Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes o No ý

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 o No ý

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. Yes ý No o

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 during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes ý No o

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K 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. o

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 the definitions of "large accelerated filer," "accelerated filer" and "smaller reporting company" in Rule 12b-2 of the Exchange Act. (Check one):

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes o No ý

The aggregate market value of the voting and non-voting common equity held by non-affiliates computed at $5.32 per share, the price at which the common equity was last sold on the NASDAQ Global Select Market on June 30, 2011, the last business day of the registrant's most recently completed second fiscal quarter, was $546,375,821.

Number of shares outstanding of the registrant's Common Stock, $0.001 par value, as of March 5, 2012: 146,862,868.

Portions of our definitive proxy statement to be filed with the Securities and Exchange Commission for our 2012 annual meeting of stockholders to be held on May 23, 2011 are incorporated by reference into Part II and Part III of this Report.

A123 Systems, Inc.
Annual Report on Form 10-K
For the Fiscal Year Ended December 31, 2011


		Page Number
*PART I.*
ITEM 1: Business		1
ITEM 1A: Risk Factors		27
ITEM 1B: Unresolved Staff Comments		58
ITEM 2: Properties		58
ITEM 3: Legal Proceedings		59
ITEM 4: Mine Safety Disclosures		60
*PART II.*
ITEM 5: Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities		61
ITEM 6: Selected Financial Data		63
ITEM 7: Management's Discussion and Analysis of Financial Condition and Results of Operations		65
ITEM 7A: Quantitative and Qualitative Disclosures About Market Risk		90
ITEM 8: Financial Statements and Supplementary Data		91
ITEM 9: Changes in and Disagreements With Accountants on Accounting and Financial Disclosure		136
ITEM 9A: Controls and Procedures		136
ITEM 9B: Other Information		142
*PART III.*
ITEM 10: Directors, Executive Officers and Corporate Governance		143
ITEM 11: Executive Compensation		147
ITEM 12: Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters		147
ITEM 13: Certain Relationships and Related Transactions, and Director Independence		147
ITEM 14: Principal Accounting Fees and Services		147
*PART IV.*
ITEM 15: Exhibits, Financial Statement Schedules		148
Signatures		149
EX-10.32 Form of Executive Restricted Stock Unit Agreement under 2009 Stock Incentive Plan
EX-10.33 Form of Amended and Restated Executive Retention Agreement executed between the Registrant and each of David Prystash, Robert Johnson, Gilbert Neal Riley, Jr., Eric Pyenson, Louis Golato, and Jason Forcier
EX-10.34 Form of Executive Retention Agreement
EX-10.35 Amended and Restated Executive Retention Agreement dated as of February 8, 2012 by and between the Registrant and David Vieau
EX-10.36 Patent Sublicense Agreement, dated October 31, 2011, between the Registrant and LiFePO4+C Licensing SG
EX-10.37 Technology License Agreement, dated November 3, 2011, between the Registrant and IHI Corporation
EX-10.38 Stock Purchase Agreement, dated November 3, 2011, between the Registrant and IHI Corporation
EX-10.39 First Amendment to Lease Agreement dated, December 13, 2011, by and between Flanders 155 LLC and the Registrant
EX-21.1 Subsidiaries of the Registrant
EX-23.1 Consent of Deloitte & Touche LLP, Independent Registered Accounting Firm

Certain statements in this report contain "forward-looking statements" within the meaning of Section 21E of the Securities Exchange Act of 1934, as amended, or the Exchange Act. These statements are often identified by the use of words such as "may," "expect," "believe," "anticipate," "intend," "could," "estimate," or "continue," and similar expressions or variations. All statements other than statements of historical fact are statements that could be deemed forward-looking statements, including without limitation statements regarding industry trends, management's expectations, competitive strengths or market position, market expectations, business opportunities, projections of revenue, expenses, profits, management's confidence in our strategies and other matters that do not relate strictly to historical facts. Such forward-looking statements are subject to risks, uncertainties and other factors that could cause actual results and the timing of certain events to differ materially from future results expressed or implied by such forward-looking statements. Factors that could cause or contribute to such differences include, but are not limited to, those discussed in the section titled "Risk Factors," set forth in Part I, Item 1A of this Annual Report on Form 10-K and elsewhere in this Annual Report on Form 10-K. The forward-looking statements in this Annual Report on Form 10-K represent our views as of the date of this Annual Report on Form 10-K. We anticipate that subsequent events and developments will cause our views to change. We undertake no obligation to update these forward-looking statements except to the extent required by applicable law. You should, therefore, not rely on these forward-looking statements as representing our views as of any date subsequent to the date of this Annual Report on Form 10-K.

We design, develop, manufacture and sell advanced, rechargeable lithium-ion batteries and energy storage systems. We believe that lithium-ion batteries will play an increasingly important role in facilitating a shift toward cleaner forms of energy. Using our innovative approach to materials science and battery engineering and our systems integration and manufacturing capabilities, we have developed a broad family of high-power lithium-ion batteries and battery systems. This family of products, combined with our strategic partner relationships in the transportation, electric grid services and commercial markets, positions us well to address these markets for next-generation energy storage solutions.

In our largest target market, the transportation industry, we are working with major global automotive manufacturers and tier 1 suppliers to develop batteries and battery systems for hybrid electric vehicles, or HEVs, plug-in hybrid electric vehicles, or PHEVs, and electric vehicles, or EVs. For example, we are designing and developing batteries and battery systems for ALTe, Axeon, BAE Systems, BMW, Daimler, Delphi, Fisker Automotive, Inc., or Fisker, General Motors, or GM, Magna Steyr, Navistar, Shanghai Automotive Industry Corp., or SAIC, Smith Electric Vehicles, Via Motors, and other customers, for multiple vehicle models. As of January 2012, we had 22 transportation programs that are either sourced for production or in production.

Our transportation business is divided into two categories: heavy-duty and passenger. In the heavy-duty, commercial-vehicle market, we are engaged in design and development activities with multiple heavy-duty vehicle manufacturers and tier 1 suppliers regarding their HEV, PHEV and EV development efforts for trucks and buses, and we have been selected to co-develop battery systems for several of them. For example, pursuant to our supply agreement with Magna Steyr, we are providing batteries for use in battery systems developed by Magna Steyr for deployment in a heavy-duty HEV application. In addition, we have a long-term supply agreement with BAE Systems, pursuant to which we are in volume production for battery systems for BAE Systems' HybriDrive propulsion system,

which is currently being deployed in buses sold to various manufacturers, including Daimler's Orion VII hybrid electric buses. Our battery systems include both roof mount and cabin mount designs for use in a number of different heavy-duty vehicles. We are supplying Navistar battery systems for eStar electric vehicles. We also have been selected to develop the battery system for an additional Daimler hybrid electric bus program.

In the market for passenger vehicles, we currently supply advanced automotive battery systems to Fisker for their Karma PHEV, as part of a multi-year supply agreement. We are also supplying battery systems to BMW for their 2012 ActiveHybrid HEV programs. We have been selected to develop battery packs for a new, 2012 model year electric passenger car from SAIC, the largest automaker in China, and we are currently providing the development work related to this agreement. We have also established a joint venture with SAIC which will assemble battery packs for subsequent sale to SAIC. The joint venture agreement provides that we will supply the joint venture with battery cells for its production of packs. Additionally, we currently supply battery technology to SAIC for several of its other electric drive-train vehicles in development, including the Roewe 750 hybrid electric sedan and the Roewe 550 plug-in hybrid electric sedan. We have also been selected by GM to supply battery packs for the Chevrolet Spark EV, a new EV expected to be sold globally in multiple markets starting in 2013.

We also have been awarded production programs with a number of OEMs for starter batteries or micro hybrid batteries.

In addition to the activities described above, we have entered into development programs with other major passenger original equipment manufacturers, or OEMs, and are bidding for programs with several other vehicle manufacturers to develop and/or supply batteries and battery systems for HEVs, PHEVs and EVs.

Our cylindrical batteries are in volume production and are commercially available for use in automotive and heavy duty vehicles. Our next-generation prismatic batteries are currently being produced in our Livonia, Michigan facility, which officially opened in September, 2010. This 291,000 square foot facility enables the complete production process, including research and development, manufacturing of high-value components, cell fabrication, module fabrication and the final assembly of complete battery packs ready for vehicle integration. We have expanded our overall manufacturing capabilities by approximately 500 megawatt hours per year, bringing our manufacturing capabilities to more than 645 megawatt hours annually at the end of 2011. As part of our continuing U.S. manufacturing ramp-up, we also opened a coating plant in Romulus, Michigan, which came on line during the first half of 2011 and completed qualification in October, 2011.

