guidance, which requires the Company to measure the cost of employee services received in exchange for the award of an equity instrument based on the grant-date fair value of the award, with such cost recognized over the applicable vesting period. In addition, the guidance requires an entity to provide certain disclosures in order to assist in understanding the nature of share-based payment transactions and the effects of those transactions on the financial statements.

Market Share Units

The fair value of the market share units is estimated at the date of grant using a binomial lattice model with the following assumptions: a risk-free interest rate, dividend yield, time to maturity and expected volatility. These units vest and are settled in common stock on the third anniversary of the date of grant. Market share units are converted into between zero and two shares of common stock for each unit granted at the end of a three-year performance cycle. The conversion ratio is calculated by dividing the average closing share price of the Company's common stock during the ninety calendar days immediately preceding the vesting date by the average closing share price of the Company's common stock during the ninety calendar days immediately preceding the grant date, with the resulting quotient capped at two. This quotient is then multiplied by the number of market share units granted to yield the number of shares of common stock to be delivered on the vesting date. The Company recognizes compensation expense using the straight-line method over the life of the market share units.

Restricted Stock Units

The fair value of restricted stock units is based on the closing market price of the Company's common stock on the date of grant. These awards generally vest, and are settled in common stock, at 25% per year, over a four-year period from the date of grant. The Company recognizes compensation expense using the straight-line method over the life of the restricted stock units.

Stock Options

The fair value of the options granted is estimated at the date of grant using the Black-Scholes option-pricing model utilizing assumptions based on historical data and current market data. The assumptions include expected term of the options, risk-free interest rate, expected volatility, and dividend yield. The expected term represents the expected amount of time that options granted are expected to be outstanding, based on historical and forecasted exercise behavior. The risk-free rate is based on the rate at grant date of zero-coupon U.S. Treasury Notes with a term equal to the expected term of the option. Expected volatility is estimated using historical volatility rates based on historical weekly price changes. The Company's dividend yield is based on historical data. The Company recognizes compensation expense using the straight-line method over the vesting period of the options.

Earnings Per Share

Basic earnings per common share ("EPS") are computed by dividing net earnings available to common stockholders by the weighted average number of common shares outstanding for the period. Diluted EPS reflects the potential dilution that would occur if securities or other contracts to issue common stock were exercised or converted into common stock. At March 31, 2012, 2011 and 2010, the Company had outstanding stock options, restricted stock units, market share units and Convertible Notes, which could potentially dilute basic earnings per share in the future.

Segment Reporting

FASB guidance defines that a segment for reporting purposes is based on the financial performance measures that are regularly reviewed by the chief operating decision maker to assess segment performance and to make decisions about a public entity's allocation of resources. Based on this guidance, the Company reports its segment results based upon the three geographical regions of operations—Americas, Europe and Asia.

 New Accounting Pronouncements

In June 2011, the FASB issued authoritative guidance requiring entities to present net income and other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements and eliminated the option to present components of other comprehensive income as part of the statement of shareholders' equity. This guidance will be effective for the Company in the first quarter of fiscal 2013 and is not expected to have an impact on its financial statements other than the change in presentation.

In September 2011, the FASB issued revised guidance to simplify how entities test goodwill for impairment. The amendments will permit an entity to first assess qualitative factors to determine whether it is necessary to perform the two-step goodwill impairment test. An entity will no longer be required to calculate the fair value of a reporting unit unless the entity determines, based on a qualitative assessment that it is more likely than not that its fair value is less than its carrying amount. The amendments are effective for annual and interim goodwill impairment tests performed for fiscal years beginning after December 15, 2011, with early adoption permitted. The Company plans to adopt this guidance for its annual goodwill impairment test performed in fiscal 2013 and thereafter. The adoption will not have an impact on the Company's financial statements.

Effective January 2, 2012, the Company prospectively adopted accounting guidance that was issued to clarify existing fair value measurement guidance as well as enhance fair value disclosures. The additional disclosures required by this guidance include quantitative information about significant unobservable inputs used for Level 3 measurements, qualitative information about the sensitivity of recurring Level 3 measurements, information about any transfers between Level 1 and 2 of the fair value hierarchy, information about when the current use of a non-financial asset is different from the highest and best use, and the hierarchy classification for assets and liabilities whose fair value is disclosed only in the notes to the financial statements. The adoption of this standard did not have a material impact on the Company's financial statements.

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.

Reclassifications

Certain amounts in the prior years' financial statements have been reclassified to conform to the current-year presentation.

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Subsequent Events

12 Months Ended

Mar. 31, 2012

Subsequent Events [Abstract]

Subsequent Events

25. Subsequent Events

On May 14, 2012, under the Company's 2010 Equity Incentive Plan, the Company granted 223,224 restricted stock units, which vest 25% each year over four-years from the date of grant, and 292,123 market share units, which vest three years from the date of grant.

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Derivative Financial Instruments (Effect Of Derivative Instruments) (Details) (Not Designated As Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Derivatives, Fair Value [Line Items]
Location of Gain (Loss) Recognized in Income on Derivative	$ (1,083)	$ (5,847)
Charges Related To Refinancing [Member] | Interest Rate Swap Contracts [Member]
Derivatives, Fair Value [Line Items]
Location of Gain (Loss) Recognized in Income on Derivative		(5,847)
Other (Income) Expense [Member] | Interest Rate Swap Contracts [Member]
Derivatives, Fair Value [Line Items]
Location of Gain (Loss) Recognized in Income on Derivative	(977)
Other (Income) Expense [Member] | Foreign Currency Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Location of Gain (Loss) Recognized in Income on Derivative	$ (106)

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Earnings Per Share (Reconciliation From Basic To Diluted Average Common Shares And Net Earnings Per Common Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2012	Jan. 01, 2012	Oct. 02, 2011	Jul. 03, 2011	Mar. 31, 2011	Jan. 02, 2011	Oct. 03, 2010	Jul. 04, 2010	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Earnings Per Share [Abstract]
Net earnings attributable to EnerSys stockholders	$ 45,359	$ 36,859	$ 28,289	$ 33,496	$ 30,091	$ 33,759	$ 26,549	$ 23,027	$ 144,003	$ 113,426	$ 62,304
Basic (weighted-average outstanding shares)									48,748,205	49,376,132	48,122,207
Dilutive potential common shares from exercise and lapse of equity awards, net of shares assumed reacquired									467,830	668,114	711,888
Diluted (weighted-average outstanding shares)									49,216,035	50,044,246	48,834,095
Basic earnings per common share attributable to EnerSys stockholders	$ 0.95	$ 0.77	$ 0.57	$ 0.67	$ 0.60	$ 0.68	$ 0.54	$ 0.47	$ 2.95	$ 2.30	$ 1.29
Diluted earnings per common share attributable to EnerSys stockholders	$ 0.94	$ 0.77	$ 0.57	$ 0.66	$ 0.59	$ 0.67	$ 0.53	$ 0.47	$ 2.93	$ 2.27	$ 1.28
Anti-dilutive equity awards not included in weighted average common shares-diluted									221,097		383,696

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Debt (Tables)

12 Months Ended

Mar. 31, 2012

Debt [Abstract]

Schedule Of Long-Term Debt

	March 31,
	2012		2011
3.375% Convertible Notes, net of discount, due 2038	$	148,272	$	141,837
2011 Credit Facility due 2016		79,400		100,000
China Term Loan due 2017		6,034		6,112
India Term Loan due 2017		5,383		-
Other		40		43
		239,129		247,992
Less current portion		2,540		43
Total long-term debt	$	236,589	$	247,949

Components Of Net Carrying Amount Of Convertible Notes

	March 31,			March 31,
	2012			2011
Principal	$	172,500		$	172,500
Unamortized discount		(24,228	)		(30,663	)
Net carrying amount	$	148,272		$	141,837
Carrying amount of equity component	$	29,850		$	29,850

Summary Of Aggregate Maturities Of Long-Term Debt

2013	$	2,540
2014		2,450
2015		2,450
2016		254,350
2017		1,567
Thereafter
	$	263,357

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Operations By Industry Segment And Geographic Area (Tables)

12 Months Ended

Mar. 31, 2012

Operations By Industry Segment And Geographic Area [Abstract]

Summary Of Financial Information Related To The Company's Business Segments

	Fiscal Years Ended March 31,
	2012			2011			2010
Net sales by segment to unaffiliated customers
Europe	$	995,431		$	890,313		$	741,975
Americas		1,082,747			896,629			700,297
Asia		205,191			177,520			137,113
Total net sales	$	2,283,369		$	1,964,462		$	1,579,385
Net sales by product line
Reserve power	$	1,092,734		$	970,480		$	820,526
Motive power		1,190,635			993,982			758,859
Total net sales	$	2,283,369		$	1,964,462		$	1,579,385
Intersegment sales
Europe	$	75,652		$	55,586		$	37,449
Americas		38,115			42,141			24,848
Asia		21,182			21,349			13,237
Total intersegment sales(1)	$	134,949		$	119,076		$	75,534
Operating earnings
Europe	$	63,872		$	55,643		$	17,649
Americas		138,894			124,515			87,156
Asia		12,133			10,469			20,502
Legal proceedings settlement income (Europe)		900			—			—
Restructuring charges (Europe)		(4,988	)		(6,813	)		(13,212	)
Restructuring charges (Americas)		—			—			(717	)
Bargain purchase gain (Europe)		—			—			2,919
Total operating earnings(2)	$	210,811		$	183,814		$	114,297
Property, plant and equipment, net
Europe	$	161,854		$	169,056		$	156,953
Americas		144,701			142,263			138,217
Asia		46,660			33,066			19,971
Total	$	353,215		$	344,385		$	315,141
Capital Expenditures
Europe	$	21,631		$	22,034		$	20,624
Americas		20,862			22,368			21,089
Asia		6,450			15,538			3,398
Total	$	48,943		$	59,940		$	45,111
Depreciation and Amortization
Europe	$	25,451		$	21,564		$	22,348
Americas		21,466			19,842			19,189
Asia		3,443			2,987			3,314
Total	$	50,360		$	44,393		$	44,851

(1) Intersegment sales are presented on a cost plus basis which takes into consideration the effect of transfer prices between legal entities.

(2) The Company does not allocate interest expense or other (income) expense to the reportable segments.

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Debt (Components Of Net Carrying Amount Of Convertible Notes) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
Debt Instrument [Line Items]
Net carrying amount	$ 239,129	$ 247,992
Convertible Notes [Member]
Debt Instrument [Line Items]
Principal	172,500	172,500
Unamortized discount	(24,228)	(30,663)
Net carrying amount	148,272	141,837
Carrying amount of equity component	$ 29,850	$ 29,850

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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
Current assets:
Cash and cash equivalents	$ 160,490	$ 108,869
Accounts receivable, net of allowance for doubtful accounts (2012 - $10,022; 2011 - $10,547)	466,769	464,072
Inventories, net	361,774	335,003
Deferred taxes	30,247	19,801
Prepaid and other current assets	52,393	70,203
Total current assets	1,071,673	997,948
Property, plant, and equipment, net	353,215	344,385
Goodwill	347,061	343,666
Other intangible assets, net	107,082	98,819
Deferred taxes	15,999	15,785
Other assets	24,249	27,784
Total assets	1,919,279	1,828,387
Current liabilities:
Short-term debt	16,042	3,160
Current portion of long-term debt	2,540	43
Current portion of capital lease obligations	409	819
Accounts payable	249,996	251,814
Accrued expenses	188,403	184,700
Deferred taxes	2,911	3,248
Total current liabilities	460,301	443,784
Long-term debt	236,589	247,949
Capital lease obligations	521	1,429
Deferred taxes	84,479	79,589
Other liabilities	92,468	76,643
Total liabilities	874,358	849,394
Commitments and contingencies
Equity:
Series A Convertible Preferred Stock, $0.01 par value, 1,000,000 shares authorized, no shares issued or outstanding at March 31, 2012 and at March 31, 2011
Common Stock, $0.01 par value, 135,000,000 shares authorized, 52,247,014 shares issued and 47,800,129 shares outstanding at March 31, 2012; 51,834,353 shares issued and 50,034,353 shares outstanding at March 31, 2011	522	518
Additional paid-in capital	474,924	461,597
Treasury stock at cost, 4,446,885 shares held as of March 31, 2012 and 1,800,000 shares held as of March 31, 2011	(78,183)	(19,800)
Retained earnings	560,839	416,836
Accumulated other comprehensive income	74,093	115,180
Total EnerSys stockholders' equity	1,032,195	974,331
Noncontrolling interests	12,726	4,662
Total equity	1,044,921	978,993
Total liabilities and equity	$ 1,919,279	$ 1,828,387

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Income Taxes (Tables)

12 Months Ended

Mar. 31, 2012

Income Taxes [Abstract]

Income Tax Expense

	Fiscal year ended March 31,
	2012			2011			2010
Current:
Federal	$	30,459		$	24,232		$	9,000
State		3,778			2,736			(981	)
Foreign		16,282			14,114			9,957
Total current		50,519			41,082			17,976
Deferred:
Federal		(1,609	)		(1,358	)		4,678
State		(962	)		2,010			852
Foreign		(656	)		(3,716	)		1,445
Total deferred		(3,227	)		(3,064	)		6,975
Income tax expense	$	47,292		$	38,018		$	24,951

Earnings Before Income Taxes

	Fiscal year ended March 31,
	2012		2011		2010
United States	$	87,597	$	57,710	$	37,418
Foreign		103,662		93,734		49,837
Earnings before income taxes	$	191,259	$	151,444	$	87,255

Deferred Tax Assets And Liabilities

	March 31,
	2012			2011
Deferred tax assets:
Accounts receivable	$	1,111		$	1,304
Inventories		6,707			6,669
Net operating loss carryforwards		71,773			78,236
Accrued liabilities		26,997			22,061
Other assets		10,228			9,200
Gross deferred tax assets		116,816			117,470
Less valuation allowance		(56,359	)		(63,617	)
Total deferred tax assets		60,457			53,853
Deferred tax liabilities:
Property, plant and equipment		30,957			31,945
Other intangible assets		46,628			43,440
Convertible Notes		21,616			20,727
Other liabilities		2,400			4,992
Total deferred tax liabilities		101,601			101,104
Net deferred tax liabilities	$	(41,144	)	$	(47,251	)

Reconciliation Of Income Taxes At The Statutory Rate

	Fiscal year ended March 31,
	2012			2011			2010
United States statutory income tax expense (at 35%)	$	66,962		$	53,005		$	30,539
Increase (decrease) resulting from:
State income taxes, net of federal effect		1,592			3,035			(116	)
Nondeductible expenses, domestic manufacturing deduction and other		1,587			(1,848	)		3,799
Effect of foreign operations		(20,028	)		(14,841	)		(9,253	)
Valuation allowance		(2,821	)		(1,333	)		(18	)
Income tax expense	$	47,292		$	38,018		$	24,951

Reconciliation Of Unrecognized Tax Benefits

March 31, 2009	$	13,305
Increases related to current year tax positions		919
Increases related to prior year tax positions due to foreign currency translation		5
Decreases related to prior year tax position settled		(2,940	)
Lapse of statute of limitations		(539	)
March 31, 2010		10,750
Increases related to current year tax positions		2,896
Increases related to prior year tax positions		324
Increases related to prior year tax positions due to foreign currency translation		122
Decreases related to prior year tax position settled		(3,145	)
Lapse of statute of limitations		(302	)
March 31, 2011		10,645
Increases related to current year tax positions		5,032
Increases related to prior year tax positions		182
Increases related to prior year tax positions due to foreign currency translation		(28	)
Decreases related to prior year tax position settled		—
Lapse of statute of limitations		(2,886	)
March 31, 2012	$	12,945

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Retirement Plans (Summary Of Changes In AOCI) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Retirement Plans [Abstract]
New prior service cost		$ 905
Net loss/(gain) arising during the year	7,757	(3,505)	753
Effect of exchange rates on amounts included in AOCI	(176)	151	40
Amortization or curtailment recognition of prior service credit /(cost)	(83)	(62)	(142)
Amortization or settlement recognition of net gain/(loss)	(187)	(250)	(333)
Total recognized in other comprehensive income	$ 7,311	$ (2,761)	$ 318

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Earnings Per Share (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2012
Earnings Per Share [Abstract]
Convertible Notes	$ 172,500
Aggregate consideration on conversion shares	4,248,761

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Consolidated Statements Of Changes In Stockholders' Equity (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Consolidated Statements Of Changes In Stockholders' Equity [Abstract]
Pension funded status adjustment, tax expense (benefits)	$ (1,841)	$ 794	$ (367)
Unrealized income on derivative instruments, tax expense (benefits)	$ (1,909)	$ 5,251	$ 1,421

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Retirement Plans (Summary Of Amounts Recognized In The Balance Sheet) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
Retirement Plans [Abstract]
Other assets	$ 260	$ 2,513
Accrued expenses	(1,309)	(1,369)
Other liabilities	(30,752)	(27,403)
Amounts recognized in the consolidated balance sheets	$ (31,801)	$ (26,259)

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Property, Plant, And Equipment (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Property, Plant, And Equipment [Abstract]
Depreciation expense	$ 48,532	$ 43,517	$ 44,145
Interest capitalized	$ 797	$ 1,292	$ 929

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Retirement Plans (Significant Assumptions Used To Determine The Net Periodic Benefit Cost) (Details)	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
United States Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.70%	6.00%	6.50%
Expected return on plan assets	8.00%	8.00%	8.00%
Rate of compensation increase
Minimum [Member] | International Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.00%	4.30%	3.80%
Expected return on plan assets	5.50%	5.50%	5.50%
Rate of compensation increase	2.00%	2.00%	2.00%
Maximum [Member] | International Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.50%	6.00%	6.00%
Expected return on plan assets	7.00%	7.00%	7.00%
Rate of compensation increase	4.00%	3.50%	3.50%

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Inventories (Tables)

12 Months Ended

Mar. 31, 2012

Inventories [Abstract]

Summary Of Net Inventories

	March 31,
	2012		2011
Raw materials	$	100,538	$	92,928
Work-in-process		111,629		100,261
Finished goods		149,607		141,814
Total	$	361,774	$	335,003

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Accrued Expenses (Summary Of Accrued Expenses) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
Accrued Expenses [Abstract]
Payroll and benefits	$ 55,595	$ 58,794
Accrued selling expenses	26,269	24,257
Warranty	19,274	16,218
Income taxes payable	16,979	15,591
VAT and other non-income taxes	10,966	11,937
Freight	12,314	10,208
Deferred income	12,057	7,107
Interest rate swaps	3,628
Interest	2,040	2,471
Pension and social security	1,696	1,854
Restructuring	1,186	5,323
Other	26,399	30,940
Total	$ 188,403	$ 184,700

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Stockholders' Equity

12 Months Ended

Mar. 31, 2012

Stockholders' Equity [Abstract]

Stockholders' Equity

15. Stockholders' Equity

Preferred Stock and Common Stock

The Company's certificate of incorporation authorizes the issuance of up to 1,000,000 shares of preferred stock, par value $0.01 per share ("Preferred Stock"). At March 31, 2012 and 2011, no shares of Preferred Stock were issued or outstanding. The Board of Directors of the Company has the authority to specify the terms of any Preferred Stock at the time of issuance.