In another key market, we also produce energy storage solutions that improve the reliability and efficiency of the electric power grid and help to integrate renewable sources of power generation. We have leveraged our patented Nanophosphate® technology to deliver dynamic energy storage solutions for power generation, transmission and distribution. We design, manufacture and install multi-megawatt battery systems with integrated power electronics and smart grid control systems that provide electric and ancillary services such as standby reserve capacity and regulation services. Our products provide standby reserve capacity, by delivering power quickly in order to offset supply shortages caused by generator or transmission outages, and regulation, by regulating the minute-to-minute frequency fluctuations in the grid that are caused by instantaneous changes in supply and demand. Our systems can also be used to smooth the intermittent output from wind and solar generation facilities. As these facilities are expected to represent a larger percentage of total generating capacity, our systems will become increasingly important. The AES Gener Los Andes substation in the Atacama Desert is a frequency regulation and spinning reserve project helping to improve the reliability of the electric grid in Northern Chile. AES Gener is receiving additional revenue for its increased output capacity enabled by our battery system installed there. We have also delivered a multi-megawatt system to AES for use

in Westover, New York and a 32-megawatt system that AES has deployed in Mt. Laurel, West Virginia. In addition, we have delivered two systems to Edison Material Company, a Southern California Edison Company, or SCE, for use in a pilot program. By the end of 2011, we had shipped more than 90 megawatts of grid energy storage systems worldwide.

Grid operators in New England (ISONE), the Mid-Atlantic (PJM), New York (NYISO), the Midwest (MISO) and California (CAISO) allow energy storage providers to sell grid ancillary services, such as spinning reserve and frequency regulation, in their respective electricity markets. On October 20, 2011, the Federal Energy Regulatory Commission (FERC) issued pay-for-performance rules for frequency regulation in organized electricity markets. The 'pay for performance' principle recognizes that faster and more accurate resources provide greater benefits to the grid, and those resources should be compensated for that additional capability. Our batteries can respond nearly instantaneously to commands to increase or decrease output. As more markets develop market structures that compensate these fast-responding resources, we believe that our customers will realize higher value from deploying our grid systems. The end result is that through proper design, the market will provide the most efficient and least-cost mix of resources for regulation service.

We are also focusing on the commercial market. We first commercialized our battery technologies for use in cordless power tools. We have agreements with The Gillette Company, a wholly-owned subsidiary of The Procter & Gamble Company, to supply Gillette with materials and technology for use in their consumer products. In other commercial areas, we believe our products are well-suited to applications in telecommunications, IT infrastructure, medical systems, auxiliary power units, or APU's, material handling equipment and industrial controls.

During 2009, 2010 and 2011, 59%, 59% and 61% of our product revenue was derived from sales in the transportation market, 15%, 18% and 28% was derived from sales in the electric grid market, and 26%, 23% and 11% was derived from sales in the commercial market, respectively. For the year ended December 31, 2011, revenue from our two largest customers, Fisker and AES Energy Storage, LLC and its affiliates, or AES, represented 26% and 24% of our revenue, respectively.

Our proprietary technology includes nanoscale materials initially developed at and exclusively licensed from the Massachusetts Institute of Technology. We are developing new generations of this core Nanophosphate® technology, as well as other battery technologies, to achieve additional performance improvements and to expand the range of applications for our batteries. For example, for the 2009 Formula One racing season, we developed an ultra high power battery for Mercedes-Benz HighPerformanceEngines for use by the Vodafone McLaren Mercedes team that provided more than ten times the power density (W/kg) as compared to a standard Prius battery. In addition, we are working on next generation technology for this application.

Our research and development team comprises over 373 employees and has significant expertise in battery materials science, process engineering and battery-package engineering, as well as battery system design and integration. As of December 31, 2011, we own or exclusively license 75 issued patents and more than 335 pending patents in the United States and internationally.

We are taking advantage of programs established by the U.S. Federal government and various State government programs to stimulate the economy and increase domestic investment in the battery industry and we intend to continue doing so. Access to these State and Federal government funds offsets some of our capital expenditure and operating cash needs. For additional details of these government programs see the Government Initiatives and Contract Research section in Item I of this Annual Report on Form 10-K.

We perform most of our manufacturing at our facilities using our proprietary, high-volume process technologies. Our internal manufacturing operations allow us to directly control product quality and minimize the risks associated with disclosing proprietary technology to outside parties during

production. We control every stage in the manufacture of our products except for the final assembly of one battery cell model and certain battery systems. Over the past several years, we have developed high-volume production expertise and replicable manufacturing processes that we believe we can scale to meet increasing demands for our products. Our manufacturing processes can be modified to manufacture battery products for different applications and can be replicated to meet increasing customer demands. As of December 31, 2011, our annual manufacturing capacity was approximately 645.8 million watt hours. We have approximately 840,000 square feet of manufacturing facilities in China; Korea; Livonia, Michigan; Romulus, Michigan; Hopkinton, Massachusetts and Westborough, Massachusetts available for active manufacturing use. In conjunction with receiving federal and state incentive funding, we are currently expanding our domestic battery manufacturing capacity. This expansion would complement our existing manufacturing facilities in Asia.

We were incorporated in 2001. We began selling our first products commercially in the first quarter of 2006. We have approximately 2,000 employees worldwide. Our revenue has grown from $91.0 million for the year ended December 31, 2009 to $97.3 million for the year ended December 31, 2010 and to $159.1 million for year ended December 31, 2011. We experienced net losses of $85.8 million, $152.6 million and $257.7 million for the years ended December 31, 2009, 2010 and 2011, respectively.

We measure our product shipments in Wh, which refers to the aggregate amount of energy that could be delivered in a single complete discharge by a battery. We calculate Wh for each of our battery models by multiplying the battery's amp hour, or Ah, storage capacity by the battery's voltage rating. For example, our 26650 battery is a 2.3 Ah battery that operates at 3.3 V, resulting in a 7.6 Wh rating. We determine a battery's Ah storage capacity at a specific discharge rate and a specific depth of discharge. We do this by charging the battery to its top voltage and by discharging it to zero capacity (2 volt charge level). The Wh metric allows us and our investors to measure our manufacturing capacity and shipments, regardless of battery voltages and Ah specifications, utilizing a uniform and consistent metric.

The world economy is undergoing a transformation driven by rising demands for high-output, fuel-efficient energy solutions that are less harmful to the environment. Global economic growth, geo-political conflict in oil-producing regions and escalating exploration and production costs are increasing market demand for innovative energy alternatives that can help reduce dependence on oil. Meanwhile, heightened concerns about global warming and climate change are giving rise to stricter environmental standards and stronger regulatory support for energy sources that are not harmful to the environment. As a result, clean energy technologies are experiencing increasing popularity and greater adoption which is fueling continued innovation and improving the economic viability of such technologies. We believe these clean energy trends are contributing to a growing demand for advanced battery technologies in end markets such as transportation, electric grid services and commercial.

We believe consumers are shifting away from conventional gasoline engines to HEVs, PHEVs and EVs because of the high prices of conventional fuel, greater awareness of environmental issues and government regulation. These vehicles offer improved gas mileage and reduced carbon emissions, and may ultimately provide a vehicle alternative that eliminates the need for conventional gasoline engines. Industry experts project that by 2020, almost half of U.S. vehicles will require some form of battery technology to meet new Corporate Average Fuel Economy, or CAFE, regulatory standards. President Obama has announced national standards to cut emissions and increase gas mileage, mandating that

U.S. passenger vehicles and light trucks must average 35.5 miles per gallon by 2016. On November 16, 2011, the U.S. Environmental Protection Agency or EPA and National Highway Traffic Safety Administration or NHTSA issued their joint proposal to extend emissions and fuel economy standards to model year 2017-2025. The proposed standards are projected to require on an average industry fleet wide basis 163 grams/mile of carbon dioxide, which is equivalent to 54.5 miles per gallon (mpg).

In addition, state and federal governments continue to implement economic incentives related to fuel efficiency. For example, since February 2009, the U.S. government has, among other things, provided for a tax credit of between $2,500 and $7,500 for the purchase of plug-in electric vehicles depending on the battery capacity. Moreover, governments across the globe are considering or have already implemented policies which similarly support vehicle electrification. While the mix between regulatory constraints and incentives vary by country, we believe the overall effect is increasing demand for greener vehicle technologies including advanced batteries.