The following demonstrates the change in the number of shares of common stock outstanding during fiscal 2012:

Shares outstanding as of March 31, 2011	50,034,353
Repurchase of common shares	(2,646,885	)
Shares issued as part of equity-based compensation plans, net of equity awards surrendered for option price and taxes	412,661
Shares outstanding as of March 31, 2012	47,800,129

Treasury Stock

In fiscal 2012, the Company purchased 2,646,885 shares of its common stock for $58,383 from institutional shareholders and recorded the same as treasury stock. Treasury stock as of March 31, 2012 and 2011 was $78,183 and $19,800, respectively.

Accumulated Other Comprehensive Income

The components of accumulated other comprehensive income are as follows:

	Beginning Balance			Before-Tax Amount			Tax Benefit (Expense)			Net-of-Tax Amount			Ending Balance
March 31, 2012
Pension funded status adjustment	$	(3,512	)	$	(7,311	)	$	1,841		$	(5,470	)	$	(8,982	)
Unrealized gain (loss) on derivative instruments		4,436			(5,170	)		1,909			(3,261	)		1,175
Foreign currency translation adjustment		114,256			(32,356	)		—			(32,356	)		81,900
Accumulated other comprehensive income	$	115,180		$	(44,837	)	$	3,750		$	(41,087	)	$	74,093
March 31, 2011
Pension funded status adjustment	$	(5,479	)	$	2,761		$	(794	)	$	1,967		$	(3,512	)
Unrealized gain (loss) on derivative instruments		(5,034	)		14,721			(5,251	)		9,470			4,436
Foreign currency translation adjustment		77,717			36,539			—			36,539			114,256
Accumulated other comprehensive income	$	67,204		$	54,021		$	(6,045	)	$	47,976		$	115,180
March 31, 2010
Pension funded status adjustment	$	(4,794	)	$	(318	)	$	(367	)	$	(685	)	$	(5,479	)
Unrealized gain (loss) on derivative instruments		(7,660	)		4,047			(1,421	)		2,626			(5,034	)
Foreign currency translation adjustment		46,509			31,208			—			31,208			77,717
Accumulated other comprehensive income	$	34,055		$	34,937		$	(1,788	)	$	33,149		$	67,204

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Property, Plant, And Equipment (Tables)

12 Months Ended

Mar. 31, 2012

Property, Plant, And Equipment [Abstract]

Summary Of Property, Plant, And Equipment

	March 31,
	2012			2011
Land, buildings, and improvements	$	201,038		$	174,887
Machinery and equipment		511,599			475,818
Construction in progress		29,779			51,662
		742,416			702,367
Less accumulated depreciation		(389,201	)		(357,982	)
Total	$	353,215		$	344,385

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Retirement Plans (Summary Of Accumulated Benefit Obligation Related To All Defined Pension Plans) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
United States Plans [Member] | All Defined Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 14,040	$ 11,903
United States Plans [Member] | Defined Benefit Plans With An Accumulated Benefit Obligation In Excess Of The Fair Value Of Plan Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	14,040	11,903
Accumulated benefit obligation	14,040	11,903
Fair value of plan assets	9,192	8,746
International Plans [Member] | All Defined Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	50,416	46,225
International Plans [Member] | Unfunded Defined Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	25,508	24,413
Projected benefit obligation	26,892	25,533
International Plans [Member] | Defined Benefit Plans With An Accumulated Benefit Obligation In Excess Of The Fair Value Of Plan Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	28,003	25,560
Accumulated benefit obligation	26,445	24,440
Fair value of plan assets	$ 789

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Operations By Industry Segment And Geographic Area (Summary Of Financial Information Related To The Company's Business Segments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended																12 Months Ended
	Mar. 31, 2012		Jan. 01, 2012		Oct. 02, 2011		Jul. 03, 2011		Mar. 31, 2011		Jan. 02, 2011		Oct. 03, 2010		Jul. 04, 2010		Mar. 31, 2012		Mar. 31, 2011		Mar. 31, 2010
Segment Reporting Information [Line Items]
Total net sales	$ 592,754		$ 574,246		$ 547,140		$ 569,229		$ 548,054		$ 508,596		$ 472,843		$ 434,969		$ 2,283,369		$ 1,964,462		$ 1,579,385
Total intersegment sales																	134,949	[1]	119,076	[1]	75,534	[1]
Legal proceedings settlement income					900												900
Restructuring charges	(2,236)		(1,440)		(902)		(410)		(1,586)		(1,754)		(2,750)		(723)		(4,988)		(6,813)		(13,929)
Bargain purchase gain																					2,919
Total operating earnings	65,879	[2]	53,777	[2]	42,440	[2]	48,715	[2]	53,518	[3]	48,320	[3]	44,496	[3]	37,480	[3]	210,811	[2],[4]	183,814	[3],[4]	114,297	[4]
Property, plant, and equipment, net	353,215								344,385								353,215		344,385		315,141
Capital Expenditures																	48,943		59,940		45,111
Depreciation and Amortization																	50,360		44,393		44,851
Europe [Member]
Segment Reporting Information [Line Items]
Total net sales																	995,431		890,313		741,975
Total intersegment sales																	75,652		55,586		37,449
Legal proceedings settlement income																	900
Restructuring charges																	(4,988)		(6,813)		(13,212)
Bargain purchase gain																					2,919
Total operating earnings																	63,872		55,643		17,649
Property, plant, and equipment, net	161,854								169,056								161,854		169,056		156,953
Capital Expenditures																	21,631		22,034		20,624
Depreciation and Amortization																	25,451		21,564		22,348
Americas [Member]
Segment Reporting Information [Line Items]
Total net sales																	1,082,747		896,629		700,297
Total intersegment sales																	38,115		42,141		24,848
Restructuring charges																					(717)
Total operating earnings																	138,894		124,515		87,156
Property, plant, and equipment, net	144,701								142,263								144,701		142,263		138,217
Capital Expenditures																	20,862		22,368		21,089
Depreciation and Amortization																	21,466		19,842		19,189
Asia [Member]
Segment Reporting Information [Line Items]
Total net sales																	205,191		177,520		137,113
Total intersegment sales																	21,182		21,349		13,237
Total operating earnings																	12,133		10,469		20,502
Property, plant, and equipment, net	46,660								33,066								46,660		33,066		19,971
Capital Expenditures																	6,450		15,538		3,398
Depreciation and Amortization																	3,443		2,987		3,314
Reserve Power [Member]
Segment Reporting Information [Line Items]
Total net sales																	1,092,734		970,480		820,526
Motive Power [Member]
Segment Reporting Information [Line Items]
Total net sales																	$ 1,190,635		$ 993,982		$ 758,859

[1] Intersegment sales are presented on a cost plus basis which takes into consideration the effect of transfer prices between legal entities.

[2] Included in Operating earnings were restructuring charges of $410, $902, $1,440 and $2,236 for the first, second, third and fourth quarters of fiscal 2012, respectively. Operating earnings also included a legal proceedings settlement income of $900, in the second quarter of fiscal 2012.

[3] Included in Operating earnings were restructuring charges of $723, $2,750, $1,754 and $1,586 for the first, second, third and fourth quarters of fiscal 2011, respectively.

[4] The Company does not allocate interest expense or other (income) expense to the reportable segments.

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Stock-Based Compensation

12 Months Ended

Mar. 31, 2012

Stock-Based Compensation [Abstract]

Stock-Based Compensation

17. Stock-Based Compensation

As of March 31, 2012, the Company maintains the EnerSys 2010 Equity Incentive Plan ("2010 EIP"). The 2010 EIP reserves 3,177,477 shares of common stock for the grant of various classes of nonqualified stock options,  restricted stock units, market share units and other forms of equity-based compensation. Shares subject to any awards that expire without being exercised or that are forfeited or settled in cash shall again be available for future grants of awards under the 2010 EIP. Shares subject to awards that have been retained by the Company in payment or satisfaction of the exercise price and any applicable tax withholding obligation of an award shall not count against the limit described above, and only the number of shares delivered in the settlement of stock appreciation rights shall count against the limit.

At March 31, 2012, 2,872,490 shares are available for future grants. The Company's management equity incentive plans are intended to provide an incentive to employees and non-employee directors of the Company to remain in the service of the Company and to increase their interest in the success of the Company in order to promote the long-term interests of the Company. The plans seek to promote the highest level of performance by providing an economic interest in the long-term performance of the Company. The Company settles employee share-based compensation awards with newly issued shares.

Stock Options

Non-qualified stock options have been granted to employees under the equity incentive plans at prices not less than the fair market value of the shares on the dates the options were granted. Options issued in fiscal 2010 vest over a three-year or six-month period. Options become exercisable in equal installments over the vesting period. No non-qualified stock options were granted in fiscal 2012 or 2011. Options generally expire in 10 years, however options vesting in six months expire in 3 1/2 years.

The weighted average fair value of options granted in fiscal 2010 were $8.35 and $5.15, and were determined using the following assumptions:

	2010			2010
	10 Year Options			3.5 Year Options
Exercise price	$	16.20		$	16.24
Risk-free interest rate		2.01	%		0.93	%
Dividend yield		0	%		0	%
Expected life		5years			2years
Expected volatility		56.6	%		56.6	%
Weighted average fair value	$	8.35		$	5.15

For fiscal 2012, 2011 and 2010, the Company recognized $1,092 ($822 net of taxes), $2,333 ($1,844 net of taxes) and $2,993 ($2,095 net of taxes), respectively, of stock-based compensation expense associated with the stock option grants.

The following table summarizes the Company's stock option activity in the years indicated:

	Number of Options			Weighted Average Remaining Contract Term (Years)		Weighted Average Exercise Price		Aggregate Intrinsic Value
Options outstanding as of March 31, 2009		2,643,175			4.2	$	16.70	$	1,752
Granted		539,506					16.21		—
Exercised		(667,862	)				12.22		7,125
Canceled		(83,586	)				21.43		522
Options outstanding as of March 31, 2010		2,431,233			4.0	$	17.69	$	19,191
Exercised		(1,415,391	)				15.34		18,482
Canceled		(155,063	)				29.32		9
Options outstanding as of March 31, 2011		860,779			6.2	$	19.52	$	17,129
Exercised		(227,116	)				15.82		3,691
Options outstanding as of March 31, 2012		633,663			6.1	$	20.85	$	8,879
Options exercisable as of March 31, 2012		523,626			5.9	$	21.82	$	6,826
Options expected to vest after March 31, 2012		110,037			7.1	$	16.20	$	2,053

The following table summarizes information regarding stock options outstanding and exercisable at March 31, 2012:

	Options Outstanding						Options Exercisable
Range of Exercise Prices	Number of Options		Weighted Average Remaining Contractual Life		Weighted Average Exercise Price		Number of Options		Weighted Average Exercise Price
$10.01-15.00		65,954		3.1	$	14.12		65,954	$	14.12
$15.01-20.00		361,661		6.6		16.75		251,624		16.99
Over $20.00		206,048		6.1		30.19		206,048		30.19
		633,663		6.1	$	20.85		523,626	$	21.82

A summary of the status of the Company's non-vested options as of March 31, 2012, and changes during the year ended March 31, 2012, is presented below:

	Number of Options			Weighted Average Grant-Date Fair Value
Nonvested at March 31, 2011		357,903		$	8.70
Vested		(247,866	)		9.06
Nonvested at March 31, 2012		110,037		$	7.87

Restricted Stock Units and Market Share Units

In fiscal 2012, the Company granted to non-employee directors 35,632 deferred restricted stock units at the market price of $22.45 per restricted stock unit at the date of grant. The fiscal 2012 non-employee director awards vested immediately upon the date of grant and the payment of shares of common stock under this grant are payable upon such director's termination of service as a director. In fiscal 2011, the Company granted to non-employee directors 21,248 restricted stock units at the market price of $22.59 per restricted stock unit at the date of grant. The fiscal 2011 non-employee director awards vested thirteen months following the date of grant.

In fiscal 2012, the Company granted to management and other key employees 95,026 restricted stock units at the market price on that date of $35.79 per share and 224,397 market share units at the fair market value on that date of $48.36 per share. Restricted stock units are granted at the market price of the Company's common stock on the date of grant and vest and are settled in common stock 25% per year over a four-year period from the date of grant. Also, in fiscal 2012, the Company granted 9,340 restricted stock units, at various fair values, under deferred compensation plans.

Market share units are granted at fair value on the date of grant and vest and are settled in common stock on the third anniversary of the date of grant. Market share units are converted into between zero and two shares of common stock for each unit granted at the end of a three-year performance cycle. The conversion ratio is calculated by dividing the average closing share price of the Company's common stock during the ninety calendar days immediately preceding the vesting date by the average closing share price of the Company's common stock during the ninety calendar days immediately preceding the grant date, with the resulting quotient capped at two. This quotient is then multiplied by the number of market share units granted to yield the number of shares of common stock to be delivered on the vesting date. The fair value of the market share units granted in fiscal 2012 was estimated at the date of grant using a binomial lattice model with the following assumptions: a risk-free interest rate of 0.93%, dividend yield of zero, time to maturity of 3 years and expected volatility of 45.5%.

In fiscal 2011, the Company granted to management and other key employees 291,701 restricted stock units at the market price on that date of $25.67 per share and 124,091 market share units at the fair market value on that date of $34.45 per share. These restricted stock units are granted at the fair market value of the Company's common stock on the date of grant and vest 25% per year over a four-year period from the date of grant. The fair value of the market share units granted in fiscal 2011 was estimated at the date of grant using a binomial lattice model with the following assumptions: a risk-free interest rate of 1.30%, dividend yield of zero, time to maturity of 3 years and expected volatility of 43.0%.

A summary of the changes in restricted stock units and market share units awarded to employees and directors that were outstanding under the Company's equity compensation plans during fiscal 2012 is presented below:

	Restricted Stock Units (RSU) / Market Share Units  (MSU)
	Number of RSU and  MSU			Weighted Average Grant Date Fair Value
Non-vested awards as of March 31, 2011		865,392		$	23.97
Granted		364,395			40.76
Vested		(259,151	)		22.28
Canceled		(6,833	)		11.49
Non-vested awards as of March 31, 2012		963,803		$	30.84

The Company recognized equity-based compensation expense related to the vesting of restricted stock units and market share units of approximately $10,493, with a related tax benefit of $2,599 for fiscal 2012, $6,723, with a related tax benefit of $1,659 for fiscal 2011, and $3,968, with a related tax benefit of $1,190 for fiscal 2010.

All Award Plans

As of March 31, 2012, unrecognized compensation expense associated with the non-vested incentive awards outstanding was $18,451 and is expected to be recognized over a weighted average period of nineteen months.

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Debt (India Term Loan) (Narrative) (Details) (India Term Loan [Member]) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012 USD ($)	Mar. 31, 2012 INR
Debt Instrument [Line Items]
Syndicated term loan	$ 5,383	273,780
Interest rate of debt instrument	15.10%	15.10%
Interest rate adjustment period	2 years	2 years
Quarterly installments	$ 295	15,000
Duration of payments	5 years	5 years

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Stock-Based Compensation (Summary Of Weighted Average Fair Value Of Options Granted) (Details) (USD $)					12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010	Mar. 31, 2009	Mar. 31, 2010 10 Year Options [Member] Y	Mar. 31, 2010 3.5 Year Options [Member] Y
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price	$ 20.85	$ 19.52	$ 17.69	$ 16.70	$ 16.20	$ 16.24
Risk-free interest rate					2.01%	0.93%
Dividend yield					0.00%	0.00%
Expected life, years					5	2
Expected volatility					56.60%	56.60%
Weighted average fair value					$ 8.35	$ 5.15

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Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011		Mar. 31, 2010
Cash flows from operating activities
Net earnings	$ 143,967	$ 113,426	[1]	$ 62,304
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	50,360	44,393		44,851
Derivatives not designated in hedging relationships:
Net losses	1,083
Cash settlements	(3,763)
Provision for doubtful accounts	1,395	1,513		2,712
Deferred income taxes	(3,227)	(3,064)		6,975
Non-cash interest expense	7,983	7,776		7,163
Stock-based compensation	11,585	9,056		6,964
Write-off of deferred financing fees		2,308
Bargain purchase gain				(2,919)
Gain on disposal of fixed assets	(432)			(912)
Changes in assets and liabilities, net of effects of acquisitions:
Accounts receivable	7,106	(61,892)		(7,303)
Inventory	(19,655)	(67,250)		(23,445)
Prepaid expenses and other current assets	8,834	(15,658)		(1,075)
Other assets	(955)	(2,552)		(1,218)
Accounts payable	(12,377)	42,422		59,116
Accrued expenses	13,505	(3,822)		(5,816)
Other liabilities	(1,213)	9,803		(10,795)
Net cash provided by operating activities	204,196	76,459		136,602
Cash flows from investing activities
Capital expenditures	(48,943)	(59,940)		(45,111)
Purchase of businesses, net of cash acquired	(24,553)	(32,200)		(33,242)
Proceeds from disposal of property, plant, and equipment	76	479		1,109
Net cash used in investing activities	(73,420)	(91,661)		(77,244)
Cash flows from financing activities
Net (decrease) increase in short-term debt	(462)	3,084		(7,436)
Proceeds from revolving credit borrowings	111,550	100,000
Repayment of revolving credit borrowings	(132,150)
Proceeds from long-term debt - other		6,112
Payments of long-term debt - other	(308)	(212,238)		(25,243)
Deferred financing fees incurred in connection with refinancing prior credit facility		(3,500)
Capital lease obligations and other	(1,375)	(111)		878
Net effect from exercising of stock options and vesting of equity awards	974	17,894		5,042
Excess tax benefits from exercise of stock options and vesting of equity awards	1,772	6,082		2,287
Purchase of treasury stock	(58,383)
Net cash used in financing activities	(78,382)	(82,677)		(24,472)
Effect of exchange rate changes on cash	(773)	5,706		2,995
Net increase (decrease) in cash and cash equivalents	51,621	(92,173)		37,881
Cash and cash equivalents at beginning of year	108,869	201,042		163,161
Cash and cash equivalents at end of year	$ 160,490	$ 108,869		$ 201,042

[1] Included in Net earnings of fiscal 2011 were charges related to refinancing of $8,155 in the fourth quarter of fiscal 2011.