On a cost per mile driven basis, electricity is a more economical source of energy than gasoline. However, the vehicle operating savings of using electricity have been historically more than offset by the cost of the corresponding electrical powertrains. With the advancement of battery technologies, the use of battery systems to deliver energy to hybrid powertrains is becoming more economically attractive. We believe this trend will lead to increased adoption of HEVs, PHEVs and EVs and, as a result, create significant opportunities for battery suppliers with the necessary technology, experience and manufacturing capabilities to develop high performance batteries. We expect that if consumers begin realizing more immediate cost savings by switching away from gasoline powered vehicles to hybrid vehicles, the resulting increased adoption of HEVs, PHEVs and EVs will significantly contribute to the growth of the next-generation battery market. The growth in HEVs will likely include start-stop or micro hybrids, which can offer fuel savings with relatively minor modifications in the vehicle.

Similar industry dynamics are creating a demand for new battery technology applications in the heavy-duty transportation market, particularly in buses, trucks and other industrial vehicles. The higher fuel consumption rate of these large vehicles makes the potential fuel cost savings derived from the use of batteries even greater. In addition, these vehicles are typically used for more hours per day than passenger vehicles, which help provide a faster return on investment. Several government authorities and corporations are evaluating battery technologies for their large fleets of heavy-duty vehicles. For example, the City of London has announced plans to convert its fleet of buses to HEVs and had 200 hybrid buses on January 26, 2012, making it the largest fleet of these environmentally friendly vehicles in the United Kingdom.

Applications in the electric grid market present another significant opportunity for the use of advanced battery systems. Performance and reliability are essential to electric transmission and distribution grids. To preserve electric grid integrity, grid operators often need to call on resources to provide critical ancillary services such as standby reserve capacity and frequency regulation services. Resources required for standby reserve capacity services must ramp up and down quickly to offset sudden, short-term generator or transmission line outages. Resources for frequency regulation services are called upon to adjust for minute-to-minute frequency fluctuations in the grid due to demand and supply changes. Traditionally, these grid services are provided by running select power plants on the grid below their full load capability so they can be called on and ramped up quickly as needed. Advanced batteries capable of providing rapid charge and discharge cycles as well as high power over a long period provide these services more cost effectively and efficiently than running power plants at sub-optimal operating levels. FERC has issued pay-for-performance rules which reward fast-performing resources appropriate for the services they offer. Through the use of batteries, the portion of power plant capacity normally reserved for ancillary services to provide standby reserve capacity and frequency

regulation can be freed up to operate at full capacity and produce more electricity and associated revenue.

We believe the escalating demand for renewable energy technologies will serve as an additional catalyst for the adoption of advanced batteries in electric grid applications. Wind and solar energy facilities are expected to be important sources of new electricity generation in the future. However, wind and solar are intermittent power sources that put additional demands on grid stabilization. Advanced batteries can be used to supplement these new generation technologies by smoothing their output providing regulation services and excess energy storage during periods of high transmission line usage or low customer demand.

The ARRA provides for $4.5 billion in direct spending on the U.S. electric grid, including funds to modernize the grid with so-called "Smart Grid" technologies, which are intended to stimulate investment by utilities in a smarter, more efficient grid and cleaner, renewable electricity generation technology. Emerging Smart Grid practices and technologies, such as the deployment and integration of advanced energy storage technologies, are designed to modernize the electric power grid. We believe utility companies that benefit from the ARRA's Smart Grid initiative will increase spending on advanced batteries and battery systems.

Commercial applications represent another attractive market for advanced batteries. There are two types of batteries for commercial applications: high-energy batteries and high-power batteries. High-energy batteries are designed to store large amounts of energy for long periods, but are not required to release this energy at a high rate. These batteries are used in certain portable consumer electronics such as laptop computers, PDAs and cell phones, which require gradual, consistent delivery of energy in low-power form. High-power batteries, on the other hand, are designed not only to store large amounts of energy, but also to deliver it at a very high rate, or in high-power form. While the battery market for high energy, low-power portable consumer products is mature and well supplied by several vendors, a market opportunity exists for advanced batteries that can deliver high-power in a light-weight and portable package.

High-power batteries can transform appliances, tools and equipment traditionally powered from electric outlets into more convenient, portable devices. These batteries are currently being used in cordless power tools with additional potential applications in home appliances and commercial cleaning equipment. Consumers in these initial applications continue to demand high-power batteries for portable applications that are smaller, lighter and longer lasting than those currently used. In addition, with escalating environmental concerns around battery disposal, the market is also increasingly focused on replacing battery technologies which utilize toxic metals such as nickel or lead.

The performance and specific characteristics of rechargeable batteries depend on the properties of their materials, the design of the batteries and the battery systems and the manufacturing process. Providers of rechargeable batteries face a number of challenges in addressing the requirements of transportation, electric grid services and commercial applications:

The most prevalent battery technologies currently available that address the transportation, electric grid services or commercial markets include:

We believe our batteries and battery systems overcome the limitations of other currently available lithium-ion formulations and non-lithium-ion battery technologies. Our solution is based on proprietary Nanophosphate® chemistry originally developed by one of our founders, along with others, at the Massachusetts Institute of Technology and is exclusively licensed to us. We continue to innovate our battery chemistry by improving our existing Nanophosphate® chemistry and exploring new material chemistries. Our battery chemistry is supplemented with innovative battery designs as well as systems and pack technologies that increase the performance and scalability of battery systems used for high-power applications. As a result, while other battery technologies offer competitive performance in some metrics, we believe our batteries and battery systems deliver superior performance by combining the following key characteristics:

We believe the following combination of capabilities distinguishes us from our competitors and positions us to compete effectively and benefit from the expected growth in the advanced energy storage market:

Our goal is to utilize our materials science expertise, our systems engineering expertise and our manufacturing process technologies to provide advanced energy storage solutions. We intend to pursue the following strategies to attain this goal:

Our current product offerings include batteries in various sizes and forms as well as packaged modules and fully-tested battery systems. The platform for battery and battery system development is our patented Nanophosphate® material, which can be engineered to meet the strict requirements of a broad set of applications in our target markets.

Our batteries based on our Nanophosphate® technology for application development in the transportation, electric grid services and commercial markets, as summarized below:

Our energy solutions group offers a variety of fully-packaged systems as well as sub-module building blocks for battery system development. Our development of integrated systems includes not only the packaging of our batteries, but also power electronics, safety systems, thermal management, testing, production and qualification. We design standard systems as well as custom systems using a modular design based on standard building blocks. We manufacture a variety of battery systems, in which cells or modules are connected in various configurations to meet the design requirements of specific applications. The following are examples of a modular building block based on our 32113 HEV cylindrical cells and various module designs using our scalable 20Ah prismatic cells.

Our prismatic battery system's design allows for various battery configurations, providing pack design versatility for the automotive market. This design reduces retooling time when reconfiguring our assembly lines for different customers. Our battery systems are highly engineered to incorporate safety and control features that extend life and improve performance. Module-level fusing, temperature sensing and other safety controls provide additional containment safeguards to isolate and protect against cell-level failure. Active overvoltage protection provides monitoring and balancing of individual series elements to protect cells from abuse and to extend life. These battery systems are designed to accommodate either liquid or air-cooled thermal management systems, and have mechanical structures

designed to withstand the harsh vibration and mechanical shock environment of automotive applications.

Lithium-ion batteries are rechargeable batteries in which lithium is reversibly transported through a nonaqueous liquid electrolyte, or ionically conductive medium, between positive and negative electrodes that store lithium in the solid state. Lithium-ion batteries are distinguished from disposable lithium batteries, or rechargeable lithium metal batteries, by not utilizing metallic lithium as a negative electrode material. Instead, both electrodes utilize compounds in which lithium atoms may be stored at relatively high concentrations without forming lithium metal, an attribute that is key to safe and prolonged recharging. The non-aqueous electrolyte in lithium-ion batteries allows operation at a high voltage (up to 4.4 V for current technology) without suffering electrolyte decomposition. The combination of a high voltage and high charge storage capacity in both the positive and negative electrodes provides for the high specific energy (50-230 Wh/kg) and energy density (100-450 Wh/liter) of current lithium-ion batteries. These energy values span a wide range for several reasons. Batteries designed for high power typically utilize thin electrode coatings which result in lower overall active materials content and therefore lower energy. The energy per mass and per volume also varies with form factor, cylindrical batteries typically having higher values than prismatic batteries, and battery size, smaller batteries typically having lower values due to higher packaging factor. Importantly, the choice of positive and negative electrode materials has a large impact on the energy that can be stored and the power that can be delivered using a specific battery.

We are primarily focused on developing a new generation of lithium-ion batteries and battery systems to serve applications and markets outside the historical domain of lithium-ion. These applications include HEVs, PHEVs and EVs, electric grid services, industrial, and commercial products. These applications frequently require battery systems having much higher total energy or power outputs than required by previous lithium-ion applications, and place a premium on one or more of the attributes of high energy, high power, improved safety, long life, and high reliability. We also maintain

an active research and development effort to develop future generations of materials for several key components of battery systems, and improved battery and battery systems designs to take advantage of the attributes of those materials.

Our primary customers are industry-leading companies that value and require high battery performance. Our customers and development partners span multiple industries and include the following organizations, in addition to others, in our target markets:

We also sell our batteries and battery systems directly to end-user customers as well as through reseller and distributor channels.

Our contracts with customers include the purchase of our products, and in some cases, engineering and design work, maintenance and support services. These contracts include terms and conditions, including payment, delivery and termination that we believe are customary and standard in our industry. The majority of our customers are not contractually committed to purchase any minimum quantities of products from us and orders are generally cancelable prior to shipment. In addition, government entities may terminate their contracts with any party at any time. As a result, we do not disclose our order backlog, since we believe that our order backlog at any particular date is not necessarily indicative of actual revenue for any future period.

Pursuant to our joint venture agreement with SAIC, we have invested $4.7 million into the joint venture in return for a 49% ownership interest in the joint venture. The agreement provides that our subsidiary is responsible for supplying the joint venture with our battery cells according to the joint venture's production plan and for providing certain services and granting technology licenses to the joint venture under terms and conditions, including fees and royalties, to be agreed upon. Both parties agreed not to establish any new joint venture or any new business in China that would compete with the joint venture's activities in China. The agreement is for a twenty-year term and may be extended by mutual agreement of the joint venture parties and approval of the relevant Chinese authorities. In connection with the agreement, we irrevocably and unconditionally guaranteed to SAIC the full and prompt performance by our subsidiary of its obligations under the agreement.

Under our exclusive license agreement with Gillette, Gillette paid us an up-front, support and additional license fees totaling $28.0 million. In addition, the agreement requires Gillette to pay us royalty fees on net sales of products that include our technology. We have agreed with Gillette that if, during a certain period following execution of the license agreement, we enter into an agreement with a third party that materially restricts Gillette's license rights under the license agreement, then we may be required to refund to Gillette all license and support fees paid to us by Gillette under the license agreement, plus, in certain cases, an additional amount to cover Gillette's capital and other expenses paid and/or committed by Gillette in reliance upon its rights under the license agreement.

In January 2010, we entered into an agreement to purchase preferred stock of Fisker, an automaker of PHEV and EV vehicles. We invested $13.0 million in cash, and 479,282 shares of our common stock, which, when transferred to Fisker, had a fair market value of $7.5 million. We also entered into a supply agreement with Fisker to supply prismatic batteries that are being used in the Fisker Karma PHEV. During the year ended December 31, 2011, we elected not to participate in Fisker's subsequent stock financing. This election not to participate resulted in the conversion of our preferred shares of Fisker to common shares on a 2:1 ratio. As such, we performed an analysis and valuation of our investment in Fisker resulting to the recognition of an impairment charge of $11.6 million for the year ended December 31, 2011.

In August 2010, we entered into an agreement with 24M Technologies, Inc., or 24M, a company focused on battery development to improve on energy storage capabilities, to transfer certain patents in return for a minority ownership interest in 24M.

In November 2011, we entered into an expanded partnership with IHI Corporation, or IHI, a 150-year old, $13-billion Japanese company that develops solutions for a number of diverse global industries, including automotive, energy, aerospace, and marine. Pursuant to our agreement with IHI Corporation, we have licensed our battery system technology to IHI to develop solutions for the Japanese transportation market, which we believe gives us access to a market that has shown considerable support for electrification. In addition, IHI invested $25.0 million in our common stock.

In February 2009, the U.S. government enacted the ARRA, which provides for $2 billion in grants under the DOE Battery Initiative to support the construction and capacity expansion of U.S. manufacturing plants to produce batteries and electric drive components for HEV, PHEV and EV vehicles. We were selected to receive a $249.1 million grant award under the DOE Battery Initiative to support our manufacturing expansion and in December 2009, we completed an agreement on the grant's terms and conditions. We are required to spend one dollar of our own funds for every incentive dollar we receive under the DOE Battery Initiative. We have incurred allowable costs entitling us to receive approximately $127.8 million in reimbursements which we have reported to DOE.

We have also applied for direct loans under the Department of Energy Advance Technology Vehicles Manufacturing Program or DOE ATVM Program, to support our manufacturing expansion. If awarded, we believe we will be permitted to borrow up to $233 million under the ATVM Program. We expect we will be required to spend one dollar of our own funds for every four dollars we borrow under the ATVM Program. The timing and the amount of any loan we may receive under the ATVM Program, as well as the specific terms and conditions applicable to any loan we may receive are currently not known by us, and, once disclosed to us, are subject to change and negotiation with the federal government.

The State of Michigan awarded us a $10.0 million grant as an incentive to establish a lithium-ion battery manufacturing plant. We received $3.0 million of the $10.0 million grant in March 2009 and $6.0 million in July 2010, with the remainder to be paid based on the achievement of certain milestones in our facility development. We have used $8.3 million of these funds and intend to continue to use these funds to support the expansion of our facilities in Livonia and Romulus, Michigan.

jobs we create over the benefit period. Depending on the period over which we are able to maintain the number of qualified jobs created, we may be required to repay 50% to 100% of the tax credit received. In November 2009, we entered into a Cell Manufacturing Credit agreement with MEGA pursuant to which we are eligible for a credit equal to 50% of our capital investment expenses commencing January 2009, up to a maximum of $100 million over a four-year period related to the construction of our integrated battery cell manufacturing plant. The tax credit shall not exceed $25.0 million per year beginning with the tax year of 2012. The tax credit may be claimed under the Michigan Business Tax, or MBT, Act which states that an election may be made on each year's MBT return where the credit is claimed, to either have the amount of the credit that exceeds the respective year's MBT liability to be refunded or carried forward for ten years. We are required to create 300 jobs no later than December 31, 2016 in order for the tax credit proceeds to be non-refundable. The tax credit is subject to a repayment provision in the event we relocate 51% or more of the 300 jobs outside of the State of Michigan within three years after the last year we received the tax credit. Through December 31, 2011, we have incurred expenses exceeding $200.0 million related to the construction of our Livonia and Romulus facilities. When we have met the filing requirements for the tax year ending December 31, 2012, we expect to receive approximately $100.0 million in proceeds related to these expenditures.

The State of Michigan has also offered us a low interest forgivable loan of up to $4.0 million effective August 2009 with the objective of conducting advance vehicle technology operations to promote and enhance job creation within the State of Michigan. To receive advances from the loan, we are required to achieve certain key milestones related to the development of our manufacturing facility. We received $4.0 million under this loan during the year ended December 31, 2011. We have no obligation to pay any principal or interest until August 2012. If we create 350 full time jobs by August 2012 and maintain the jobs in the State of Michigan for three years after the end of the loan, the entire debt will be forgiven.

In December 2009, the State of Michigan offered us a $2.0 million grant to develop and improve the quality of application of energy efficient technologies and to create or expand the market for such technologies. We are required to demonstrate a smart grid stabilization system combined with renewable power sources such as solar and wind that will help power our Livonia plant to produce the batteries that will electrify transportation and stabilize the grid. We have received $1.6 million of this grant and the remaining $0.4 million has been cancelled. In addition, we entered into an agreement with the City of Livonia which provides us a complete exemption from personal property taxes incurred in Livonia, on all new personal property during the exemption period commencing on December 31, 2009. The exemption will continue through December 31, 2023 provided we invest at least $24.0 million in personal property and create or locate 350 new jobs in the eligible district.

In May 2010, we entered into a Renaissance Zone Development agreement with the Michigan Strategic Fund and the property owners for the site we lease in Romulus, Michigan. We may receive exemptions, deductions, credits or other benefits if we invest a certain amount of capital and create a certain number of jobs related to the facility in Romulus, Michigan. As of December 2011, we have not yet met all the conditions to be eligible to receive the Renaissance Zone benefits.