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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
Consolidated Balance Sheets [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 10,022	$ 10,547
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	135,000,000	135,000,000
Common stock, shares issued	52,247,014	51,834,353
Common stock, shares outstanding	47,800,129	50,034,353
Treasury stock, shares	4,446,885	1,800,000

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Other Liabilities

12 Months Ended

Mar. 31, 2012

Other Liabilities [Abstract]

Other Liabilities

10. Other Liabilities

Other long-term liabilities consist of the following:

	March 31,
	2012		2011
Pension and profit sharing obligation	$	35,804	$	29,297
Warranty		22,793		19,788
Long-term income taxes liabilities		13,520		11,320
Deferred income		6,094		3,839
Interest rate swap liabilities		244		5,847
Other		14,013		6,552
Total	$	92,468	$	76,643

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Stockholders' Equity (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, par value	$ 0.01	$ 0.01
Number of shares of common stock purchased	2,646,885
Repurchased common stock value	$ 58,383
Treasury stock, Value	$ 78,183	$ 19,800
Maximum [Member]
Preferred stock, shares authorized	1,000,000

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Retirement Plans (Summary Of Change In Plan Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
United States Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the beginning of the period	$ 8,746	$ 7,859
Actual return on plan assets	420	1,102
Employer contributions	641	366
Benefits paid, inclusive of plan expenses	(615)	(581)
Fair value of plan assets at the end of the period	9,192	8,746
Funded status deficit	(4,848)	(3,157)
International Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at the beginning of the period	25,779	22,712
Actual return on plan assets	1,555	1,751
Employer contributions	1,505	1,424
Benefits paid, inclusive of plan expenses	(1,709)	(1,481)
Plan settlements	(40)
Foreign currency translation adjustments	(148)	1,373
Fair value of plan assets at the end of the period	26,942	25,779
Funded status deficit	$ (26,953)	$ (23,102)

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Retirement Plans (Components Of Net Periodic Pension Cost) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
United States Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 285	$ 250	$ 224
Interest cost	668	646	635
Expected return on plan assets	(706)	(624)	(491)
Amortization and deferral	238	248	458
Net periodic benefit cost	485	520	826
International Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	645	603	621
Interest cost	2,504	2,503	2,520
Expected return on plan assets	(1,787)	(1,615)	(1,256)
Amortization and deferral	32	53	(43)
Net periodic benefit cost	$ 1,394	$ 1,544	$ 1,842

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Operations By Industry Segment And Geographic Area (Narrative) (Details)	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Segment Reporting Information [Line Items]
Operations in number of countries	100
United States [Member]
Segment Reporting Information [Line Items]
Percentage of sales to customers	42.60%	41.30%	40.40%

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Other (Income) Expense, Net And Charges Related To Refinancing (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Other (Income) Expense, Net And Charges Related To Refinancing [Abstract]
Charges related to refinancing	$ 8,155		$ 8,155
Write offs of deferred financing fees			2,308
Interest rate swap agreements, losses from discontinued hedging accounting			$ 5,847

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Document And Entity Information (USD $)	12 Months Ended
	Mar. 31, 2012	May 21, 2012	Oct. 02, 2011
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Mar. 31, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	FY
Trading Symbol	ENS
Entity Registrant Name	EnerSys
Entity Central Index Key	0001289308
Current Fiscal Year End Date	--03-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		47,945,876
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	Yes
Entity Public Float			$ 953,580,148

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Subsequent Events (Details)	0 Months Ended
	May 14, 2012
Restricted Stock Units [Member]
Subsequent Event [Line Items]
Stock unit grant during period	223,224
Restricted stock units vest	25.00%
Vesting period	4 years
Market Share Units [Member]
Subsequent Event [Line Items]
Stock unit grant during period	292,123
Vesting period	3 years

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Fair Value Of Financial Instruments

12 Months Ended

Mar. 31, 2012

Fair Value Of Financial Instruments [Abstract]

Fair Value Of Financial Instruments

11. Fair Value Of Financial Instruments

FASB guidance defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. This guidance includes a fair value hierarchy that is intended to increase consistency and comparability in fair value measurements and related disclosures. The fair value hierarchy is based on inputs to valuation techniques that are used to measure fair value that are either observable or unobservable. Observable inputs reflect assumptions market participants would use in pricing an asset or liability based on market data obtained from independent sources while unobservable inputs reflect a reporting entity's pricing based upon their own market assumptions. The Company uses the following valuation techniques to measure fair value for its financial assets and financial liabilities:

Level 1	Inputs are unadjusted quoted prices in active markets for identical assets or liabilities.
Level 2	Inputs are quoted prices for similar assets or liabilities in an active market, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable and market-corroborated inputs which are derived principally from or corroborated by observable market data.
Level 3	Inputs are derived from valuation techniques in which one or more significant inputs or value drivers are unobservable.

The following tables represent the financial assets and (liabilities), measured at fair value on a recurring basis as of March 31, 2012 and March 31, 2011 and the basis for that measurement:

	Total Fair Value Measurement March 31, 2012			Quoted Price in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Interest rate swap agreements	$	(3,872	)	$	—	$	(3,872	)	$	—
Lead forward contracts		(851	)		—		(851	)		—
Foreign currency forward contracts		782			—		782			—
Total derivatives	$	(3,941	)	$	—	$	(3,941	)	$	—

	Total Fair Value Measurement March 31, 2011			Quoted Price in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Interest rate swap agreements	$	(5,847	)	$	—	$	(5,847	)	$	—
Lead forward contracts		9,575			—		9,575			—
Foreign currency forward contracts		(2,591	)		—		(2,591	)		—
Total derivatives	$	1,137		$	—	$	1,137		$	—

The fair value of interest rate swap agreements are based on observable prices as quoted for receiving the variable three month LIBOR and paying fixed interest rates and, therefore, were classified as Level 2.

The fair value of lead forward contracts are calculated using observable prices for lead as quoted on the London Metal Exchange ("LME") and, therefore, were classified as Level 2.

The fair value for foreign currency forward contracts are based upon current quoted market prices and are classified as Level 2 based on the nature of the underlying market in which these derivatives are traded.

Financial Instruments

The fair value of the Company's cash and cash equivalents, accounts receivable and accounts payable approximate carrying value due to their short maturities.

The fair value of the Company's 2011 Credit Facility, the China Term Loan, the India Term Loan and short-term debt approximate their carrying value, as they are variable rate debt and the current terms are comparable to market terms as of the balance sheet dates.

The Convertible Notes, with a face value of $172,500, were issued when the Company's stock price was trading at $30.19 per share. On March 31, 2012, the Company's stock price closed at $34.65 per share. The Convertible Notes have a conversion option at $40.60 per share, and due to current conditions in the financial markets, the Company's Convertible Notes were trading at 116% of face value on March 31, 2012, and 125% of face value on March 31, 2011. As of March 31, 2012 and 2011, the unamortized discount on the Convertible Notes was $24,228 and $30,663, respectively.

The carrying amounts and estimated fair values of the Company's derivatives and Convertible Notes at March 31, 2012 and 2011 were as follows:

	March 31, 2012						March 31, 2011
	Carrying Amount			Fair Value			Carrying Amount			Fair Value
Financial assets:
Derivatives (1)	$	782		$	782		$	9,575		$	9,575
Financial liabilities:
Convertible Notes	$	148,272	(2)	$	200,100	(3)	$	141,837	(2)	$	215,625	(3)
Derivatives (1)		4,723			4,723			8,438			8,438

⁽¹⁾  Represents interest rate swap agreements, lead and foreign currency hedges (see Note 12 for asset and liability positions of the interest rate swap agreements, lead and foreign currency hedges at March 31, 2012 and March 31, 2011).

⁽²⁾  The carrying amounts of the Convertible Notes at March 31, 2012 and March 31, 2011 represent the $172,500 principal value, less the unamortized debt discount (see Note 8).

⁽³⁾  The fair value amounts of the Convertible Notes represent the trading values of the Convertible Notes with a principal value of $172,500 at March 31, 2012 and March 31, 2011.

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Derivative Financial Instruments (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Derivatives, Fair Value [Line Items]
Foreign currency forward contracts	$ 42,121	$ 71,930
Lead Hedge Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional amount	60,000	63,400
Cost Of Goods Sold [Member] | Foreign Currency Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Pretax gain reclassified from accumulated other comprehensive income	1,784
Not Designated As Hedging Instrument [Member] | Interest Rate Swap Agreements [Member]
Derivatives, Fair Value [Line Items]
Change in fair value recorded in other expense, net	977
Interest rate swap agreements converted into fixed rate basis	85,000	85,000
Not Designated As Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional amount	11,410
Change in fair value recorded in other expense, net	$ 106
Not Designated As Hedging Instrument [Member] | Minimum [Member] | Interest Rate Swap Agreements [Member]
Derivatives, Fair Value [Line Items]
Derivative, maturity date	Feb. 01, 2013
Not Designated As Hedging Instrument [Member] | Maximum [Member] | Interest Rate Swap Agreements [Member]
Derivatives, Fair Value [Line Items]
Derivative, maturity date	May 01, 2013

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Retirement Plans (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Equity investments target range, minimum	50.00%
Equity investments target range, maximum	70.00%
Extended terms of return on portfolio investment, minimum	3 years
Extended terms of return on portfolio investment, maximum	5 years
Expected cash contributions to pension plans in 2013	$ 2,571
Germany And France Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation	22,874	21,706
First Percentage Of Wages Contribution [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of wages contributed for total match	4.00%
Next Percentage Of Wages Contribution [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of wages contributed for total match	2.00%
Defined Contribution Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer expenses	$ 5,146	$ 5,025	$ 3,909
Defined Contribution 401(k) Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Contribution description	All eligible employees of the amended 401(k) Plan receive a matching contribution of 100% of the first 4% of wages contributed and 50% of the next 2% of wages contributed for a total match of up to 5% by the Company.
Defined Contribution Amended U.K. Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Contribution description	Active members of the Amended U.K. Plan as of February 1, 2009 receive a matching contribution from the Company up to 4% of Pensionable Salary and an enhanced Company contribution in excess of this in line with the rules of the plan. New eligible employees of the Amended U.K. Plan receive a matching contribution from the Company up to 5% of pensionable salary, at various rates as provided by the plan.
Defined Contribution Amended U.K. Plan [Member] | Pensionable Salary [Member]
Defined Benefit Plan Disclosure [Line Items]
Matching contribution	5.00%
Matching contribution received in excess of Pensionable Salary	4.00%
Defined Contribution, Amended 401(k) Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of total match up, by the company	5.00%
Defined Contribution, Amended 401(k) Plan [Member] | First Percentage Of Wages Contribution [Member]
Defined Benefit Plan Disclosure [Line Items]
Matching contribution	100.00%
Defined Contribution, Amended 401(k) Plan [Member] | Next Percentage Of Wages Contribution [Member]
Defined Benefit Plan Disclosure [Line Items]
Matching contribution	50.00%

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Consolidated Statements Of Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2012		Mar. 31, 2011		Mar. 31, 2010
Consolidated Statements Of Income [Abstract]
Net sales	$ 2,283,369		$ 1,964,462		$ 1,579,385
Cost of goods sold	1,770,664		1,514,618		1,218,481
Gross profit	512,705	[1]	449,844		360,904
Operating expenses	297,806		259,217		235,597
Legal proceedings settlement income	(900)
Restructuring charges	4,988		6,813		13,929
Bargain purchase gain					(2,919)
Operating earnings	210,811	[2],[3]	183,814	[1],[3]	114,297	[3]
Interest expense	16,484		22,038		22,658
Charges related to refinancing			8,155
Other (income) expense, net	3,068		2,177		4,384
Earnings before income taxes	191,259		151,444		87,255
Income tax expense	47,292		38,018		24,951
Net earnings	143,967		113,426	[4]	62,304
Net losses attributable to noncontrolling interests	(36)
Net earnings attributable to EnerSys stockholders	$ 144,003		$ 113,426		$ 62,304
Net earnings per common share attributable to EnerSys stockholders:
Basic	$ 2.95		$ 2.30		$ 1.29
Diluted	$ 2.93		$ 2.27		$ 1.28
Weighted-average shares of common stock outstanding:
Basic	48,748,205		49,376,132		48,122,207
Diluted	49,216,035		50,044,246		48,834,095

[1] Included in Operating earnings were restructuring charges of $723, $2,750, $1,754 and $1,586 for the first, second, third and fourth quarters of fiscal 2011, respectively.

[2] Included in Operating earnings were restructuring charges of $410, $902, $1,440 and $2,236 for the first, second, third and fourth quarters of fiscal 2012, respectively. Operating earnings also included a legal proceedings settlement income of $900, in the second quarter of fiscal 2012.

[3] The Company does not allocate interest expense or other (income) expense to the reportable segments.

[4] Included in Net earnings of fiscal 2011 were charges related to refinancing of $8,155 in the fourth quarter of fiscal 2011.

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Goodwill And Other Intangible Assets

12 Months Ended

Mar. 31, 2012

Goodwill And Other Intangible Assets [Abstract]

Goodwill And Other Intangible Assets

5. Goodwill and Other Intangible Assets

Information regarding the Company's other intangible assets are as follows:

	March 31,
	2012							2011
	Gross Amount		Accumulated Amortization			Net Amount		Gross Amount		Accumulated Amortization			Net Amount
Indefinite-lived intangible assets:
Trademarks	$	86,745	$	(953	)	$	85,792	$	83,021	$	(953	)	$	82,068
Finite-lived intangible assets:
Customer relationships		14,330		(2,839	)		11,491		11,064		(1,880	)		9,184
Non-compete		2,602		(1,224	)		1,378		2,117		(954	)		1,163
Patents		5,230		(615	)		4,615		3,402		(210	)		3,192
Trademarks		2,003		(643	)		1,360		3,771		(559	)		3,212
Licenses		2,640		(194	)		2,446		82		(82	)		-
Total	$	113,550	$	(6,468	)	$	107,082	$	103,457	$	(4,638	)	$	98,819

The Company's amortization expense, related to finite-lived intangible assets was $1,828, $876, and $706, for the years ended March 31, 2012, 2011 and 2010, respectively. The expected amortization expense based on the finite-lived intangible assets as of March 31, 2012, is $2,463 in 2013, $2,238 in 2014, $2,124 in 2015, $2,092 in 2016 and $1,966 in 2017.

The changes in the carrying amount of goodwill by business segment are as follows:

	Fiscal year ended March 31, 2012
	Europe			Americas			Asia		Total
Balance at beginning of year	$	177,881		$	143,225		$	22,560	$	343,666
Goodwill acquired during the year		1,250			7,973			1,500		10,723
Adjustments related to the finalization of purchase accounting for prior year acquisitions		374			5			-		379
Foreign currency translation		(7,977	)		(449	)		719		(7,707	)
Balance at end of year	$	171,528		$	150,754		$	24,779	$	347,061

	Fiscal year ended March 31, 2011
	Europe		Americas		Asia		Total
Balance at beginning of year	$	162,641	$	132,915	$	21,709	$	317,265
Goodwill acquired during the year		7,710		7,591		-		15,301
Adjustments related to the finalization of purchase accounting for prior year acquisitions		24		2,250		-		2,274
Foreign currency translation		7,506		469		851		8,826
Balance at end of year	$	177,881	$	143,225	$	22,560	$	343,666

The Company estimated tax-deductible goodwill to be approximately $12,745 and $14,982 as of March 31, 2012 and 2011, respectively.

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Property, Plant, And Equipment

12 Months Ended

Mar. 31, 2012

Property, Plant, And Equipment [Abstract]

Property, Plant, And Equipment

4. Property, Plant, and Equipment

Property, plant, and equipment consist of:

	March 31,
	2012			2011
Land, buildings, and improvements	$	201,038		$	174,887
Machinery and equipment		511,599			475,818
Construction in progress		29,779			51,662
		742,416			702,367
Less accumulated depreciation		(389,201	)		(357,982	)
Total	$	353,215		$	344,385

Depreciation expense for the fiscal years ended March 31, 2012, 2011 and 2010 totaled $48,532, $43,517, and $44,145, respectively. Interest capitalized in connection with major construction projects amounted to $797, $1,292, and $929 for the fiscal years ended March 31, 2012, 2011 and 2010, respectively.

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Secondary Offerings Of Common Shares

12 Months Ended

Mar. 31, 2012

Secondary Offerings Of Common Shares [Abstract]

Secondary Offerings Of Common Shares

16. Secondary Offerings of Common Shares

In fiscal 2011 and 2010, certain of the Company's stockholders sold 2,845,869 and 3,200,000 shares of the Company's common stock pursuant to an effective shelf registration statement filed with the Securities and Exchange Commission on May 19, 2008.

The offered shares were sold by those stockholders of the Company, including affiliates of Metalmark Capital LLC and certain other institutional stockholders. The Company did not receive any proceeds from the common stock offerings; however, under the terms of its securityholder agreement, the Company did incur fees related to the offerings in fiscal 2011 and fiscal 2010 of $615 and $150, respectively.

There were no secondary offerings in fiscal 2012.