In October 2010, we entered into a forgivable loan agreement with the Massachusetts Clean Energy Technology Center for $5.0 million for the purpose of funding working capital, capital expenses, and leasehold improvements for our new corporate headquarters and primary research and development center in Waltham, Massachusetts and Energy Solutions Group engineering and manufacturing facilities in Westborough, Massachusetts. Pursuant to the agreement, if we create 263 new jobs in Massachusetts between January 1, 2010 and December 31, 2014 and maintain at least 513 jobs in Massachusetts from January 1, 2015 to October 2017, $2.5 million of the outstanding

principal and accrued interest on the loan will be forgiven. If we spend, or commit to spend, at least $12.5 million in capital expenses or leasehold improvements by October 2011, $2.5 million of the outstanding principal and accrued interest on the loan will be forgiven. As of December 31, 2011, we have borrowed the full $5.0 million under this agreement, $2.5 million of which was forgiven as we have complied with the conditions related to the capital expenditure target. The remaining $2.5 million is recorded in long-term debt until we have reasonable assurance that we will comply with the conditions of the grant for the forgiveness related to the creation of new jobs in Massachusetts.

We have received awards from the Department of Energy's collaboration with the United States Advanced Battery Consortium, or USABC. In December 2006, we commenced the HEV battery development program with the USABC. This first program was a $15.0 million program, with a 50-50 cost share whereby the USABC provided us up to $7.5 million, designed to accelerate development of a high-performance, low cost HEV battery. This program was completed in 2010. The second program we commenced with USABC is a $12.5 million program, also with a 50-50 cost share, with a goal of developing high-energy, low cost PHEV batteries. Under this program, we are targeting the development of two different kinds of PHEV batteries, one with ten miles of electric equivalent range and the other with 40 miles of electric equivalent range. We received a no-cost extension to complete life testing on the PHEV program, with the final report expected to be submitted in the first half of 2012. In February 2011, we were awarded a new USABC program for $8.0 million, also with a 50-50 cost share, to improve upon high-power prismatic cells. As of December 31, 2011, we expect to receive $3.3 million in reimbursements under this program.

Our global supply chain and manufacturing infrastructure can produce millions of batteries and hundreds of metric tons of active materials per year. We measure our product shipments in watt hours, which is the energy capacity of a single battery for a single complete discharge.

Watt hours, or Wh, are the amp hour storage capacity of a battery multiplied by its voltage. The average battery voltage for our 26650 battery is 3.3 volts, or 3.3 V. We determine amp hour storage capacity at a specific discharge rate and a specific depth of discharge. We do this by charging the battery to its top voltage and discharging it to zero capacity (2 volt charge level). A battery's usable energy capacity is determined at the application level. For example, our 26650 battery has a nominal capacity of 2.3 Ah and operates at 3.3 V, resulting in 7.59 Wh.

As of December 31, 2011, we estimate that our annual manufacturing capacity was approximately 645.8 million watt hours.

We have over 840,000 square feet of manufacturing facilities worldwide where we produce or intend to produce our batteries, from raw powder to finished batteries and battery systems using both our facilities and third party contractors. Our manufacturing facilities are located in Livonia and Romulus, Michigan, Changzhou, China in an export processing zone, Zhenjiang, China, and at our facilities in Korea. Risks associated with our foreign operations are discussed in Item 1A of this Annual Report on Form 10-K under the heading Risks Associated with Doing Business Internationally and Specifically in China and Korea. We also have the capability to manufacture and assemble low volume, high value-add battery modules and systems at our energy solutions group facility in Westborough, Massachusetts.

We commenced commercial production of powder in the third quarter of 2005 and outsourced the coating and battery and battery system assembly. Initial battery production ramp-up commenced in the third quarter of 2005 and our first commercial batteries began shipping in February 2006. During 2007, we commenced construction of two additional plants for the expansion of powder production and new

coating production and signed a lease for a third plant for new battery assembly at our Changzhou location. We completed the qualification of these plants for full volume production in 2007. In 2009, we expanded the operations in Changzhou, China to include pack assembly operations.

While our concentration of manufacturing facilities has historically been in Asia, we expanded our domestic battery manufacturing capacity in 2010 by establishing vertically-integrated manufacturing plants in the United States that would perform all of the stages of the manufacture of batteries and battery systems. The first phase of this expansion took place in Livonia, Michigan, where during the third quarter of 2010, we opened our new manufacturing facility. In Livonia, we are producing prismatic cells and pack systems using the same processes and equipment we currently use in our Asian factories. We also entered into a lease in December 2009 for an additional facility in Romulus, Michigan, which we use for electrode coating. This facility qualified for production in October 2011. Our continued U.S. expansion depends upon the continued receipt of sufficient federal and state incentive funding and is intended to complement our existing manufacturing facilities in Asia. The goal of this expansion, which is occurring gradually and over several years, is to significantly improve specific operational output in powder, coating and cell and pack assembly.

The manufacturing of our batteries and systems requires several integrated stages: powder synthesis, cathode and anode coating, battery and battery system assembly. We continue to augment the degree of automation in each of these stages, transitioning from semi-automated production lines, to production lines with fully automated process bays and high volume equipment, where the only manual steps consist of loading and monitoring equipment and performing certain quality control processes.

Our manufacturing operations allow us to directly control product quality and minimize the risks associated with having to disclose proprietary technology to outside parties during production. In Asia, to further protect our intellectual property, we use separate manufacturing facilities for each phase of battery production. We control every stage in the manufacture of our products except for the final assembly of our 18650 batteries where we are producing this battery through partnerships with third-party suppliers rather than building our own production capacity.

Our powder, coating and assembly facilities incorporate environmental control and processing systems in a modular design geared for easy and rapid capacity expansion. To complete each new production line, we plan to use a systematic replication process designed to enable us to add production lines rapidly and efficiently and achieve operating metrics in new production environments that offer comparable performance to that of our current plants.

We also are seeking to lower our manufacturing costs and to improve our cost per Wh manufactured by refining processes and intermediate quality control to improve manufacturing yields, obtaining raw material and component volume discounts, consolidating sub-contractors, substituting certain raw materials, managing inventory and optimizing shipping costs. While our manufacturing philosophy is designed to achieve low cost in order to maintain sustainable competitive advantage, it is also focused on providing world class quality. We are compliant with ISO 9001:2000 certification and TS16949 certification.

An important consideration as we grow our revenue stream is to ensure that we have access to the various components and raw materials we need to manufacture and assemble our various products. As we plan larger orders, establishing multiple sources for key components is important to our operations.

We source our raw materials from many suppliers globally. Our goal is to use multiple sources for our raw materials and components. If we are not able to qualify multiple sources, we monitor our supplier scalability and capacity very closely.

As of December 31, 2011, we had 1,350 employees in manufacturing operations and supply chain.

We market and sell our products primarily through a direct sales force, consisting of individuals who have backgrounds in either electrical or mechanical engineering and who generally have experience selling batteries and battery systems into the specific market segments to which they are assigned. In November 2009, we created two focused business groups—one dedicated to the transportation market and the other to cell design and development—to best serve customers across all of our vertical markets. The business organizations are the Automotive Solutions Group and the Cell Products Group. These groups operate alongside the Energy Solutions Group, which serves electric grid and commercial markets. The Automotive Solutions Group is comprised of dedicated engineering and product development experts and sales and marketing professionals with extensive automotive experience and locations in Michigan, Massachusetts, Asia and Germany. In the transportation market, we are focusing sales of our batteries and battery systems to automotive manufacturers either directly or through tier 1 suppliers. We are working with automotive manufacturers directly to educate and inform them about the benefits of our technology for use in HEVs, PHEVs and EVs. At the same time, we are working with tier 1 suppliers who are developing integrated solutions using our batteries.

In the electric grid market, our initial sales have been made directly through our sales force. In the commercial market, our sales are made both directly and indirectly through distributors with key accounts managed by our sales personnel. We also have value added partners in the United States, Europe, and Asia who integrate our products into consumer applications. Our indirect channel sales are made primarily through these value-added distributors and sales representatives in North America, Europe and Asia which focus on non-major customer accounts.

Our direct sales force is based in the United States, Asia and Europe. We are expanding our sales presence in the United States and Europe and are seeking to expand our presence in Asia as our business in those regions continues to develop. We expect international markets to provide increased opportunities for our products.