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Derivative Financial Instruments

12 Months Ended

Mar. 31, 2012

Derivative Financial Instruments [Abstract]

Derivative Financial Instruments

12. Derivative Financial Instruments

The Company utilizes derivative instruments to reduce its exposure to commodity price, foreign exchange risks and interest rates, under established procedures and controls. The Company does not enter into derivative contracts for speculative purposes. The Company's agreements are with creditworthy financial institutions and the Company anticipates performance by counterparties to these contracts and therefore no material loss is expected.

Derivatives in Cash Flow Hedging Relationships

Lead Hedge Forward Contracts

The Company enters into lead hedge forward contracts to fix the price for a portion of lead purchases. Management considers the lead hedge forward contracts to be effective against changes in the cash flows of the underlying lead purchases based on the criteria under FASB guidance. The vast majority of such contracts are for a period not extending beyond one year and the notional amounts at March 31, 2012 and  2011 were $60.0 million and $63.4 million pounds, respectively.

Foreign Currency Forward Contracts

The Company purchases lead and other commodities in certain countries where the foreign currency exposure is different from the functional currency of that country. The Company uses foreign currency forward contracts to hedge a portion of the Company's foreign currency exposures for lead and other commodities purchases so that gains and losses on these contracts offset changes in the underlying foreign currency denominated exposures. Each contract is for a period not extending beyond one year. As of March 31, 2012 and 2011, the Company had entered into a total of $42,121 and $71,930, respectively, of such contracts.

In the coming twelve months, the Company anticipates that $1,784 of pretax gain relating to lead and foreign currency forward contracts will be reclassified from AOCI as part of cost of goods sold. This amount represents the current unrealized impact of hedging lead and foreign exchange rates, which will change as market rates change in the future, and will ultimately be realized in the income statement as an offset to the corresponding actual changes in lead costs to be realized in connection with the variable lead cost and foreign exchange rates being hedged.

Derivatives not Designated in Hedging Relationships

Interest Rate Swap Agreements

As of March 31, 2012 and March 31, 2011, the Company maintained interest rate swap agreements that converted $85,000 of variable-rate debt to a fixed-rate basis, utilizing the three-month LIBOR, as a floating rate reference. These agreements, which expire between February 2013 and May 2013, no longer qualified for hedge accounting at the end of fiscal 2011 as a result of the refinancing of the Company's previous credit facility. Changes in the fair value of these agreements of $977 in expense during the twelve months of fiscal 2012 have been recorded in the consolidated statements of income in other (income) expense, net. In fiscal 2011, the changes in the fair value of these agreements were recorded in AOCI.

Foreign Currency Forward Contracts

The Company also enters into foreign currency forward contracts to economically hedge foreign currency fluctuations on intercompany loans and foreign currency denominated receivables. These are not designated as hedging instruments. The notional amount of these contracts was $11,410 as of March 31, 2012. Net changes in the fair value of these agreements of $106 in expense during the twelve months of fiscal 2012 have been recorded in the consolidated statements of income in other (income) expense, net.

Presented below in tabular form is information on the location and amounts of derivative fair values in the consolidated balance sheets and derivative gains and losses in the Consolidated Statements of Income:

Fair Value of Derivative Instruments

March 31, 2012 and 2011

	Derivatives and Hedging Activities Designated as Cash Flow Hedges				Derivatives and Hedging Activities Not Designated as Hedging  Instruments
	March 31, 2012		March 31, 2011		March 31, 2012		March 31, 2011
Prepaid and other current assets
Lead hedge forward contracts	$	—	$	9,575	$	—	$	—
Foreign currency forward contracts		670		—		112		—
Other assets		30		—		—		—
Total assets	$	700	$	9,575	$	112	$	—
Accrued expenses
Interest rate swap agreements	$	—	$	—	$	3,628	$	—
Lead hedge forward contracts		881		—		—		—
Foreign currency forward contracts		—		2,591		—		—
Other liabilities
Interest rate swap agreements		—		—		244		5,847
Total liabilities	$	881	$	2,591	$	3,872	$	5,847

The Effect of Derivative Instruments on the Consolidated Statements of Income

For the fiscal year ended March 31, 2012

Derivatives Designated as Cash Flow Hedges	Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)			Location of Gain (Loss)  Reclassified from AOCI into Income (Effective Portion)	Gain (Loss) Reclassified from AOCI into Income (Effective Portion)
Lead hedge forward contracts	$	(9,731	)	Cost of goods sold	$	(831	)
Foreign currency forward contracts		(152	)	Cost of goods sold		(3,882	)
Total	$	(9,883	)		$	(4,713	)

Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss) Recognized in Income on Derivative	Gain (Loss)
Interest rate swap contracts	Other (income) expense, net	$	(977	)
Foreign currency forward contracts	Other (income) expense, net		(106	)
Total		$	(1,083	)

The Effect of Derivative Instruments on the Consolidated Statements of Income

For the fiscal year ending March 31, 2011

Derivatives in a Cash Flow Hedging Relationship	Gain (Loss) Recognized  in AOCI on Derivative (Effective Portion)			Location of Gain (Loss)  Reclassified from AOCI into Income (Effective Portion)	Gain (Loss) Reclassified from AOCI into Income (Effective Portion)
Interest rate swap contracts	$	(2,835	)	Interest expense	$	(6,698	)
Lead hedge forward contracts		15,930		Cost of goods sold		6,417
Foreign currency forward contracts		(4,031	)	Cost of goods sold		471
Total	$	9,064			$	190

Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss) Recognized in Income on Derivative	Gain (Loss)
Interest rate swap contracts	Charges related to refinancing	$	(5,847	)
Total		$	(5,847	)

The Effect of Derivative Instruments on the Consolidated Statements of Income

For the fiscal year ending March 31, 2010

Derivatives in a Cash Flow Hedging Relationship	Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)			Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	Gain (Loss) Reclassified from AOCI into Income (Effective Portion)
Interest rate swap contracts	$	(3,141	)	Interest expense	$	(7,059	)
Lead hedge forward contracts		9,844		Cost of goods sold		11,973
Foreign currency forward contracts		2,679		Cost of goods sold		428
Total	$	9,382				$5,342

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Income Taxes (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Operating Loss Carryforwards [Line Items]
Income taxes paid	$ 38,482	$ 41,800	$ 22,553
United States federal net operating loss carryforwards	11,139
Limited by Internal Revenue Code	3,375
Operating loss carryforwards, expiration date	2023
Valuation allowance	793	5,432
Net operating loss carryforwards foreign subsidiaries	235,000
Operating loss carryforwards, life period, years	20 years
Net operating loss carryforwards for state tax purposes	45,559
Tax benefit	47,292	38,018	24,951
Decrease deferred tax assets operating loss carry forwards	2,162
Net operating loss carryforwards, state expiration period, years	20 years
Effective income tax rates	24.70%	25.10%	28.60%
Tax benefits due to the utilization of net operating loss carryforwards	2,940	2,498
Undistributed earnings of foreign subsidiaries	494,000
Balance of unrecognized tax benefits recognized, period	12 months
Tax related interest and penalties	575	675
Domestic [Member]
Operating Loss Carryforwards [Line Items]
Tax benefit	2,477
Foreign [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance associated with certain foreign and state tax jurisdictions	53,206	55,738
State [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance associated with certain foreign and state tax jurisdictions	$ 2,360	$ 2,447

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Debt

12 Months Ended

Mar. 31, 2012

Debt [Abstract]

Debt

8. Debt

Summary of Long-Term Debt

The following summarizes the Company's long-term debt:

	March 31,
	2012		2011
3.375% Convertible Notes, net of discount, due 2038	$	148,272	$	141,837
2011 Credit Facility due 2016		79,400		100,000
China Term Loan due 2017		6,034		6,112
India Term Loan due 2017		5,383		-
Other		40		43
		239,129		247,992
Less current portion		2,540		43
Total long-term debt	$	236,589	$	247,949

2011 Senior Secured Revolving Credit Facility

On March 29, 2011, the Company entered into a $350,000 senior secured revolving credit facility ("2011 Credit Facility"). The 2011 Credit Facility matures on March 31, 2016. This facility includes an early termination provision under which the Company is required to meet a liquidity test in February 2015 related to its capacity to meet certain potential obligations related to the Convertible Notes in June 2015. Borrowings under the 2011 Credit Facility bear interest at a floating rate based, at the Company's option, upon (i) LIBOR plus an applicable percentage (currently 1.25%), (ii) the greater of the Federal Funds rate plus 0.50% or the prime rate, or one-month LIBOR plus 1.0%, plus an applicable percentage (currently 0.25%). There are no prepayment penalties on loans under the 2011 Credit Facility. The interest rate as of March 31, 2012 was 1.60%.

Obligations under the 2011 Credit Facility are secured by substantially all of the Company's existing and future acquired assets, including substantially all of the capital stock of the Company's United States subsidiaries that are guarantors under the new credit facility, and 65% of the capital stock of certain of the Company's foreign subsidiaries that are owned by the Company's United States companies.

China Term Loan

        During the fourth quarter of fiscal 2011, the Company completed the financing of a 75,000 Chinese Renminbi (RMB) ($11,909) credit facility ("China Term Loan"). This is a six year term loan to provide a portion of the capital requirements for the Company's operations in China. At March 31, 2012, the Company had drawn RMB 38,000 ($6,034). This term loan currently bears interest at a rate of 7.26% per annum, adjusted annually, based on the official Peoples Bank of China Bank Rate and is payable in quarterly installments of RMB 2,000 ($318) commencing in April 2012.

India Term Loan

During the fourth quarter of fiscal 2012, the Company entered into a joint venture with Energy Leader Batteries India Limited in India, where the Company acquired majority ownership. The joint venture had, at March 31, 2012, a syndicated term loan ("India Term Loan") with an outstanding balance of 273,780 Indian Rupee (INR) ($5,383). The India Term Loan bears interest at a rate of 15.1% per annum adjusted every two years based on the prevailing Indian Benchmark Prime Lending Rate ("BPLR") and is payable in equal quarterly installments of 15,000 INR ($295) over five years.

Senior Unsecured 3.375% Convertible Notes

On May 28, 2008, the Company completed a registered offering of $172,500 aggregate principal amount of senior unsecured 3.375% Convertible Notes Due 2038 ("Convertible Notes") (see prospectus and supplemental indenture dated May 28, 2008). The Company received net proceeds of $168,200 after the deduction of commissions and offering expenses. The Company used all of the net proceeds to repay a portion of its then existing 2004 senior secured credit facility.

The Convertible Notes are general senior unsecured obligations and rank equally with the Company's existing and future senior unsecured obligations and are junior to any of the Company's future secured obligations to the extent of the value of the collateral securing such obligations. The Convertible Notes are not guaranteed, and are structurally subordinate in right of payment to, all of the (i) existing and future indebtedness and other liabilities of the Company's subsidiaries and (ii) preferred stock of the Company's subsidiaries to the extent of their respective liquidation preferences.

The Convertible Notes require the semi-annual payment of interest in arrears on June 1 and December 1 of each year beginning December 1, 2008, at 3.375% per annum on the principal amount outstanding. The Convertible Notes will accrete principal beginning on June 1, 2015 and will bear contingent interest, if any, beginning with the six-month interest period commencing on June 1, 2015 under certain circumstances. The Convertible Notes will mature on June 1, 2038. Prior to maturity the holders may convert their Convertible Notes into shares of the Company's common stock at any time after March 1, 2015 or prior to that date under certain circumstances. When issued, the initial conversion rate was 24.6305 shares per $1,000 principal amount of Convertible Notes, which was equivalent to an initial conversion price of $40.60 per share.

At any time after June 6, 2015, the Company may at its option redeem the Convertible Notes, in whole or in part, for cash, at a redemption price equal to 100% of the principal amount of Convertible Notes to be redeemed, plus any accrued and unpaid interest. A holder of Convertible Notes may require the Company to repurchase some or all of the holder's Convertible Notes for cash upon the occurrence of a fundamental change as defined in the indenture and on each of June 1, 2015, 2018, 2023, 2028 and 2033 at a price equal to 100% of the principal amount of the Convertible Notes being repurchased, plus accrued and unpaid interest, if any, in each case. It is the Company's current intent to settle the principal amount of any conversions in cash, and any additional conversion consideration in cash, shares of EnerSys common stock or a combination of cash and shares. The Convertible Notes will mature on June 1, 2038, unless earlier converted, redeemed or repurchased.

If applicable, the Company will pay a make-whole premium on Convertible Notes converted in connection with certain fundamental changes that occur prior to June 6, 2015. The amount of the make-whole premium, if any, will be based on the Company's stock price and the effective date of the fundamental change. The indenture contains a detailed description of how the make-whole premium will be determined and a table showing the make-whole premium that would apply at various stock prices. No make-whole premium would be paid if the price of the Common Stock on the effective date of the fundamental change is less than $29.00. Any make-whole premium will be payable in shares of Common Stock (or the consideration into which the Company's Common Stock has been exchanged in the fundamental change) on the conversion date for the Convertible Notes converted in connection with the fundamental change.

The Convertible Notes were issued in an offering registered under the Securities Act of 1933, as amended (Securities Act).

In accordance with FASB guidance on the accounting for convertible debt instruments that may be settled in cash upon conversion (including partial settlement), the liability and equity components are separated in a manner that will reflect the entity's non-convertible debt borrowing rate when interest expense is recognized in subsequent periods.

The following represents the principal amount of the liability component, the unamortized discount, and the net carrying amount of our Convertible Notes as of March 31, 2012 and 2011, respectively:

	March 31,			March 31,
	2012			2011
Principal	$	172,500		$	172,500
Unamortized discount		(24,228	)		(30,663	)
Net carrying amount	$	148,272		$	141,837
Carrying amount of equity component	$	29,850		$	29,850

As of March 31, 2012, the remaining discount will be amortized over a period of 38 months. The conversion price of the $172,500 in aggregate principal amount of the Convertible Notes is $40.60 per share and the number of shares on which the aggregate consideration to be delivered upon conversion is 4,248,761.

The effective interest rate on the liability component of the Convertible Notes was 8.50%. The amount of interest cost recognized for the amortization of the discount on the liability component of the Convertible Notes was $6,435, $5,917 and $5,439, respectively, for the fiscal years ended March 31, 2012, 2011 and 2010.

As of March 31, 2012 and 2011, the Company had available and undrawn, under all its lines of credit, $377,230 and $356,447, respectively. Included in the March 31, 2012 and 2011 amounts are $95,340 and $95,049, respectively, of uncommitted lines of credit.

The Company paid $8,933, $16,101 and $16,456, net of interest received, for interest during the fiscal years ended March 31, 2012, 2011 and 2010, respectively.

Aggregate maturities of long-term debt (including $24,228 of Convertible Notes discount) are as follows at March 31, 2012:

2013	$	2,540
2014		2,450
2015		2,450
2016		254,350
2017		1,567
Thereafter
	$	263,357

The Company's financing agreements contain various covenants, which, absent prepayment in full of the indebtedness and other obligations, or the receipt of waivers, would limit the Company's ability to conduct certain specified business transactions including incurring debt, mergers, consolidations or similar transactions, buying or selling assets out of the ordinary course of business, engaging in sale and leaseback transactions, paying dividends and certain other actions. The Company is in compliance with all such covenants.

As of March 31, 2012 and 2011, the Company had $9,108 and $1,150, respectively, of standby letters of credit outstanding under the 2011 Credit Facility and other credit arrangements. As of March 31, 2012 and 2011, the Company had no bank guarantees.

Deferred Financing Fees

In fiscal 2011, in connection with the refinancing of the Company's previous credit facility, the Company wrote-off $2,308 of unamortized deferred financing fees associated with the previous Credit Facility, and incurred $3,500 in new deferred financing fees.

Deferred financing fees, net of accumulated amortization totaled $4,634 and $5,912 as of March 31, 2012 and 2011, respectively. Amortization expense, relating to deferred financing fees, included in interest expense was $1,278, $1,861, and $1,724 for the fiscal years ended March 31, 2012, 2011 and 2010, respectively.

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Property, Plant, And Equipment (Summary Of Property, Plant, And Equipment) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Property, Plant, And Equipment [Abstract]
Land, buildings, and improvements	$ 201,038	$ 174,887
Machinery and equipment	511,599	475,818
Construction in progress	29,779	51,662
Gross	742,416	702,367
Less accumulated depreciation	(389,201)	(357,982)
Total	$ 353,215	$ 344,385	$ 315,141

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Stock-Based Compensation (Summary Of Information Regarding Stock Options Outstanding And Exercisable) (Details) (USD $)	Mar. 31, 2012 Y
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Options	633,663
Options Outstanding, Weighted Average Remaining Contractual Life	6.1
Options Outstanding, Weighted Average Exercise Price	$ 20.85
Options Exercisable, Number of Options	523,626
Options Exercisable, Weighted Average Exercise Price	$ 21.82
$10.01-15.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Options	65,954
Options Outstanding, Weighted Average Remaining Contractual Life	3.1
Options Outstanding, Weighted Average Exercise Price	$ 14.12
Options Exercisable, Number of Options	65,954
Options Exercisable, Weighted Average Exercise Price	$ 14.12
$15.01-20.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Options	361,661
Options Outstanding, Weighted Average Remaining Contractual Life	6.6
Options Outstanding, Weighted Average Exercise Price	$ 16.75
Options Exercisable, Number of Options	251,624
Options Exercisable, Weighted Average Exercise Price	$ 16.99
Over $20.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Options	206,048
Options Outstanding, Weighted Average Remaining Contractual Life	6.1
Options Outstanding, Weighted Average Exercise Price	$ 30.19
Options Exercisable, Number of Options	206,048
Options Exercisable, Weighted Average Exercise Price	$ 30.19

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Prepaid And Other Current Assets

12 Months Ended

Mar. 31, 2012

Prepaid And Other Current Assets [Abstract]

Prepaid And Other Current Assets

6. Prepaid and Other Current Assets

Prepaid and other current assets consist of the following:

	March 31,
	2012		2011
Prepaid non income taxes	$	23,737	$	22,753
Non-trade receivables		8,247		8,214
Prepaid income taxes		7,716		15,986
Lead hedges		—		9,575
Other		12,693		13,675
Total	$	52,393	$	70,203

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Accrued Expenses

12 Months Ended

Mar. 31, 2012

Accrued Expenses [Abstract]

Accrued Expenses

7. Accrued Expenses

Accrued expenses consist of the following:

	March 31,
	2012		2011
Payroll and benefits	$	55,595	$	58,794
Accrued selling expenses		26,269		24,257
Warranty		19,274		16,218
Income taxes payable		16,979		15,591
VAT and other non-income taxes		10,966		11,937
Freight		12,314		10,208
Deferred income		12,057		7,107
Interest rate swaps		3,628		—
Interest		2,040		2,471
Pension and social security		1,696		1,854
Restructuring		1,186		5,323
Other		26,399		30,940
Total	$	188,403	$	184,700

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Leases

12 Months Ended

Mar. 31, 2012

Leases [Abstract]

Leases

9. Leases

The Company's future minimum lease payments under capital and operating leases that have noncancelable terms in excess of one year at March 31, 2012 are as follows:

	Capital Leases		Operating Leases
2013	$	451	$	18,268
2014		475		13,478
2015		84		10,108
2016		14		6,981
2017		7		5,008
Thereafter		—		3,588
Total minimum lease payments		1,031	$	57,431
Amounts representing interest		101
Net minimum lease payments, including current portion of $409	$	930

Rental expense was $31,619, $28,047, and $26,957 for the fiscal years ended March 31, 2012, 2011 and 2010, respectively. Amortization of capitalized leased assets is included in depreciation expense. Certain operating lease agreements contain renewal or purchase options and/or escalation clauses.