We have entered into strategic relationships with business partners based in Europe, China and Japan who have complementary technologies for, and experience in, the transportation, electric grid and other markets and we may enter into strategic relationships with business partners based in other countries. We entered into a joint marketing agreement with IHI Corporation in October 2009 to assess market opportunities in Japan and to serve potential customers in the Japanese transportation, industrial and marine markets. We then expanded the relationship in November 2011 to include a license to our battery system technology to develop solutions for the Japanese market.

We believe that forming strategic relationships may help to achieve cost economies in product development and manufacturing, provide us with the ability to take advantage of any available local government stimulus funding and related incentives, result in optimized products and provide advantages in marketing and selling our products in the geographic markets where our partners are based.

Our sales cycles vary by market segment and typically follow a lengthy development and qualification period prior to commercial production. We expect that the total time from customer introduction to commercial production may range up to five years depending on the specific product and market served. For example, total time in the transportation market includes a customer's preliminary technology review which generally ranges from three to twelve months and product development which generally ranges from twelve to eighteen months. In the electric grid services market, time to production includes a customer's preliminary technical assessment which typically takes three to six months, followed by an additional six to twelve months of permitting the utility interconnection process. In the grid market, we have developed a flexible product architecture that allows various sized products to be manufactured, shipped and installed within six to twelve months. In the commercial market, the time from introduction to commercial production can take up to three years or more, depending on the customer and complexity.

We focus our marketing efforts on increasing brand awareness, communicating product advantages and generating qualified leads for our sales force and channel partners. We rely on a variety of marketing vehicles, including participation in industry conferences and trade shows, to share our technical message with customers, as well as public relations, industry research and our collaborative relationships with our strategic investors and business partners.

Our research, development and engineering efforts are focused on developing new products and continuously improving the performance of existing products. We design our products for performance metrics such as energy density (the amount of energy per volume of the battery), specific energy (the amount of energy per mass of the battery), power density (the amount of power per volume of the battery) and specific power (the amount of power per mass of the battery), cycle life, calendar life and numerous safety and abuse-tolerance metrics. We focus our research and development efforts on the following areas:

We believe that our ability to deliver higher performance batteries and battery systems depends upon the rapid and effective transfer of the technology developed in our research and development laboratories into high volume manufacturing. Therefore, we maintain pilot plant capabilities and we reserve a portion of our production capacity for structured experiments related to manufacturing process development.

As of December 31, 2011, we had 373 research and development employees worldwide. Research, development and engineering expenses totaled $48.3 million in 2009, $60.7 million in 2010 and $76.9 million in 2011.

An important part of our overall research activities are our relationships with universities and national laboratories. We maintain active collaborations with the Massachusetts Institute of Technology relating to electrode materials for batteries used in transportation applications, the University of Michigan relating to the development of manufacturing technology designed to support transportation applications, Michigan State University relating to the development of materials technology designed to support next generation battery cell products, and several U.S. Department of Energy laboratories, including Lawrence Berkeley National Laboratory relating to investigating the life of lithium-ion batteries, Argonne National Laboratory and Sandia National Laboratory relating to validating cell performance and abuse test results conducted for USABC in transportation applications and the National Renewable Energy Laboratory relating to validating thermal cell testing activity and module level thermal modeling. Some of these collaborations take place under the auspices of the USABC, which is comprised of Chrysler, Ford and GM. For the year ended December 31, 2011, we invested $83.3 million into our research and development activities of which we have been reimbursed through government contracts for $6.3 million. We also received $7.3 million of services revenue from U.S. government agencies for research and development services for the year ended December 31, 2011.

Competition in the battery industry is intense and rapidly evolving. Our markets are subject to changing technology trends, shifting customer needs and expectations and frequent introduction of new technologies. We believe the primary competitive factors in our markets are:

We face competition from joint venture companies in our industry. For example, in 2008, Bosch and Samsung formed LiMotive to focus on the development, production and marketing of lithium-ion battery systems for use in HEVs and other electric vehicles. Dow Chemical established a joint venture with Kokam America and others, to build a facility in Michigan for the manufacture of lithium polymer batteries for use in HEVs and other electric vehicles.

In the rechargeable battery market, the principal competitive technologies currently marketed are lead-acid, nickel-cadmium, nickel metal hydride and lithium-ion batteries. Our primary competitors who have announced the availability of either lithium-ion or other competing rechargeable battery products include Panasonic, Sanyo, BYD, LG, Lithium Energy Japan (Mitsubishi-GS Yuasa), Blue Energy Company (Honda-GS Yuasa), and SB LiMotive (Samsung-Bosch) among others.

Within each of our target markets, we encounter the organizations named above as well as other competitors:

Many of our competitors have greater market presence, longer operating histories, stronger name recognition, larger customer bases and significantly greater financial, technical, sales and marketing, manufacturing and other resources than we have. Moreover, if one or more of our competitors were to merge or partner with another of our competitors, the change in the competitive landscape could adversely affect our customer relationships and competitive position or otherwise affect our ability to compete effectively.

Our success depends in part upon our ability to obtain and maintain proprietary protection for our products, technology and know-how, to operate without infringing the proprietary rights of others and to prevent others from infringing our proprietary rights. Our policy is to seek to protect our proprietary position by, among other methods, filing United States and foreign patent applications related to our proprietary technology, inventions and improvements that are important to the development and conduct of our business. We also rely on trademarks, trade secrets, know-how, continuing technological innovation and in-licensing opportunities to develop and maintain our proprietary position.

On October 31, 2011, A123 Systems, Hydro Québec, and the Board of Regents of the University of Texas System, on behalf of the University of Texas at Austin (UT) settled their patent disputes

regarding lithium metal phosphate technologies. The Settlement Agreement and related Patent Sublicense Agreement resolved the existing litigations and created a cross-license going forward.

As of December 31, 2011, we owned or exclusively licensed a total of 38 United States patents, with 85 United States pending patent applications and 37 foreign issued patents, with 250 pending foreign patent applications. Our United States patents and foreign issued patents will expire between 2016 and 2023.

The patent positions of companies like ours are generally uncertain and involve complex legal and factual questions. Our ability to maintain and solidify our proprietary position for our technology will depend on our success in obtaining effective patent claims and enforcing those claims once granted. We do not know whether any of our patent applications or those patent applications that we license will result in the issuance of any patents. Our issued patents and those that may issue in the future, or those licensed to us, may be challenged, invalidated or circumvented, which could limit our ability to stop competitors from marketing related products or shorten the term of patent protection that we may have for our products. In addition, the rights granted under any issued patents may not provide us with competitive advantages against competitors with similar technology. Furthermore, our competitors may independently develop similar technologies or duplicate any technology developed by us. Because of the extensive time required for development, testing and regulatory review of a potential product, it is possible that, before any of our products under development can be commercialized, any related patent may expire or remain in force for only a short period following commercialization, thereby reducing any advantage of the patent.

We rely, in some circumstances, on trade secrets to protect our technology. Trade secrets, however, are difficult to protect. We seek to protect our proprietary technology and processes, in part, by confidentiality agreements with our employees, consultants, scientific advisors and other contractors. These agreements may be breached, and we may not have adequate remedies for any breach. In addition, our trade secrets may otherwise become known or be independently discovered by competitors. To the extent that our employees, consultants or contractors use intellectual property owned by others in their work for us, disputes may arise as to the rights in related or resulting know-how and inventions.

We use trademarks on some of our products and believe that having distinctive marks may be an important factor in marketing our products. We have registered our A123® and A123 Systems® marks in the United States and internationally. Our other trademarks include the A123 Systems logo and the term, Nanophosphate®. We have also registered some of our marks in a number of foreign countries. Although we have a foreign trademark registration program for selected marks, we may not be able to register or use such marks in each foreign country in which we seek registration.

We often enter into research and development arrangements with the federal government or other government agencies that require us to provide pure research, in which we investigate design techniques on new battery technologies. Generally, our research and development arrangements provide that all pre-existing or newly created intellectual property remains under the ownership of the respective party, and that all jointly-created intellectual property be owned by both parties without a duty to account for or pay royalties to the other party.

With respect to the research and development awards we have received to date from the USABC for HEV and PHEV battery development, our contracts provide that we own all intellectual property rights we acquire or develop during our research and development activities so long as we agree to contribute at least a 50% share of the total program costs under each program's 50-50 cost share arrangement. If we do not make our 50% cost share contribution, then we are required to grant the USABC a nonexclusive, fully paid, worldwide, irrevocable license to our intellectual property rights to any application of the relevant technology, under reasonable terms and conditions.