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Prepaid And Other Current Assets (Schedule Of Prepaid And Other Current Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
Prepaid And Other Current Assets [Abstract]
Prepaid non income taxes	$ 23,737	$ 22,753
Non-trade receivables	8,247	8,214
Prepaid income taxes	7,716	15,986
Lead hedges		9,575
Other	12,693	13,675
Total	$ 52,393	$ 70,203

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Other (Income) Expense, Net And Charges Related To Refinancing (Summary Of Other (Income) Expense, Net) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Other (Income) Expense, Net And Charges Related To Refinancing [Abstract]
Foreign exchange transaction losses	$ 1,483	$ 732	$ 3,045
Secondary offering fees		615	150
Other	1,585	830	1,189
Total	$ 3,068	$ 2,177	$ 4,384

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Income Taxes (Income Tax Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Income Taxes [Abstract]
Federal, Current	$ 30,459	$ 24,232	$ 9,000
State, Current	3,778	2,736	(981)
Foreign, Current	16,282	14,114	9,957
Total current	50,519	41,082	17,976
Federal, Deferred	(1,609)	(1,358)	4,678
State, Deferred	(962)	2,010	852
Foreign, Deferred	(656)	(3,716)	1,445
Total deferred	(3,227)	(3,064)	6,975
Income tax expense	$ 47,292	$ 38,018	$ 24,951

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Debt (2011 Senior Secured Revolving Credit Facility) (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 29, 2011
Debt Instrument [Line Items]
Senior secured revolving credit facility, initiation date	March 29, 2011
Liquidity test required to be met	February 2015
Capacity to meet potential obligations related to Convertible Notes	June 2015
Company owned capital stock percentage	65.00%
2011 Senior Secured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 350,000	$ 350,000
Maturity date	Mar. 31, 2016
Secured Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate of debt instrument	1.60%
Option One [Member] | 2011 Senior Secured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Interest on borrowings at a floating rate	LIBOR plus an applicable percentage (currently 1.25%)
Option Two [Member] | 2011 Senior Secured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Interest on borrowings at a floating rate	the greater of the Federal Funds rate plus 0.50% or the prime rate, or one-month LIBOR plus 1.0%, plus an applicable percentage (currently 0.25%)
LIBOR Rate [Member] | Option One [Member] | Applicable Percentage [Member]
Debt Instrument [Line Items]
Interest at a floating rate	1.25%
LIBOR Rate [Member] | Option Two [Member]
Debt Instrument [Line Items]
Interest at a floating rate	1.00%
LIBOR Rate [Member] | Option Two [Member] | Applicable Percentage [Member]
Debt Instrument [Line Items]
Interest at a floating rate	0.50%
Federal Funds Rate [Member] | Option Two [Member]
Debt Instrument [Line Items]
Interest at a floating rate	0.25%

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Retirement Plans (Summary Of Estimated Future Benefit Payments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012
Retirement Plans [Abstract]
2013	$ 2,173
2014	2,319
2015	2,445
2016	2,674
2017	2,993
Years 2018-2022	$ 17,281

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Goodwill And Other Intangible Assets (Schedule Of Changes In The Carrying Amount Of Goodwill By Business Segment) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Goodwill [Line Items]
Balance at beginning of year	$ 343,666	$ 317,265
Goodwill acquired during the year	10,723	15,301
Adjustments related to the finalization of purchase accounting for prior year acquisitions	379	2,274
Foreign currency translation	(7,707)	8,826
Balance at end of year	347,061	343,666
Europe [Member]
Goodwill [Line Items]
Balance at beginning of year	177,881	162,641
Goodwill acquired during the year	1,250	7,710
Adjustments related to the finalization of purchase accounting for prior year acquisitions	374	24
Foreign currency translation	(7,977)	7,506
Balance at end of year	171,528	177,881
Americas [Member]
Goodwill [Line Items]
Balance at beginning of year	143,225	132,915
Goodwill acquired during the year	7,973	7,591
Adjustments related to the finalization of purchase accounting for prior year acquisitions	5	2,250
Foreign currency translation	(449)	469
Balance at end of year	150,754	143,225
Asia [Member]
Goodwill [Line Items]
Balance at beginning of year	22,560	21,709
Goodwill acquired during the year	1,500
Foreign currency translation	719	851
Balance at end of year	$ 24,779	$ 22,560

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Retirement Plans (Summary Of Change In Projected Benefit Obligation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
United States Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at the beginning of the period	$ 11,903	$ 10,992
Service cost	285	250	224
Interest cost	668	646	635
Benefits paid, inclusive of plan expenses	(615)	(581)
Plan amendments		108
Experience (gain) loss	1,799	488
Benefit obligation at the end of the period	14,040	11,903	10,992
International Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at the beginning of the period	48,881	46,851
Service cost	645	603	621
Interest cost	2,504	2,503	2,520
Benefits paid, inclusive of plan expenses	(1,709)	(1,481)
Plan settlements	(40)
Plan amendments		817
Plan combinations (including newly material plans)		337
Experience (gain) loss	5,442	(3,366)
Foreign currency translation adjustment	(1,828)	2,617
Benefit obligation at the end of the period	$ 53,895	$ 48,881	$ 46,851

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Summary Of Significant Accounting Policies (Policy)

12 Months Ended

Mar. 31, 2012

Summary Of Significant Accounting Policies [Abstract]

Description Of Business

Description of Business

EnerSys and its predecessor companies have been manufacturers of industrial batteries for over 100 years. EnerSys is a global leader in stored energy solutions for industrial applications. The Company manufactures, markets and distributes industrial batteries and related products such as chargers, power equipment and battery accessories, and provides related after-market and customer-support services for industrial batteries.

Principles Of Consolidation

Principles of Consolidation

The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries and any partially-owned subsidiaries that the Company has the ability to control. Control generally equates to ownership percentage, whereby investments that are more than 50% owned are generally consolidated, investments in affiliates of 50% or less but greater than 20% are generally accounted for using the equity method, and investments in affiliates of 20% or less are accounted for using the cost method. All intercompany transactions and balances have been eliminated in consolidation.

Foreign Currency Translation

Foreign Currency Translation

Results of foreign operations are translated into U.S. dollars using average exchange rates during the period. The assets and liabilities are translated into U.S. dollars using exchange rates as of the balance sheet date. Gains or losses resulting from translating the foreign currency financial statements are accumulated as a separate component of accumulated other comprehensive income ("AOCI") in EnerSys' stockholders' equity and noncontrolling interests.

Transaction gains and losses resulting from exchange rate changes on transactions denominated in currencies other than the functional currency of the applicable subsidiary are included in the Consolidated Statements of Income, within "Other (income) expense, net", in the year in which the change occurs.

Revenue Recognition

Revenue Recognition

The Company recognizes revenue when the earnings process is complete. This occurs when risk and title transfers, collectibility is reasonably assured and pricing is fixed and determinable. Shipment terms are either shipping point or destination and do not differ significantly between the Company's business segments. Accordingly, revenue is recognized when risk and title are transferred to the customer. Amounts invoiced to customers for shipping and handling are classified as revenue. Taxes on revenue producing transactions are not included in net sales.

The Company recognizes revenue from the service of its reserve power and motive power products when the respective services are performed.

Accruals are made at the time of sale for sales returns and other allowances based on the Company's historical experience.

Freight Expense

Freight Expense

Amounts billed to customers for outbound freight costs are classified as sales in the consolidated statements of income. Costs incurred by the Company for outbound freight costs to customers, inbound and transfer freight are classified in cost of goods sold.

Warranties

Warranties

The Company's products are warranted for a period ranging from one to twenty years for reserve power batteries and for a period ranging from one to seven years for motive power batteries. The Company provides for estimated product warranty expenses when the related products are sold. The assessment of the adequacy of the reserve includes a review of open claims and historical experience.

Cash And Cash Equivalents

Cash and Cash Equivalents

Cash and cash equivalents include all highly liquid investments with an original maturity of three months or less when purchased.

Concentration Of Credit Risk

Concentration of Credit Risk

Financial instruments that subject the Company to potential concentration of credit risk consist principally of short-term cash investments and trade accounts receivable. The Company invests its cash with various financial institutions and in various investment instruments limiting the amount of credit exposure to any one financial institution or entity. The Company has bank deposits that exceed federally-insured limits. In addition, certain cash investments may be made in U.S. and foreign government bonds, or other highly rated investments guaranteed by the U.S. or foreign governments. Concentration of credit risk with respect to trade receivables is limited by a large, diversified customer base and its geographic dispersion. The Company performs ongoing credit evaluations of its customers' financial condition and requires collateral, such as letters of credit, in certain circumstances.

Accounts Receivable

Accounts Receivable

The Company maintains allowances for doubtful accounts for estimated losses resulting from the inability of customers to make required payments. The allowance is based on management's estimate of uncollectible accounts, analysis of historical data and trends, as well as reviews of all relevant factors concerning the financial capability of its customers. Accounts receivable are considered to be past due based on how payments are received compared to the customer's credit terms. Accounts are written off when management determines the account is uncollectible.

Inventories

Inventories

Inventories are stated at the lower of cost or market. Cost is determined using the first-in, first-out (FIFO) method. The cost of inventory consists of material, labor, and associated overhead.

Property, Plant, And Equipment

Property, Plant, and Equipment

Property, plant, and equipment are recorded at cost and include expenditures that substantially increase the useful lives of the assets. Depreciation is provided using the straight-line method over the estimated useful lives of the assets as follows: 10 to 33 years for buildings and improvements and 3 to 15 years for machinery and equipment.

Maintenance and repairs are expensed as incurred. Interest on capital projects is capitalized during the construction period.

Goodwill And Other Intangible Assets

Goodwill and Other Intangible Assets

         The Company records the excess of purchase price over the fair value of the tangible and identifiable intangible assets acquired as goodwill. Goodwill and indefinite-lived trade names are tested for impairment at least annually and whenever events or circumstances occur indicating that a possible impairment may have been incurred. The Company utilizes financial projections of its business segments, certain cash flow measures, as well as its market capitalization in its determination of the fair value of these assets.

Finite-lived assets such as purchased and licensed technology, patents and customer lists are amortized over their estimated useful lives, generally over periods ranging from 3 to 20 years. The Company reviews the carrying values of these assets for possible impairment whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable based on undiscounted estimated cash flows expected to result from its use and eventual disposition. The Company continually evaluates the reasonableness of the useful lives of these assets.

Impairment Of Long-Lived Assets

Impairment of Long-Lived Assets

The Company reviews the carrying values of its property and equipment for possible impairment whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable based on undiscounted estimated cash flows expected to result from its use and eventual disposition. The factors considered by the Company in performing this assessment include current operating results, trends and other economic factors. In assessing the recoverability of the carrying value of the property and equipment, the Company must make assumptions regarding future cash flows and other factors. If these estimates or the related assumptions change in the future, the Company may be required to record an impairment loss for these assets.

Environmental Expenditures

Environmental Expenditures

The Company records a loss and establishes a reserve for environmental remediation liabilities when it is probable that an asset has been impaired or a liability exists and the amount of the liability can be reasonably estimated. Reasonable estimates involve judgments made by management after considering a broad range of information including: notifications, demands or settlements that have been received from a regulatory authority or private party, estimates performed by independent engineering companies and outside counsel, available facts existing and proposed technology, the identification of other potentially responsible parties, their ability to contribute and prior experience. These judgments are reviewed quarterly as more information is received and the amounts reserved are updated as necessary. However, the reserves may materially differ from ultimate actual liabilities if the loss contingency is difficult to estimate or if management's judgments turn out to be inaccurate. If management believes no best estimate exists, the minimum probable loss is accrued.

Fair Value Of Financial Instruments

Fair Value of Financial Instruments

The fair value of the Company's cash and cash equivalents, accounts receivable and accounts payable approximate carrying value due to their short maturities.

The fair value of the Company's $350,000 senior secured revolving credit facility ("2011 Credit Facility"), the 75,000 Chinese Renminbi ("RMB") credit facility ("China Term Loan"), the 273,780 Indian Rupee ("INR") term loan ("India Term Loan") and short-term debt approximate their carrying value, as they are variable rate debt and the current terms are comparable to market terms as of the balance sheet dates and are classified as Level 2.

The fair value amounts of the Company's $172,500 senior unsecured 3.375% convertible notes ("Convertible Notes") represent the trading values of the Convertible Notes which is based upon quoted market prices and are classified as Level 2.

Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (an exit price). The Company and its subsidiaries use, as appropriate, a market approach (generally, data from market transactions), an income approach (generally, present value techniques and option-pricing models), and/or a cost approach (generally, replacement cost) to measure the fair value of an asset or liability. These valuation approaches incorporate inputs such as observable, independent market data and/or unobservable data that management believes are predicated on the assumptions market participants would use to price an asset or liability. These inputs may incorporate, as applicable, certain risks such as nonperformance risk, which includes credit risk.

Lead contracts, foreign currency contracts and interest rate contracts generally use an income approach to measure the fair value of these contracts, utilizing readily observable inputs, such as forward interest rates (e.g., London Interbank Offered Rate—"LIBOR") and forward foreign currency exchange rates (e.g., GBP and euro) and commodity prices (e.g. London Metals Exchange), as well as inputs that may not be observable, such as credit valuation adjustments. When observable inputs are used to measure all or most of the value of a contract, the contract is classified as Level 2. Over-the-counter (OTC) contracts are valued using quotes obtained from an exchange, binding and non-binding broker quotes. Furthermore, the Company obtains independent quotes from the market to validate the forward price curves. OTC contracts include forwards, swaps and options. To the extent possible, fair value measurements utilize various inputs that include quoted prices for similar contracts or market-corroborated inputs.

When unobservable inputs are significant to the fair value measurement, a contract is classified as Level 3. The Company did not have any Level 3 positions at March 31, 2012 or March 31, 2011. Additionally, Level 2 fair value measurements include adjustments for credit risk based on the Company's own creditworthiness (for net liabilities) and its counterparties' creditworthiness (for net assets). The Company assumes that observable market prices include sufficient adjustments for liquidity and modeling risks. The Company did not have any contracts that transferred between Level 2 and Level 3 as well as Level 1 and Level 2.

Derivative Financial Instruments

 Derivative Financial Instruments

           The Company utilizes derivative instruments to mitigate volatility related to interest rates, lead prices and foreign currency exposures. The Company does not hold or issue derivative financial instruments for trading or speculative purposes. The Company recognizes derivatives as either assets or liabilities in the accompanying balance sheet and measures those instruments at fair value. Changes in the fair value of those instruments are reported in AOCI if they qualify for hedge accounting or in earnings if they do not qualify for hedge accounting. Derivatives qualify for hedge accounting if they are designated as hedge instruments and if the hedge is highly effective in achieving offsetting changes in the fair value or cash flows of the asset or liability hedged. Effectiveness is measured on a regular basis using statistical analysis and by comparing the overall changes in the expected cash flows on the lead and foreign currency forward contracts with the changes in the expected all-in cash outflow required for the lead and foreign currency purchases. This analysis is performed on the initial purchases quarterly that cover the quantities hedged. Accordingly, gains and losses from changes in derivative fair value of effective hedges are deferred and reported in AOCI until the underlying transaction affects earnings.

The Company has commodity, foreign exchange and interest rate hedging authorization from the Board of Directors and has established a hedging and risk management program that includes the management of market and counterparty risk. Key risk control activities designed to ensure compliance with the risk management program include, but are not limited to, credit review and approval, validation of transactions and market prices, verification of risk and transaction limits, portfolio stress tests, sensitivity analyses and frequent portfolio reporting, including open positions, determinations of fair value and other risk management metrics.

Market risk is the potential loss the Company and its subsidiaries may incur as a result of price changes associated with a particular financial or commodity instrument. The Company utilizes forward contracts, and swaps as part of its risk management strategies, to minimize unanticipated fluctuations in earnings caused by changes in commodity prices, interest rates and/or foreign currency exchange rates. All derivatives are recognized on the balance sheet at their fair value, unless they qualify for Normal Purchase Normal Sale.

Credit risk is the potential loss the Company may incur due to counterparty's non-performance. The Company is exposed to credit risk from interest rate, foreign currency and commodity derivatives with financial institutions. The Company has credit policies to manage their credit risk, including the use of an established credit approval process, monitoring of counterparty positions and the use of master netting agreements.

The Company has elected to offset net derivative positions under master netting arrangements. The Company does not have any positions involving cash collateral (payables or receivables) under a master netting arrangement as of March 31, 2012 and 2011.

The Company does not have any credit-related contingent features associated with their derivative instruments.

Income Taxes

Income Taxes

The Company accounts for income taxes in accordance with the Financial Accounting Standards Board ("FASB") guidance, which requires deferred tax assets and liabilities be recognized using enacted tax rates to measure the effect of temporary differences between book and tax bases on recorded assets and liabilities. FASB guidance also requires that deferred tax assets be reduced by a valuation allowance, if it is more likely than not some portion or all of the deferred tax assets will not be recognized.

The Company evaluates on a quarterly basis its ability to realize deferred tax assets by assessing its valuation allowance and by adjusting the amount of such allowance, if necessary. The factors used to assess the likelihood of realization are forecasts of future taxable income and available tax planning strategies that could be implemented to realize the net deferred tax assets.

In accordance with FASB guidance on accounting for uncertainty in income taxes, the Company evaluates tax positions to determine whether the benefits of tax positions are more likely than not of being sustained upon audit based on the technical merits of the tax position. For tax positions that are more likely than not of being sustained upon audit, the Company recognizes the largest amount of the benefit that is greater than 50% likely of being realized upon ultimate settlement. For tax positions that are not more likely than not of being sustained upon audit, the Company does not recognize any portion of the benefit. If the more likely than not threshold is not met in the period for which a tax position is taken, the Company may subsequently recognize the benefit of that tax position if the tax matter is effectively settled, the statute of limitations expires, or if the more likely than not threshold is met in a subsequent period.

Deferred Financing Fees

Deferred Financing Fees

Debt issuance costs that are incurred by the Company in connection with the issuance of debt are deferred and amortized to interest expense over the life of the underlying indebtedness, adjusted to reflect any early repayments.

Retirement Plans

 Retirement Plans

The Company accounts for retirement plans in accordance with FASB guidance on employers' accounting for defined benefit pension benefit plans, which requires an entity to recognize in its statement of financial position an asset for a defined benefit postretirement plan's overfunded status or a liability for a plan's underfunded status, and to measure a defined benefit postretirement plan's assets and obligation that determine its funded status as of the end of the balance sheet date.

The Company uses certain assumptions in the calculation of the actuarial valuations of its defined benefit plans. These assumptions include discount rate, rates of increase in compensation levels and expected long-term rates of return of plan assets. If actual results are less favorable than those projected by the Company, additional expense may be required.

Stock-Based Compensation Plans

Stock-Based Compensation Plans

The Company accounts for stock compensation in accordance with FASB guidance, which requires the Company to measure the cost of employee services received in exchange for the award of an equity instrument based on the grant-date fair value of the award, with such cost recognized over the applicable vesting period. In addition, the guidance requires an entity to provide certain disclosures in order to assist in understanding the nature of share-based payment transactions and the effects of those transactions on the financial statements.

Market Share Units

The fair value of the market share units is estimated at the date of grant using a binomial lattice model with the following assumptions: a risk-free interest rate, dividend yield, time to maturity and expected volatility. These units vest and are settled in common stock on the third anniversary of the date of grant. Market share units are converted into between zero and two shares of common stock for each unit granted at the end of a three-year performance cycle. The conversion ratio is calculated by dividing the average closing share price of the Company's common stock during the ninety calendar days immediately preceding the vesting date by the average closing share price of the Company's common stock during the ninety calendar days immediately preceding the grant date, with the resulting quotient capped at two. This quotient is then multiplied by the number of market share units granted to yield the number of shares of common stock to be delivered on the vesting date. The Company recognizes compensation expense using the straight-line method over the life of the market share units.

Restricted Stock Units

The fair value of restricted stock units is based on the closing market price of the Company's common stock on the date of grant. These awards generally vest, and are settled in common stock, at 25% per year, over a four-year period from the date of grant. The Company recognizes compensation expense using the straight-line method over the life of the restricted stock units.

Stock Options

The fair value of the options granted is estimated at the date of grant using the Black-Scholes option-pricing model utilizing assumptions based on historical data and current market data. The assumptions include expected term of the options, risk-free interest rate, expected volatility, and dividend yield. The expected term represents the expected amount of time that options granted are expected to be outstanding, based on historical and forecasted exercise behavior. The risk-free rate is based on the rate at grant date of zero-coupon U.S. Treasury Notes with a term equal to the expected term of the option. Expected volatility is estimated using historical volatility rates based on historical weekly price changes. The Company's dividend yield is based on historical data. The Company recognizes compensation expense using the straight-line method over the vesting period of the options.

Earnings Per Share

Earnings Per Share

Basic earnings per common share ("EPS") are computed by dividing net earnings available to common stockholders by the weighted average number of common shares outstanding for the period. Diluted EPS reflects the potential dilution that would occur if securities or other contracts to issue common stock were exercised or converted into common stock. At March 31, 2012, 2011 and 2010, the Company had outstanding stock options, restricted stock units, market share units and Convertible Notes, which could potentially dilute basic earnings per share in the future.

Segment Reporting

Segment Reporting

FASB guidance defines that a segment for reporting purposes is based on the financial performance measures that are regularly reviewed by the chief operating decision maker to assess segment performance and to make decisions about a public entity's allocation of resources. Based on this guidance, the Company reports its segment results based upon the three geographical regions of operations—Americas, Europe and Asia.

Use Of Estimates

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.

Reclassifications

Reclassifications

Certain amounts in the prior years' financial statements have been reclassified to conform to the current-year presentation.

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Warranty (Tables)

12 Months Ended

Mar. 31, 2012

Warranty [Abstract]

Analysis Of Changes In Liability For Product Warranties

Balance at March 31, 2009	$	30,914
Current year provisions		13,123
Costs incurred		(13,283	)
Foreign exchange and other		985
Balance at March 31, 2010	$	31,739
Current year provisions		20,565
Costs incurred		(17,499	)
Foreign exchange and other		1,201
Balance at March 31, 2011	$	36,006
Current year provisions		26,841
Costs incurred		(20,185	)
Foreign exchange and other		(595	)
Balance at March 31, 2012	$	42,067

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Retirement Plans

12 Months Ended

Mar. 31, 2012

Retirement Plans [Abstract]

Retirement Plans

14. Retirement Plans

Defined Benefit Plans

The Company provides retirement benefits to substantially all eligible salaried and hourly employees. The Company uses a measurement date of March 31 for its pension plans.

Net periodic pension cost for fiscal 2012, 2011, and 2010, includes the following components:

	United States Plans									International Plans
	Fiscal Year Ended March 31,									Fiscal Year Ended March 31,
	2012			2011			2010			2012			2011			2010
Service cost	$	285		$	250		$	224		$	645		$	603		$	621
Interest cost		668			646			635			2,504			2,503			2,520
Expected return on plan assets		(706	)		(624	)		(491	)		(1,787	)		(1,615	)		(1,256	)
Amortization and deferral		238			248			458			32			53			(43	)
Net periodic benefit cost	$	485		$	520		$	826		$	1,394		$	1,544		$	1,842

The following table sets forth a reconciliation of the related benefit obligation, plan assets, and accrued benefit costs related to the pension benefits provided by the Company for those employees covered by defined benefit plans:

	United States Plans						International Plans
	March 31,						March 31,
	2012			2011			2012			2011
Change in projected benefit obligation
Benefit obligation at the beginning of the period	$	11,903		$	10,992		$	48,881		$	46,851
Service cost		285			250			645			603
Interest cost		668			646			2,504			2,503
Benefits paid, inclusive of plan expenses		(615	)		(581	)		(1,709	)		(1,481	)
Plan settlements		—			—			(40	)		—
Plan amendments		—			108			—			817
Plan combinations (including newly material plans)		—			—			—			337
Experience (gain) loss		1,799			488			5,442			(3,366	)
Foreign currency translation adjustment		—			—			(1,828	)		2,617
Benefit obligation at the end of the period	$	14,040		$	11,903		$	53,895		$	48,881

	United States Plans						International Plans
	March 31,						March 31,
	2012			2011			2012			2011
Change in plan assets
Fair value of plan assets at the beginning of the period	$	8,746		$	7,859		$	25,779		$	22,712
Actual return on plan assets		420			1,102			1,555			1,751
Employer contributions		641			366			1,505			1,424
Benefits paid, inclusive of plan expenses		(615	)		(581	)		(1,709	)		(1,481	)
Plan settlements		—			—			(40	)		—
Foreign currency translation adjustments		—			—			(148	)		1,373
Fair value of plan assets at the end of the period	$	9,192		$	8,746		$	26,942		$	25,779
Funded status deficit	$	(4,848	)	$	(3,157	)	$	(26,953	)	$	(23,102	)

	March 31,
	2012			2011
Amounts recognized in the consolidated balance sheets consist of:
Other assets	$	260		$	2,513
Accrued expenses		(1,309	)		(1,369	)
Other liabilities		(30,752	)		(27,403	)
	$	(31,801	)	$	(26,259	)

The following table represents pension components (before tax) and related changes (net of tax) recognized in AOCI for the Company's pension plans for the years ended March 31, 2012, 2011 and 2010:

	March 31,
	2012			2011			2010
Amounts recorded in AOCI before taxes:
Prior service credit (cost)	$	(922	)	$	(1,054	)	$	(132	)
Net gain (loss)		(11,176	)		(3,712	)		(7,344	)
Net amount recognized	$	(12,098	)	$	(4,766	)	$	(7,476	)

	March 31,
	2012			2011			2010
Changes in plan assets and benefit obligations:
New prior service cost	$	—		$	905		$	—
Net loss /(gain) arising during the year		7,757			(3,505	)		753
Effect of exchange rates on amounts included in AOCI		(176	)		151			40
Amounts recognized as a component of net periodic benefit costs:
Amortization or curtailment recognition of prior service credit /(cost)		(83	)		(62	)		(142	)
Amortization or settlement recognition of net gain/(loss)		(187	)		(250	)		(333	)
Total recognized in other comprehensive income	$	7,311		$	(2,761	)	$	318

The amounts included in AOCI as of March 31, 2012 that are expected to be recognized as components of net periodic pension cost during the fiscal year ended March 31, 2013 are as follows:

Net loss	$	(81	)
Net prior service cost		(534	)
Net amount expected to be recognized	$	(615	)

The accumulated benefit obligation related to all defined benefit pension plans and information related to unfunded and underfunded defined benefit pension plans at the end of each year follows:

	United States Plans				International Plans
	March 31,				March 31,
	2012		2011		2012		2011
All defined benefit plans:
Accumulated benefit obligation	$	14,040	$	11,903	$	50,416	$	46,225
Unfunded defined benefit plans:
Projected benefit obligation		—		—		26,892		25,533
Accumulated benefit obligation		—		—		25,508		24,413
Defined benefit plans with an accumulated benefit obligation in excess of the fair value of plan assets:
Projected benefit obligation		14,040		11,903		28,003		25,560
Accumulated benefit obligation		14,040		11,903		26,445		24,440
Fair value of plan assets		9,192		8,746		789		—

Assumptions

Significant assumptions used to determine the net periodic benefit cost for the US and International plans were as follows:

	United States Plans									International Plans
	March 31,									March 31,
	2012			2011			2010			2012			2011			2010
Discount rate		5.7	%		6.0	%		6.5	%		4.0-5.5	%		4.3-6.0	%		3.8-6.0	%
Expected return on plan assets		8.0			8.0			8.0			5.5-7.0			5.5-7.0			5.5-7.0
Rate of compensation increase		N/A			N/A			N/A			2.0-4.0			2.0-3.5			2.0-3.5

Significant assumptions used to determine the projected benefit obligations for the US and International plans were as follows:

	United States Plans						International Plans
	March 31,						March 31,
	2012			2011			2012			2011
Discount rate		4.8	%		5.7	%		2.5-5.5	%		4.0-5.5	%
Expected return on plan assets		8.0			8.0			5.5-7.0			5.5-7.0
Rate of compensation increase		N/A			N/A			2.0-4.0			2.0-4.0

N/A = not applicable

The United States plans do not include compensation in the formula for determining the pension benefit as it is based solely on years of service.

The expected long-term rate of return for the Company's pension plan assets is based upon the target asset allocation and is determined using forward looking assumptions in the context of historical returns and volatilities for each asset class, as well as correlations among asset classes. The Company evaluates the rate of return assumptions for each of its plans on an annual basis.

Pension Plan Investment Strategy

The Company's investment policy emphasizes a balanced approach to investing in securities of high quality and ready marketability. Investment flexibility is encouraged so as not to exclude opportunities available through a diversified investment strategy.

Equity investments are maintained within a target range of 50%-70% of the total portfolio market value. Investments in debt securities include issues of various maturities, and the average quality rating of bonds should be investment grade with a minimum quality rating of "B" at the time of purchase.

The Company periodically reviews the asset allocation of its portfolio. The proportion committed to equities, debt securities and cash and cash equivalents is a function of the values available in each category and risk considerations. The plan's overall return will be compared to and expected to meet or exceed established benchmark funds and returns over a three to five year period.

The objectives of the Company's investment strategies are: (a) the achievement of a reasonable long-term rate of total return consistent with an emphasis on preservation of capital and purchasing power, (b) stability of annual returns through a portfolio risk level, which is appropriate to conservative accounts, and (c) reflective of the Company's willingness to forgo significantly above-average rewards in order to minimize above-average risks. These objectives may not be met each year but should be attained over a reasonable period of time.

In connection with a past acquisition, the Company had assumed defined benefit plans in Germany and France. These plans have no assets, while their benefit obligations were $22,874 and $21,706 as of March 31, 2012 and 2011, respectively. Other salary and hourly employees are provided benefits in accordance with governmental regulatory requirements.

The following table represents our pension plan investments measured at fair value as of March 31, 2012 and 2011 and the basis for that measurement:

	March 31, 2012
	United States Plans								International Plans
	Total Fair Value Measurement		Quoted Price In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Fair Value Measurement		Quoted Price In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Asset Category:
Cash and Cash Equivalents	$	868	$	868	$	—	$	—	$	—	$	—	$	—	$	—
Equity Securities
US(a)		5,067		5,067		—		—		2,742		2,742		—		—
International(b)		837		837		—		—		14,728		14,728		—		—
Fixed Income(c)		2,420		2,420		—		—		9,472		9,472		—		—
Total	$	9,192	$	9,192	$	—	$	—	$	26,942	$	26,942	$	—	$	—

	March 31, 2011
	United States Plans								International Plans
	Total Fair Value Measurement		Quoted Price In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Fair Value Measurement		Quoted Price In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Asset Category:
Cash and Cash Equivalents	$	528	$	528	$	—	$	—	$	—	$	—	$	—	$	—
Equity Securities
US(a)		4,839		4,839		—		—		2,521		2,521		—		—
International(b)		840		840		—		—		13,600		13,600		—		—
Fixed Income(c)		2,539		2,539		—		—		9,658		9,658		—		—
Total	$	8,746	$	8,746	$	—	$	—	$	25,779	$	25,779	$	—	$	—

The fair values presented above were determined based on valuation techniques categorized as follows:

• Level one: The use of unadjusted quoted prices in active markets for identical instruments.

• Level two: The use of quoted prices for similar instruments in active markets or quoted prices for identical or similar instruments in markets that are not active or other inputs that are observable in the market or can be corroborated by observable market data.

• Level three: The use of significant unobservable inputs and that typically require the use of management's estimates of assumptions that market participants would use in pricing.

(a) US equities include companies that are well diversified by industry sector and equity style (i.e., growth and value strategies). Active and passive management strategies are employed. Investments are primarily in large capitalization stocks and, to a lesser extent, mid- and small-cap stocks.

(b) International equities are invested in companies that are traded on exchanges outside the U.S. and are well diversified by industry sector, country and equity style. Active and passive strategies are employed. The vast majority of the investments are made in companies in developed markets with a small percentage in emerging markets.

(c) Fixed income consists primarily of investment grade bonds from diversified industries.

The Company expects to make cash contributions of approximately $2,571 to its pension plans in fiscal year 2013.

Estimated future benefit payments under the Company's pension plans are as follows:

	Pension Benefits
2013	$	2,173
2014		2,319
2015		2,445
2016		2,674
2017		2,993
Years 2018-2022		17,281

Defined Contribution Plan

Effective January 1, 2004, the Company amended its Defined Contribution Plan (the "401(k) Plan"). The amended 401(k) Plan covers substantially all U.S. salaried and hourly employees except those covered by a union plan. All eligible employees of the amended 401(k) Plan receive a matching contribution of 100% of the first 4% of wages contributed and 50% of the next 2% of wages contributed for a total match of up to 5% by the Company.

Effective February 1, 2009, the Company amended the EnerSys United Kingdom Pension Scheme ("Amended U.K. Plan") that covers substantially all United Kingdom employees, both direct and salaried so that all members with defined benefit plan benefits at that date would be provided with defined contribution plan benefits for future service. The Company pays contributions to fund any accrued liabilities in excess of the assets in the defined benefit section of the Amended U.K. Plan as necessary. Active members of the Amended U.K. Plan as of February 1, 2009 receive a matching contribution from the Company up to 4% of Pensionable Salary and an enhanced Company contribution in excess of this in line with the rules of the plan. New eligible employees of the Amended U.K. Plan receive a matching contribution from the Company up to 5% of pensionable salary, at various rates as provided by the plan.

Employer expenses for the 401(k) plan and the Amended U.K. Plan for the fiscal years ended March 31, 2012, 2011 and 2010 were $5,146, $5,025 and $3,909, respectively.

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Commitments, Contingencies And Litigation (Details) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended										12 Months Ended
	Oct. 02, 2011 USD ($)	Oct. 02, 2011 EUR (€)	Mar. 31, 2012 USD ($)	Mar. 31, 2011 USD ($)	Mar. 31, 2009 USD ($)	Mar. 31, 2009 EUR (€)	Mar. 31, 2012 Lead Hedge Forward Contracts [Member] USD ($) lb	Mar. 31, 2011 Lead Hedge Forward Contracts [Member] USD ($) lb	Mar. 31, 2012 Foreign Currency Forward Contracts [Member] USD ($)	Mar. 31, 2011 Foreign Currency Forward Contracts [Member] USD ($)	Mar. 31, 2012 Interest Rate Swap Agreements [Member] USD ($)	Mar. 31, 2011 Interest Rate Swap Agreements [Member] USD ($)	Mar. 31, 2012 Maximum [Member]	Mar. 31, 2012 Minimum [Member]
Commitments, Contingencies And Litigation [Line Items]
Litigation damages assessed and paid					$ 4,200	€ 2,700
Refund from damages paid	900	671
Average term of collective bargaining agreements			2 years
Longest term of collective bargaining agreements			4 years
Percentage of employees covered by collective bargaining agreements			40.00%
Expiration year of collective bargaining agreements													2014	2012
Company number of employees			9,200
Reserves of environmental liabilities			2,995	3,279
Purchase price of hedges, pounds of lead							60,000,000	63,400,000
Purchase price of hedges							56,610	68,212	53,531	82,829
Convertible interest rate swap											$ 85,000	$ 85,000

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Commitments, Contingencies And Litigation

12 Months Ended

Mar. 31, 2012

Commitments, Contingencies And Litigation [Abstract]

Commitments, Contingencies And Litigation

19. Commitments, Contingencies and Litigation

Litigation and Other Legal Matters

The Company is involved in litigation incidental to the conduct of its business, the results of which, in the opinion of management, are not likely to be material to the Company's financial condition, results of operations, or cash flows.