As of December 31, 2011, we had 1,983 full-time employees, with 373 in research and development, 1,350 in manufacturing operations/supply chain, 66 in sales and marketing and 194 in general and administration.

Of our full-time employees, 955 are located in the United States and 1,028 are abroad. We consider our current relationship with our employees to be good.

None of our employees are represented by labor unions or have collective bargaining agreements, except for certain employees in our Changzhou, China facilities who established a Labor Union Commission in 2007.

We have determined that we have one operating segment. For more information about our segments, and for financial information about geographic areas, see Note 2 to our consolidated financial statements in this Annual Report on the Form 10-K under the heading Summary of Significant Accounting Policies—Segment, Geographic and Significant Customer Information.

Our annual reports on Form 10-K, quarterly reports on Form 10-Q, periodic reports on Form 8-K and amendments thereto are available to the public, free of charge, on our website, www.a123systems.com, as soon as reasonably practicable after they have been filed with the Securities and Exchange Commission, or SEC, and through the SEC's website, www.sec.gov. We are not including the information contained on our website as part of, or incorporating it by reference into, this Annual Report on Form 10-K.

Our business is subject to numerous risks, including those discussed below. We caution you that the following important factors, among others, could cause our actual results to differ materially from those described in this Annual Report and expressed in forward-looking statements made by us or on our behalf in filings with the SEC, press releases, communications with investors and oral statements. Any or all of our forward-looking statements in this Annual Report on Form 10-K and in any other public statements we make may turn out to be wrong. They can be affected by inaccurate assumptions we might make or by known or unknown risks and uncertainties. We refer you to the section above entitled "Note About Forward Looking Statements," which identified forward-looking statements in this report. We undertake no obligation to update any forward-looking statements, whether as a result of new information, future events or otherwise.

We have had a history of losses, and we may be unable to achieve or sustain profitability.

We have never been profitable. We experienced net losses of $85.8 million for 2009, $152.6 million for 2010 and $257.7 million for 2011. We expect we will continue to incur net losses in the near term. We expect to incur significant future expenses as we develop and expand our business and our manufacturing capacity. These increased expenditures will make it harder for us to achieve and maintain future profitability. We may incur significant losses in the future for a number of reasons, including the other risks described in this section, and we may encounter unforeseen expenses, difficulties, complications, delays and other unknown events. Accordingly, we may not be able to achieve or maintain profitability.

We have yet to achieve positive cash flow, and our ability to generate positive cash flow is uncertain.

To rapidly develop and expand our business, we have made significant up-front investments in our manufacturing capacity and incurred research and development, sales and marketing and general and administrative expenses. In addition, our growth has required a significant investment in working capital over the last several years. We have had negative cash flow before financing activities of $114.7 million for 2009, $250.4 million for 2010 and $333.8 million for 2011. We anticipate that we will continue to have negative cash flow for the foreseeable future. Our business will also require significant amounts of working capital to support our growth. Therefore, we may need to raise additional capital from investors to achieve our expected growth, and we may not achieve sufficient revenue growth to generate positive future cash flow. An inability to generate positive cash flow for the foreseeable future or raise additional capital on reasonable terms may decrease our long-term viability.

Our failure to raise additional capital necessary to expand our operations and invest in our products and manufacturing facilities could reduce our ability to compete successfully.

We may need to raise additional capital in the future to fund our growth and expansion plans and we may not be able to obtain additional debt or equity financing on favorable terms, if at all. If we raise additional equity financing, our stockholders may experience significant dilution of their ownership interests, and the per-share value of our common stock could decline. For example, in April, 2011, we issued 20.2 million shares of common stock and $143.8 million in principal of convertible unsecured subordinated notes. In addition, in November, 2011, we raised $25.0 million through the sale of common stock to IHI and in January 2012, we raised $25.4 million through the issuance of 12,500,000 shares of our common stock in a registered direct offering, or RDO. Pursuant to the RDO, we will have the option, subject to certain conditions, to require the purchase of up to an additional 6,250,000 shares of our common stock during each of two exercise periods in June and July of 2012. If such conditions are not able to be satisfied during each option period, we will not be able to require the investor to purchase the additional shares and we will receive no proceeds therefrom.

The issuance of shares pursuant to these transactions resulted in dilution to stockholders who held our common stock prior to such transactions. Stockholders will also experience further dilution if holders of the convertible notes choose to convert outstanding notes into shares of our common stock or if we exercise our right to cause the investor in our RDO to purchase up to an additional 12,500,000 shares of our common stock.

If we engage in debt financing, we may be required to accept terms that restrict our ability to incur additional indebtedness and force us to maintain specified liquidity or other ratios. We are also seeking federal and state grants, loans and tax incentives some of which we intend to use to expand our operations. We may not be successful in obtaining these funds or incentives. If we need additional capital and cannot raise or otherwise obtain it on acceptable terms, we may not be able to, among other things:

Our limited operating history makes it difficult to evaluate our current business and future prospects.

We have been in existence since 2001, but much of our growth has occurred in recent years. Our limited operating history may make it difficult to evaluate our current business and our future prospects. We have encountered and will continue to encounter risks and difficulties frequently experienced by growing companies in rapidly changing industries, including increasing expenses as we continue to grow our business. If we do not manage these risks successfully, our business will be harmed.

In addition, we are targeting new and emerging markets for our batteries and battery systems. However, historically, a significant portion of the products that we have sold for commercial use were designed for the consumer tool market, which is a more mature market with different growth prospects than our other target markets. Several of our products are still under development, and the timing of the ultimate release, if any, of new production quality products is not determinable. Our efforts to expand beyond our existing markets may never result in new products that achieve market acceptance, create additional revenue or become profitable. Therefore, our recent historical growth trajectory may not provide an accurate representation of the market dynamics we may be exposed to in the future, making it difficult to evaluate our future prospects.

The demand for batteries in the transportation and other markets depends on the continuation of current trends resulting from dependence on fossil fuels. Extended periods of low gasoline prices could adversely affect demand for electric and hybrid electric vehicles.

We believe that much of the present and projected demand for advanced batteries in the transportation and other markets results from increases in the cost of oil over the last several years, the dependency of the United States on oil from unstable or hostile countries, government regulations and economic incentives promoting fuel efficiency and alternate forms of energy, as well as the belief that climate change results in part from the burning of fossil fuels. If the cost of oil decreased significantly, the outlook for the long-term supply of oil to the United States improved, the government eliminated or modified its regulations or economic incentives related to fuel efficiency and alternate forms of energy, or if there is a change in the perception that the burning of fossil fuels negatively impacts the environment, the demand for our batteries could be reduced, and our business and revenue may be harmed.

Gasoline prices have been extremely volatile, and this continuing volatility is expected to persist. Lower gasoline prices over extended periods of time may lower the perception in government and the private sector that cheaper, more readily available energy alternatives should be developed and produced. If gasoline prices remain at deflated levels for extended periods of time, the demand for hybrid and electric vehicles may decrease, which would have a material adverse effect on our business.

If we are unable to develop, manufacture and market products that improve upon existing battery technology and gain market acceptance, our business may be adversely affected. In addition, many factors outside of our control may affect the demand for our batteries and battery systems.

We are researching, developing, manufacturing and selling lithium-ion batteries and battery systems. The market for advanced rechargeable batteries is at a relatively early stage of development, and the extent to which our lithium-ion batteries will be able to meet our customers' requirements and achieve significant market acceptance is uncertain. Rapid and ongoing changes in technology and product standards could quickly render our products less competitive, or even obsolete if we fail to continue to improve the performance of our battery chemistry and systems. Other companies that are seeking to enhance traditional battery technologies have recently introduced or are developing batteries based on nickel metal-hydride, liquid lithium-ion and other emerging and potential technologies. These

competitors are engaged in significant development work on these various battery systems. One or more new, higher energy rechargeable battery technologies could be introduced which could be directly competitive with, or superior to, our technology. The capabilities of many of these competing technologies have improved over the past several years. Competing technologies that outperform our batteries could be developed and successfully introduced, and as a result, our products may not compete effectively in our target markets. If our battery technology is not adopted by our customers, or if our battery technology does not meet industry requirements for power and energy storage capacity in an efficient and safe design, our batteries will not gain market acceptance.