In fiscal 2009, the Court of Commerce in Lyon, France ruled that the Company's French subsidiary, EnerSys Sarl, which was acquired by the Company in 2002, was partially responsible for a 1999 fire in a French hotel under construction. The Company's portion of damages was assessed at €2,700 or $4,200 which was duly recorded and paid by the Company, but the ruling was appealed. In a subsequent ruling by the Court of Appeal of Lyon, France, the portion of damages was reduced, entitling the Company to a refund of the monies paid of €671 or $900 which has been recorded and collected in the second quarter of fiscal 2012. The Company further appealed the ruling to the French Supreme Court, which on March 14, 2012, ruled in the Company's favor and ordered the case back to the Court of Appeal of Lyon to further review certain aspects of the original decision in the case, including the assessment of damages.

Environmental Issues

As a result of its operations, the Company is subject to various federal, state and local, as well as international environmental laws and regulations and is exposed to the costs and risks of registering, handling, processing, storing, transporting, and disposing of hazardous substances, especially lead and acid. The Company's operations are also subject to federal, state, local and international occupational safety and health regulations, including laws and regulations relating to exposure to lead in the workplace.

The Company is responsible for certain cleanup obligations at the former Yuasa battery facility in Sumter, South Carolina that predates its ownership of this facility. This manufacturing facility was closed in 2001 and is separate from the Company's current metal fabrication facility in Sumter. The Company has established a reserve for this facility. As of March 31, 2012 and 2011, the reserves related to this facility totaled $2,995 and $3,279, respectively. Based on current information, the Company's management believes these reserves are adequate to satisfy the Company's environmental liabilities at this facility.

In September 2011, the Company's facility in Jiangsu Province, China, was closed by government authorities for an environmental review. After completion of the review, the government authorities allowed the plant to reopen in November 2011 on a conditional basis, with the understanding that the Company would work with the assistance of the government agencies, to relocate to a more preferable location.

Collective Bargaining

          At March 31, 2012, the Company had approximately 9,200 employees. Of these employees, approximately 40% were covered by collective bargaining agreements. The average term of these agreements is two years, with the longest term being four years. These agreements expire over the period from calendar years 2012 to 2014.

Lead Contracts

To stabilize its costs, the Company has entered into contracts with financial institutions to fix the price of lead. The vast majority of such contracts are for a period not extending beyond one year. Under these contracts, at March 31, 2012 and 2011, the Company hedged the price to purchase approximately 60.0 million and 63.4 million pounds of lead, respectively, for a total purchase price of $56,610 and $68,212, respectively.

Foreign Currency Forward Contracts

         The Company quantifies and monitors its global foreign currency exposures. On a selective basis the Company will enter into foreign currency forward and option contracts to reduce the volatility from currency movements that affect the Company. The maturity period of these contracts is less than one year. The Company's largest exposure is from the purchase and conversion of U.S. dollar based lead costs into local currencies in Europe. Additionally, the Company has currency exposures from intercompany and third party trade transactions. To hedge these exposures, the Company has entered into a total of $53,531 and $82,829, respectively, of foreign currency forward contracts with financial institutions as of March 31, 2012 and 2011.

Interest Rate Swap Agreements

         The Company is exposed to changes in variable U.S. interest rates on borrowings under its credit agreements. On a selective basis, from time to time, the Company enters into interest rate swap agreements to reduce the negative impact that increases in interest rates could have on its outstanding variable rate debt. At March 31, 2012 and March 31, 2011, such agreements, which expire between February 2013 and May 2013, converted $85,000 of variable-rate debt to a fixed-rate basis, utilizing the three-month LIBOR, as a floating rate reference. Fluctuations in LIBOR and fixed rates affect both the Company's net financial investment position and the amount of cash to be paid or received under these agreements.

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Retirement Plans (Summary Of Amounts Recorded In AOCI Before Taxes) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Retirement Plans [Abstract]
Prior service credit (cost)	$ (922)	$ (1,054)	$ (132)
Net gain (loss)	(11,176)	(3,712)	(7,344)
Net amount recognized	$ (12,098)	$ (4,766)	$ (7,476)

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Earnings Per Share (Tables)

12 Months Ended

Mar. 31, 2012

Earnings Per Share [Abstract]

Reconciliation From Basic To Diluted Average Common Shares And Net Earnings Per Common Share

	March 31,
	2012		2011		2010
Net earnings attributable to EnerSys stockholders	$	144,003	$	113,426	$	62,304
Average common shares:
Basic (weighted-average outstanding shares)		48,748,205		49,376,132		48,122,207
Dilutive potential common shares from exercise and lapse of equity awards, net of shares assumed reacquired		467,830		668,114		711,888
Diluted (weighted-average outstanding shares)		49,216,035		50,044,246		48,834,095
Basic earnings per common share attributable to EnerSys stockholders	$	2.95	$	2.30	$	1.29
Diluted earnings per common share attributable to EnerSys stockholders	$	2.93	$	2.27	$	1.28
Anti-dilutive equity awards not included in weighted average common shares — diluted		221,097		—		383,696

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Stockholders' Equity (Components Of Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Stockholders' Equity [Abstract]
Pension funded status adjustment, Beginning Balance	$ (3,512)	$ (5,479)	$ (4,794)
Unrealized gain (loss) on derivative instruments, Beginning Balance	4,436	(5,034)	(7,660)
Foreign currency translation adjustment, Beginning Balance	114,256	77,717	46,509
Accumulated other comprehensive income, Beginning Balance	115,180	67,204	34,055
Pension funded status adjustment, Before-Tax Amount	(7,311)	2,761	(318)
Unrealized gain (loss) on derivative instruments, Before-Tax Amount	(5,170)	14,721	4,047
Foreign currency translation adjustment, Before-Tax Amount	(32,356)	36,539	31,208
Accumulated other comprehensive income, Before-Tax Amount	(44,837)	54,021	34,937
Pension funded status adjustment, Tax Benefit (Expense)	1,841	(794)	(367)
Unrealized gain (loss) on derivative instruments, Tax Benefit (Expense)	1,909	(5,251)	(1,421)
Accumulated other comprehensive income, Tax Benefit (Expense)	3,750	(6,045)	(1,788)
Pension funded status adjustment, Net-of-Tax Amount	(5,470)	1,967	(685)
Unrealized gain (loss) on derivative instruments, Net-of-Tax Amount	(3,261)	9,470	2,626
Foreign currency translation adjustment, Net-of-Tax Amount	(32,356)	36,539	31,208
Accumulated other comprehensive income, Net-of-Tax Amount	(41,087)	47,976	33,149
Pension funded status adjustment, Ending Balance	(8,982)	(3,512)	(5,479)
Unrealized gain (loss) on derivative instruments, Ending Balance	1,175	4,436	(5,034)
Foreign currency translation adjustment, Ending Balance	81,900	114,256	77,717
Accumulated other comprehensive income, Ending Balance	$ 74,093	$ 115,180	$ 67,204

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Leases (Tables)

12 Months Ended

Mar. 31, 2012

Leases [Abstract]

Schedule Of Capital And Operating Leases

	Capital Leases		Operating Leases
2013	$	451	$	18,268
2014		475		13,478
2015		84		10,108
2016		14		6,981
2017		7		5,008
Thereafter		—		3,588
Total minimum lease payments		1,031	$	57,431
Amounts representing interest		101
Net minimum lease payments, including current portion of $409	$	930

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Stock-Based Compensation (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended					0 Months Ended	12 Months Ended
	Mar. 31, 2012 M	Mar. 31, 2011	Mar. 31, 2010	Mar. 31, 2012 Stock Options Issued Prior To Fiscal 2009 [Member]	Mar. 31, 2012 Stock Options Issued Prior To Fiscal 2008 [Member]	May 14, 2012 Restricted Stock Units [Member]	Mar. 31, 2012 Market Share Units [Member] Y	Mar. 31, 2011 Market Share Units [Member] Y	Mar. 31, 2012 Restricted Stock Units And Market Share Units [Member]	Mar. 31, 2011 Restricted Stock Units And Market Share Units [Member]	Mar. 31, 2010 Restricted Stock Units And Market Share Units [Member]	Mar. 31, 2010 10 Year Options [Member] Y	Mar. 31, 2010 3.5 Year Options [Member] Y	Mar. 31, 2012 Equity Incentive Plan [Member]	Mar. 31, 2012 Maximum [Member]	Mar. 31, 2012 Maximum [Member] Stock Options Issued In Fiscal 2010 [Member] Y	Mar. 31, 2012 Maximum [Member] Restricted Stock Units And Market Share Units [Member]	Mar. 31, 2012 Minimum [Member]	Mar. 31, 2012 Minimum [Member] Stock Options Issued In Fiscal 2010 [Member] Y	Mar. 31, 2012 Minimum [Member] Restricted Stock Units And Market Share Units [Member]	Mar. 31, 2012 Management And Other Key Employees [Member]	Mar. 31, 2011 Management And Other Key Employees [Member]	Mar. 31, 2012 Management And Other Key Employees [Member] Restricted Stock Units [Member]	Mar. 31, 2011 Management And Other Key Employees [Member] Restricted Stock Units [Member]	Mar. 31, 2012 Management And Other Key Employees [Member] Market Share Units [Member]	Mar. 31, 2011 Management And Other Key Employees [Member] Market Share Units [Member]	Mar. 31, 2012 Non-Employee Directors [Member] Restricted Stock Units [Member]	Mar. 31, 2011 Non-Employee Directors [Member] Restricted Stock Units [Member]	Mar. 31, 2012 Deferred Compensation Plans [Member] Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserves for grant														3,177,477
Shares available for future grants	2,872,490
Vesting period				3 years	4 years	4 years										3 years			6 months		4 years	4 years						13 months
Options expiration period (in years)																10			3.5
Stock-based compensation expense	$ 1,092	$ 2,333	$ 2,993						$ 10,493	$ 6,723	$ 3,968
Stock-based compensation expense, net of tax	822	1,844	2,095
Share-based compensation, tax benefit									2,599	1,659	1,190
Restricted stock units granted																											35,632	21,248	9,340
Market price per unit of stock award																							$ 35.79	$ 25.67	$ 48.36	$ 34.45	$ 22.45	$ 22.59
Percentage of restricted stock units granted, vested per year																					25.00%	25.00%
Risk-free interest rate							0.93%	1.30%				2.01%	0.93%
Dividend yield							0.00%	0.00%				0.00%	0.00%
Time of maturity, in years							3	3				5	2
Expected volatility							45.50%	43.00%				56.60%	56.60%
Stock unit grant during period						223,224																	95,026	291,701	224,397	124,091
Market share units converted into common stock for each unit															2		2.0	0		0
Market share units converted in to shares of common stock									zero and two shares
Conversion ratio									2
Unrecognized compensation expense associated with non-vested incentive awards outstanding	$ 18,451
Expected weighted average period	19
Weighted average fair value												$ 8.35	$ 5.15

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Consolidated Statements Of Changes In Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Common Stock [Member]	Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Total EnerSys Stockholders' Equity [Member]	Non-Controlling Interest [Member]	Total
Balance at Mar. 31, 2009	$ 498	$ 414,292	$ (19,800)	$ 241,106	$ 34,055	$ 670,151	$ 4,242	$ 674,393
Stock-based compensation		6,964				6,964		6,964
Exercise of stock options	6	5,036				5,042		5,042
Tax benefit from stock options		2,287				2,287		2,287
Increase in noncontrolling interest							85	85
Net earnings				62,304		62,304		62,304
Other comprehensive income:
Pension funded status adjustment, net of tax					(685)	(685)		(685)
Unrealized income (losses) on derivative instruments, net of tax					2,626	2,626		2,626
Foreign currency translation adjustment					31,208	31,208		31,208
Comprehensive income						95,453		95,453
Balance at Mar. 31, 2010	504	428,579	(19,800)	303,410	67,204	779,897	4,327	784,224
Stock-based compensation		9,056				9,056		9,056
Exercise of stock options	14	17,880				17,894		17,894
Tax benefit from stock options		6,082				6,082		6,082
Increase in noncontrolling interest							335	335
Net earnings				113,426		113,426		113,426	[1]
Other comprehensive income:
Pension funded status adjustment, net of tax					1,967	1,967		1,967
Unrealized income (losses) on derivative instruments, net of tax					9,470	9,470		9,470
Foreign currency translation adjustment					36,539	36,539		36,539
Comprehensive income						161,402		161,402
Balance at Mar. 31, 2011	518	461,597	(19,800)	416,836	115,180	974,331	4,662	978,993
Stock-based compensation		11,585				11,585		11,585
Exercise of stock options	4	970				974		974
Tax benefit from stock options		1,772				1,772		1,772
Purchase of common stock			(58,383)			(58,383)		(58,383)
Acquisition of noncontrolling interest		(1,000)				(1,000)		(1,000)
Noncontrolling interests attributable to the consolidation of acquisitions							8,260	8,260
Net earnings				144,003		144,003	(36)	143,967
Other comprehensive income:
Pension funded status adjustment, net of tax					(5,470)	(5,470)		(5,470)
Unrealized income (losses) on derivative instruments, net of tax					(3,261)	(3,261)		(3,261)
Foreign currency translation adjustment					(32,356)	(32,356)	(160)	(32,516)
Comprehensive income						102,916	(196)	102,720
Balance at Mar. 31, 2012	$ 522	$ 474,924	$ (78,183)	$ 560,839	$ 74,093	$ 1,032,195	$ 12,726	$ 1,044,921

[1] Included in Net earnings of fiscal 2011 were charges related to refinancing of $8,155 in the fourth quarter of fiscal 2011.

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Income Taxes (Reconciliation Of Income Taxes At The Statutory Rate) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Income Taxes [Abstract]
United States statutory income tax expense (at 35%)	$ 66,962	$ 53,005	$ 30,539
State income taxes, net of federal effect	1,592	3,035	(116)
Nondeductible expenses, domestic manufacturing deduction and other	1,587	(1,848)	3,799
Effect of foreign operations	(20,028)	(14,841)	(9,253)
Valuation allowance	(2,821)	(1,333)	(18)
Income tax expense	$ 47,292	$ 38,018	$ 24,951
United States statutory income tax expense rate percentage	35.00%

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Inventories

12 Months Ended

Mar. 31, 2012

Inventories [Abstract]

Inventories

3. Inventories

Net inventories consist of:

	March 31,
	2012		2011
Raw materials	$	100,538	$	92,928
Work-in-process		111,629		100,261
Finished goods		149,607		141,814
Total	$	361,774	$	335,003

Inventory reserves for obsolescence and other estimated losses, mainly relating to finished goods, were $14,831 and $15,052 at March 31, 2012 and 2011, respectively, and have been included in the net amounts shown above.

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Inventories (Summary Of Net Inventories) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
Inventories [Abstract]
Raw materials	$ 100,538	$ 92,928
Work-in-process	111,629	100,261
Finished goods	149,607	141,814
Total	$ 361,774	$ 335,003

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Derivative Financial Instruments (The Effect Of Derivative Instruments On The Consolidated Statements Of Income) (Details) (Designated As Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)	$ (9,883)	$ 9,064	$ 9,382
Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	(4,713)	190	5,342
Foreign Currency Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)	(152)	(4,031)	2,679
Lead Hedge Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)	(9,731)	15,930	9,844
Interest Rate Swap Contracts [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)		(2,835)	(3,141)
Interest Expense [Member] | Interest Rate Swap Contracts [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) Reclassified from AOCI into Income (Effective Portion)		(6,698)	(7,059)
Cost Of Goods Sold [Member] | Foreign Currency Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	(3,882)	471	428
Cost Of Goods Sold [Member] | Lead Hedge Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	$ (831)	$ 6,417	$ 11,973

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Secondary Offerings Of Common Shares (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2011	Mar. 31, 2010
Secondary Offerings Of Common Shares [Abstract]
Stockholders sold, common stock pursuant to effective shelf registration filed	2,845,869	3,200,000
Fees incurred related to the offerings	$ 615	$ 150

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Debt (Senior Unsecured 3.375% Convertible Notes) (Narrative) (Details) (USD $)	0 Months Ended	12 Months Ended
	May 28, 2008	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Convertible Notes [Member]
Debt Instrument [Line Items]
Face value of debt instrument	$ 172,500	$ 172,500
Interest rate of debt instrument		3.375%
Debt instrument maturity year		2038
Net proceeds received after deduction of commissions and offering expenses	168,200,000
Semi-annual payment of interest in arrears		June 1 and December 1
Maturity date of Convertible Notes		Jun. 01, 2038
Initial conversion rate		24.6305
Principal amount of Convertible Notes		1,000
Conversion price per share		$ 40.60
Redemption price percentage of debt instrument of accreted principal amount		100.00%
Minimum price of Common Stock per share for eligibility of make-whole premium payment		$ 29.00
Aggregate consideration on conversion shares		4,248,761
Interest rate percentage		8.50%
Amount of interest cost recognized for the amortization of the discount		6,435,000	5,917,000	5,439,000
Available lines of credit		377,230,000	356,447,000
Outstanding amount		95,340,000	95,049,000
Convertible Notes discount		24,228,000	30,663,000
Standby letters of credit		9,108,000	1,150,000
Senior Unsecured 3.375% Convertible Notes Due 2038 [Member]
Debt Instrument [Line Items]
Interest rate of debt instrument		3.375%
Debt instrument maturity year		2038
Amortized remaining discount period, in months		38
Interest paid		$ 8,933,000	$ 16,101,000	$ 16,456,000

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Restructuring Plans

12 Months Ended

Mar. 31, 2012

Restructuring Plans [Abstract]

Restructuring Plans

20. Restructuring Plans

      The Company has acquisition related restructuring plans and non-acquisition related restructuring plans and bases its restructuring accounting and disclosures on the applicable accounting guidance. As a result, charges to net earnings were made in the periods in which restructuring plan liabilities were incurred.

Acquisition related restructuring plan

       In fiscal 2010, the Company acquired the stock of OEB Traction Batteries and certain operating assets and liabilities of the reserve power battery business of Accu Holding AG and its Swedish sales subsidiary (all collectively referred to as "Oerlikon"). The Company completed the process of closing the two manufacturing facilities of Oerlikon during the third quarter of fiscal 2011, which resulted in the reduction of approximately 100 employees. The Company recorded restructuring charges related to this plan of $4,526 in fiscal 2010 through fiscal 2012. This plan has been completed as of March 31, 2012.

      A roll-forward of the acquisition related restructuring reserve is as follows:

	Employee Severance			Plant Closure and Other			Total
Balance at March 31, 2009	$	—		$	—		$	—
Accrued		1,269			—			1,269
Costs incurred		—			—			—
Foreign currency impact and other		23			—			23
Balance at March 31, 2010	$	1,292		$	—		$	1,292
Accrued		108			2,438			2,546
Costs incurred		(1,107	)		(2,313	)		(3,420	)
Foreign currency impact and other		(36	)		21			(15	)
Balance at March 31, 2011	$	257		$	146		$	403
Accrued		81			630			711
Costs incurred		(338	)		(776	)		(1,114	)
Balance at March 31, 2012	$	—		$	—		$	—

Non-acquisition related restructuring plans

      In February and May 2009, the Company announced a plan to restructure certain of its European and American operations, which resulted in a reduction of approximately 470 employees upon completion across its operations. These actions were primarily in Europe and included charges for employee-related severance payments and asset impairments, the most significant of which was the closure of its leased Italian manufacturing facility and the opening of a new Italian distribution center. The Company recorded restructuring charges of $31,894 in fiscal 2009 through fiscal 2011, with $105 of additional charges offset by a favorable accrual adjustment of $246 during fiscal 2012. The Company incurred $2,270 of costs against the accrual during fiscal 2012. This plan has been completed as of March 31, 2012.

      During fiscal 2011, the Company announced a further restructuring of its European operations, which will result in the reduction of approximately 60 employees upon completion across its operations. The Company estimates that the total charges for these actions will amount to approximately $5,200, primarily from cash expenses for employee severance-related payments and site closure costs. Based on commitments incurred to date, the Company recorded restructuring charges of $3,830 in fiscal 2011, with $1,783 of additional charges, offset by a favorable accrual adjustment of $435 related to the fiscal 2011 plan recorded in fiscal 2012. The Company incurred $1,316 of costs against the accrual during fiscal 2011, with an additional $3,263 of costs incurred during fiscal 2012. As of March 31, 2012, the reserve balance associated with these actions is $556. The Company does not expect to be committed to significant additional restructuring charges in fiscal 2013 related to these actions.

      During fiscal 2012, the Company announced restructuring plans related to its operations in Europe, primarily consisting of the transfer of manufacturing of select products between certain of its manufacturing operations and restructuring of its selling, general and administrative operations, which is expected to result in the reduction of approximately 80 employees upon completion. The Company estimates that the total charges for these actions will amount to approximately $4,200, primarily from cash expenses for employee severance-related payments. During fiscal 2012, the Company recorded restructuring charges of $3,070 and incurred $2,433 of costs against the accrual. As of March 31, 2012, the reserve balance associated with these actions is $630. The Company expects to be committed to an additional $1,100 of restructuring charges in fiscal 2013 related to these actions.

      A roll-forward of the non-acquisition related restructuring reserve is as follows:

	Employee Severance			Plant Closure and Other			Total
Balance at March 31, 2009	$	10,289		$	—		$	10,289
Accrued		10,107			2,263			12,370
Costs incurred		(13,276	)		(2,263	)		(15,539	)
Foreign currency impact and other		362			—			362
Balance at March 31, 2010	$	7,482		$	—		$	7,482
Accrued		4,267			—			4,267
Costs incurred		(6,945	)		—			(6,945	)
Foreign currency impact and other		116			—			116
Balance at March 31, 2011	$	4,920		$	—		$	4,920
Accrual adjustment		(681	)		—			(681	)
Accrued		4,958			—			4,958
Costs incurred		(7,966	)		—			(7,966	)
Foreign currency impact and other		(45	)		—			(45	)
Balance at March 31, 2012	$	1,186		$	—		$	1,186

XML

Restructuring Plans (Acquisition And Non-Acquisition Related Restructuring Reserve) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Acquisition Related Restructuring Reserve [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 403	$ 1,292
Accrued	711	2,546	1,269
Costs incurred	(1,114)	(3,420)
Foreign currency impact and other		(15)	23
Ending Balance		403	1,292
Non-Acquisition Related Restructuring Plans [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	4,920	7,482	10,289
Accrual adjustment	(681)
Accrued	4,958	4,267	12,370
Costs incurred	(7,966)	(6,945)	(15,539)
Foreign currency impact and other	(45)	116	362
Ending Balance	1,186	4,920	7,482
Employee Severance [Member] | Acquisition Related Restructuring Reserve [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	257	1,292
Accrued	81	108	1,269
Costs incurred	(338)	(1,107)
Foreign currency impact and other		(36)	23
Ending Balance		257	1,292
Employee Severance [Member] | Non-Acquisition Related Restructuring Plans [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	4,920	7,482	10,289
Accrual adjustment	(681)
Accrued	4,958	4,267	10,107
Costs incurred	(7,966)	(6,945)	(13,276)
Foreign currency impact and other	(45)	116	362
Ending Balance	1,186	4,920	7,482
Plant Closure And Other [Member] | Acquisition Related Restructuring Reserve [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	146
Accrued	630	2,438
Costs incurred	(776)	(2,313)
Foreign currency impact and other		21
Ending Balance		146
Plant Closure And Other [Member] | Non-Acquisition Related Restructuring Plans [Member]
Restructuring Cost and Reserve [Line Items]
Accrued			2,263
Costs incurred			$ (2,263)

XML

Valuation And Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012		Mar. 31, 2011		Mar. 31, 2010
Allowance For Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 10,547		$ 9,879		$ 7,978
Additions Charged to Expense	1,395		1,513		2,712
Charge-Offs	(2,012)		(1,673)		(1,257)
Purchase accounting adjustments
Other	92	[1]	828	[1]	446	[1]
Balance at End of Period	10,022		10,547		9,879
Allowance For Inventory Valuation [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	15,052		11,678		16,725
Additions Charged to Expense	7,659		8,329		1,704
Charge-Offs	(7,657)		(5,361)		(7,437)
Purchase accounting adjustments
Other	(223)	[1]	406	[1]	686	[1]
Balance at End of Period	14,831		15,052		11,678
Deferred Tax Asset-Valuation Allowance[Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	63,617		58,382		57,397
Additions Charged to Expense	2,457		825		894
Charge-Offs	(7,528)		(2,444)		(2,896)
Purchase accounting adjustments	1,124		5,340
Other	(3,311)	[1]	1,514	[1]	2,987	[1]
Balance at End of Period	$ 56,359		$ 63,617		$ 58,382

[1] Primarily the impact of currency changes.

XML

Leases (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Leases [Abstract]
Rental expense	$ 31,619	$ 28,047	$ 26,957

XML

Prepaid And Other Current Assets (Tables)

12 Months Ended

Mar. 31, 2012

Prepaid And Other Current Assets [Abstract]

Schedule Of Prepaid And Other Current Assets

	March 31,
	2012		2011
Prepaid non income taxes	$	23,737	$	22,753
Non-trade receivables		8,247		8,214
Prepaid income taxes		7,716		15,986
Lead hedges		—		9,575
Other		12,693		13,675
Total	$	52,393	$	70,203

XML

Income Taxes

12 Months Ended

Mar. 31, 2012

Income Taxes [Abstract]

Income Taxes

13. Income Taxes

Income tax expense is composed of the following:

	Fiscal year ended March 31,
	2012			2011			2010
Current:
Federal	$	30,459		$	24,232		$	9,000
State		3,778			2,736			(981	)
Foreign		16,282			14,114			9,957
Total current		50,519			41,082			17,976
Deferred:
Federal		(1,609	)		(1,358	)		4,678
State		(962	)		2,010			852
Foreign		(656	)		(3,716	)		1,445
Total deferred		(3,227	)		(3,064	)		6,975
Income tax expense	$	47,292		$	38,018		$	24,951

Earnings before income taxes consists of the following:

	Fiscal year ended March 31,
	2012		2011		2010
United States	$	87,597	$	57,710	$	37,418
Foreign		103,662		93,734		49,837
Earnings before income taxes	$	191,259	$	151,444	$	87,255

Income taxes paid by the Company for the fiscal years ended March 31, 2012, 2011 and 2010 were $38,482, $41,800 and $22,553, respectively.

The following table sets forth the tax effects of temporary differences that give rise to significant portions of the deferred tax assets and liabilities:

	March 31,
	2012			2011
Deferred tax assets:
Accounts receivable	$	1,111		$	1,304
Inventories		6,707			6,669
Net operating loss carryforwards		71,773			78,236
Accrued liabilities		26,997			22,061
Other assets		10,228			9,200
Gross deferred tax assets		116,816			117,470
Less valuation allowance		(56,359	)		(63,617	)
Total deferred tax assets		60,457			53,853
Deferred tax liabilities:
Property, plant and equipment		30,957			31,945
Other intangible assets		46,628			43,440
Convertible Notes		21,616			20,727
Other liabilities		2,400			4,992
Total deferred tax liabilities		101,601			101,104
Net deferred tax liabilities	$	(41,144	)	$	(47,251	)

The Company has approximately $11,139 in United States federal net operating loss carryforwards, approximately $3,375 of which are limited by Section 382 of the Internal Revenue Code, that begin to expire in the year ending 2023. The Company has approximately $235,000 of net operating loss carryforwards at March 31, 2012 that relate to the Company's foreign subsidiaries. Some of these net operating loss carryforwards have an unlimited life, while others expire at various times over the next 20 years. In addition, the Company also had approximately $45,559 of net operating loss carryforwards for state tax purposes that expire at various times over the next 20 years.

The Company has recorded a valuation allowance against certain federal net operating losses that are limited by Section 382. As of March 31, 2012 and 2011 these valuation allowances were $793 and $5,432, respectively. Of the decrease, $2,477 was recorded as a tax benefit primarily as a result of increasing the ownership in a domestic joint venture, and $2,162 was offset by a corresponding decrease to the net operating loss deferred tax asset due to the statutory limit on net operating loss usage pursuant to Section 382. The Company has also recorded a valuation allowance for net deferred tax assets in certain foreign and state tax jurisdictions, primarily related to net operating loss carryforwards, due to the significant losses incurred in these tax jurisdictions. As of March 31, 2012 and 2011 the valuation allowance associated with certain foreign tax jurisdictions was $53,206 and $55,738, respectively. As of March 31, 2012 and 2011 the valuation allowance associated with the state tax jurisdictions was $2,360 and $2,447, respectively. During the fiscal years ended March 31, 2012 and 2011, the Company recorded tax benefits of $2,940 and $2,498, respectively, due to the utilization of net operating loss carryforwards in certain foreign subsidiaries.

A reconciliation of income taxes at the statutory rate to the income tax provision is as follows:

	Fiscal year ended March 31,
	2012			2011			2010
United States statutory income tax expense (at 35%)	$	66,962		$	53,005		$	30,539
Increase (decrease) resulting from:
State income taxes, net of federal effect		1,592			3,035			(116	)
Nondeductible expenses, domestic manufacturing deduction and other		1,587			(1,848	)		3,799
Effect of foreign operations		(20,028	)		(14,841	)		(9,253	)
Valuation allowance		(2,821	)		(1,333	)		(18	)
Income tax expense	$	47,292		$	38,018		$	24,951

The effective income tax rate was 24.7% in fiscal 2012, compared to 25.1% in fiscal 2011 and 28.6% in fiscal 2010.

At March 31, 2012, the Company has not recorded United States income or foreign withholding taxes on approximately $494,000 of undistributed earnings of foreign subsidiaries that could be subject to taxation if remitted to the United States because the Company currently plans to keep these amounts permanently invested overseas. It is not practical to calculate the income tax expense that would result upon repatriation of these earnings.

The Company recognizes and measures uncertain tax positions taken, or expected to be taken, in a tax return in accordance with FASB guidance on accounting for uncertainty in income taxes.

A reconciliation of the beginning and ending amount of unrecognized tax benefits under FASB guidance is as follows:

March 31, 2009	$	13,305
Increases related to current year tax positions		919
Increases related to prior year tax positions due to foreign currency translation		5
Decreases related to prior year tax position settled		(2,940	)
Lapse of statute of limitations		(539	)
March 31, 2010		10,750
Increases related to current year tax positions		2,896
Increases related to prior year tax positions		324
Increases related to prior year tax positions due to foreign currency translation		122
Decreases related to prior year tax position settled		(3,145	)
Lapse of statute of limitations		(302	)
March 31, 2011		10,645
Increases related to current year tax positions		5,032
Increases related to prior year tax positions		182
Increases related to prior year tax positions due to foreign currency translation		(28	)
Decreases related to prior year tax position settled		—
Lapse of statute of limitations		(2,886	)
March 31, 2012	$	12,945

All of the balance of unrecognized tax benefits at March 31, 2012 and 2011, if recognized, would be included in the Company's consolidated statements of income and have a favorable impact on both the company's statements of income and effective tax rate.

The Company and its subsidiaries file income tax returns in the U.S. federal jurisdiction, and various states and foreign jurisdictions. With few exceptions, the Company is no longer subject to U.S. federal, state and local, or non-U.S. income tax examinations by tax authorities for years before 2006.

The Company anticipates that it is reasonably possible that a portion of the March 31, 2012 balance of the unrecognized tax benefits could be recognized within the next twelve months due to the expiration of the relevant statutes of limitations. An estimate of the range of the adjustments cannot be made at this time.

The Company recognizes tax related interest and penalties in income tax expense in its consolidated statements of income. As of March 31, 2012 and 2011, the Company had an accrual of $575 and $675, respectively, for interest and penalties.

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Retirement Plans (Summary Of Pension Plan Investments Measured At Fair Value) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012		Mar. 31, 2011		Mar. 31, 2010
United States Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement	$ 9,192		$ 8,746		$ 7,859
United States Plans [Member] | Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement	868		528
United States Plans [Member] | US Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement	5,067	[1]	4,839	[1]
United States Plans [Member] | International Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement	837	[2]	840	[2]
United States Plans [Member] | Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement	2,420	[3]	2,539	[3]
United States Plans [Member] | Quoted Price In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement	9,192		8,746
United States Plans [Member] | Quoted Price In Active Markets For Identical Assets (Level 1) [Member] | Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement	868		528
United States Plans [Member] | Quoted Price In Active Markets For Identical Assets (Level 1) [Member] | US Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement	5,067	[1]	4,839	[1]
United States Plans [Member] | Quoted Price In Active Markets For Identical Assets (Level 1) [Member] | International Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement	837	[2]	840	[2]
United States Plans [Member] | Quoted Price In Active Markets For Identical Assets (Level 1) [Member] | Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement	2,420	[3]	2,539	[3]
United States Plans [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement
United States Plans [Member] | Significant Other Observable Inputs (Level 2) [Member] | Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement
United States Plans [Member] | Significant Other Observable Inputs (Level 2) [Member] | US Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement		[1]		[1]
United States Plans [Member] | Significant Other Observable Inputs (Level 2) [Member] | International Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement		[2]		[2]
United States Plans [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement		[3]		[3]
United States Plans [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement
United States Plans [Member] | Significant Unobservable Inputs (Level 3) [Member] | Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement
United States Plans [Member] | Significant Unobservable Inputs (Level 3) [Member] | US Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement		[1]		[1]
United States Plans [Member] | Significant Unobservable Inputs (Level 3) [Member] | International Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement		[2]		[2]
United States Plans [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement		[3]		[3]
International Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement	26,942		25,779		22,712
International Plans [Member] | US Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement	2,742	[1]	2,521	[1]
International Plans [Member] | International Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement	14,728	[2]	13,600	[2]
International Plans [Member] | Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement	9,472	[3]	9,658	[3]
International Plans [Member] | Quoted Price In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement	26,942		25,779
International Plans [Member] | Quoted Price In Active Markets For Identical Assets (Level 1) [Member] | US Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement	2,742	[1]	2,521	[1]
International Plans [Member] | Quoted Price In Active Markets For Identical Assets (Level 1) [Member] | International Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement	14,728	[2]	13,600	[2]
International Plans [Member] | Quoted Price In Active Markets For Identical Assets (Level 1) [Member] | Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement	9,472	[3]	9,658	[3]
International Plans [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement
International Plans [Member] | Significant Other Observable Inputs (Level 2) [Member] | Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement
International Plans [Member] | Significant Other Observable Inputs (Level 2) [Member] | US Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement		[1]		[1]
International Plans [Member] | Significant Other Observable Inputs (Level 2) [Member] | International Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement		[2]		[2]
International Plans [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement		[3]		[3]
International Plans [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement
International Plans [Member] | Significant Unobservable Inputs (Level 3) [Member] | Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement
International Plans [Member] | Significant Unobservable Inputs (Level 3) [Member] | US Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement		[1]		[1]
International Plans [Member] | Significant Unobservable Inputs (Level 3) [Member] | International Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement		[2]		[2]
International Plans [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Fair Value Measurement		[3]		[3]

[1] US equities include companies that are well diversified by industry sector and equity style (i.e., growth and value strategies). Active and passive management strategies are employed. Investments are primarily in large capitalization stocks and, to a lesser extent, mid- and small-cap stocks.

[2] International equities are invested in companies that are traded on exchanges outside the U.S. and are well diversified by industry sector, country and equity style. Active and passive strategies are employed. The vast majority of the investments are made in companies in developed markets with a small percentage in emerging markets.

[3] Fixed income consists primarily of investment grade bonds from diversified industries.