In addition, the market for our products depends upon third parties creating or expanding markets for their end-user products that utilize our batteries and battery systems. If such end-user products are not developed, if we are unable to have our products designed into these end user products, if the cost of these end-user products is too high, or the market for such end-user products contracts or fails to develop, the market for our batteries and battery systems would be expected similarly to contract or collapse. Our customers operate in extremely competitive industries, and competition to supply their needs focuses on delivering sufficient power and capacity in a cost, size and weight efficient package. The ability of our customers to adopt new battery technologies will depend on many factors outside of our control. For example, in the automotive industry, we depend on our customers' ability to develop HEV, PHEV and EV platforms that gain broad appeal among end users.

Many other factors outside of our control may also affect the demand for our batteries and battery systems and the viability of widespread adoption of advanced battery applications, including:

Our principal competitors have, and any future competitors may have, greater financial and marketing resources than we do, and they may therefore develop batteries or other technologies similar or superior to ours or otherwise compete more successfully than we do.

Competition in the battery industry is intense. The industry consists of major domestic and international companies, most of which have existing relationships in the markets into which we sell as well as financial, technical, marketing, sales, manufacturing, scaling capacity, distribution and other resources and name recognition substantially greater than ours. These companies may develop batteries or other technologies that perform as well as or better than our batteries. We believe that our primary competitors are existing suppliers of lithium-ion, nickel cadmium, nickel metal-hydride and in some cases, non-starting/lighting/ignition lead-acid batteries. A number of our competitors have existing and evolving relationships with our target customers. In the transportation space for example, Bosch and Samsung formed SB LiMotive to focus on the development, production and marketing of lithium-ion battery systems for application in hybrid and other electric vehicles, and Dow Chemical has entered into a joint venture with Kokam America and others, to build a facility in Michigan for the manufacture of lithium polymer batteries for use in HEVs and EVs. In addition, NEC Corporation and Nissan entered into a joint venture to develop lithium-ion batteries in prismatic form, Sanyo and Volkswagen agreed to develop lithium-ion batteries for HEVs, Sanyo is providing nickel metal hydride batteries for Ford and Honda, and Toyota and Panasonic are engaged in a joint venture to make batteries for HEVs and EVs. LG Chem and its subsidiary, Compact Power, have also developed lithium-ion battery systems for hybrid and other electric vehicles. In the electric grid space for example, Saft and Xtreme Power have developed applications for grid energy storage.

These competitors may be able to offer lower prices for their batteries than we can offer, and may even sell their batteries at below their production costs in order to compete with us, particularly in the transportation market. In addition, we expect new competitors will enter the markets for our products in the future with a continued emergence of Chinese companies entering the lithium-ion space, along with existing Chinese battery companies, including Amperex Technology Limited (ATL), BAK Battery and BYD. Potential customers may choose to do business with our more established competitors, because of their perception that our competitors are more stable, are more likely to complete various projects, can scale operations more quickly, have greater manufacturing capacity, are more likely to continue as a going concern and lend greater credibility to any joint venture. If we are unable to compete successfully against manufacturers of other batteries or technologies in any of our targeted applications, our business could suffer, and we could lose or be unable to gain market share.

Adverse business or financial conditions affecting the automobile industry have had, and may continue to have, a material adverse effect on our development and marketing partners and our battery business.

Much of our business depends on and is directly affected by the general economic state of the United States and global automobile industry. The effect of the continued economic difficulties of the major automobile manufacturers on our business is unclear. The impact of any such financial difficulties on the automobile industry and its suppliers is difficult to predict. Possible effects could include reduced spending on alternative energy systems for automobiles, a delay in the introduction of new, or the cancellation of new and existing, hybrid and electric vehicles and programs, and a delay in the conversion of existing batteries to lithium-ion batteries, each of which would have a material adverse effect on our business.

We have entered into agreements relating to joint design and development efforts with several automotive manufacturers and tier 1 suppliers regarding their HEV, PHEV and EV development efforts. Certain of these manufacturers and suppliers have in recent years experienced static or reduced revenues, increased costs, net losses, loss of market share, bankruptcy, production issues, labor issues and other business and financial challenges. As a result, these or other automotive manufacturers may discontinue or delay their planned introduction of HEVs, PHEVs or EVs as a result of adverse changes

in their financial condition or other factors. Automotive manufacturers may also seek alternative battery systems from other suppliers which may be more cost-effective or require fewer modifications in standard manufacturing processes than our products. We may also experience delays or losses with respect to the collection of payments due from customers in the automotive industry experiencing financial difficulties or reductions in forecasted demand.

We have experienced rapid growth in recent periods. If we fail to manage our growth effectively, we may be unable to execute our business plan, maintain high levels of service or address competitive challenges adequately.

We increased our number of full-time employees from 904 at January 1, 2008 to 1,983 at December 31, 2011, and our revenue increased from $68.5 million in 2008 to $159.1 million in 2011. Our growth has placed, and may continue to place, a significant strain on our managerial, administrative, operational, financial, legal, information technology and other resources. Expanding a global organization and managing a geographically dispersed workforce will require substantial management effort and significant additional investment in our infrastructure. We will be required to continue to improve our operational, financial and management controls and our reporting procedures and we may not be able to do so effectively. As such, we may be unable to manage our expenses effectively in the future, which may negatively impact our operating results in any particular quarter.

Because we build our manufacturing capacity based on our projection of future design wins and supply agreements, our business revenue and profits depend upon our ability to enter into and complete these agreements, successfully complete these expansion projects, achieve competitive manufacturing yields and drive volume sales consistent with our demand expectations.

In order to fulfill the anticipated demand for our products, we invest in capital expenditures in advance of actual customer orders, based on estimates of future demand. We plan to continue the expansion of our manufacturing capacity across multiple product lines based on such estimates. The build-up of our internal manufacturing capabilities, such as the current expansions in Livonia and Romulus, Michigan, exposes us to significant up-front fixed costs. If market demand for our products does not increase as quickly as we have anticipated and align with our expanded manufacturing capacity, if customers' forecasts of expected demand are reduced or if we fail to enter into and complete projected development and supply agreements, we may be unable to offset these costs and to achieve economies of scale, and our operating results may be adversely affected as a result of high operating expenses, reduced margins, underutilization of capacity and asset impairment charges. Alternatively, if we experience demand for our products in excess of our estimates, our installed capital equipment may be insufficient to support higher production volumes, which could harm our customer relationships and overall reputation. In addition, we may not be able to expand our workforce and operations in a timely manner, procure adequate resources, or locate suitable third-party suppliers, to respond effectively to changes in demand for our existing products or to the demand for new products requested by our customers, and our current or future business could be materially and adversely affected. Our ability to meet such excess customer demand could also depend on our ability to raise additional capital and effectively scale our manufacturing operations.

We utilize standard manufacturing equipment that we modify and customize in order to meet our production needs. While this equipment may be available from various suppliers, its procurement requires long lead times. Therefore, we may experience delays, additional or unexpected costs and other adverse events in connection with our capacity expansion projects, including those associated with potential delays in the procurement and customization of manufacturing equipment and various components required for our products.

If we are unable to achieve and maintain satisfactory production yields and quality as we expand our manufacturing capabilities, our relationships with certain customers and overall reputation may be harmed, and our sales could decrease and our margins could be negatively impacted.

Revenue from our supply agreement with Fisker Automotive, Inc., or Fisker, represents, and is expected to continue to represent, a significant portion of our revenue. If Fisker is unable to fulfill its commitment under the supply agreement our revenues could be materially lower than our forecasts and we may have under-utilized manufacturing capacity.

We have a supply agreement with Fisker pursuant to which we are providing Fisker with advanced automotive battery systems over a multi-year period. Fisker accounted for approximately 2% of our revenue in 2010 and 26% of our revenue in 2011. If Fisker is not successful in raising additional capital necessary to fund its operations, executing on its strategic plan or does not meet the anticipated demand for our products, our revenues and profitability will be materially impacted. For example, in November 2011 and again in January, 2012, we announced revised annual revenue guidance for 2011 due to an unanticipated reduction in orders from Fisker. As we invest in capital expenditures and build our manufacturing capacity in anticipation of demand, including anticipated demand from Fisker under the supply agreement, our operating results may be adversely affected by underutilization of capacity, failure to achieve economies of scale, and reduced margins if actual orders are less than expected.

We may not be able to obtain, or to agree on acceptable terms and conditions for, all or a significant portion of the government grants, loans and other incentives for which we have applied and may in the future apply. Our customers and potential customers applying for government grants, loans and other incentives may condition purchases of our products upon their receipt of these funds or delay purchases of our products until their receipt of these funds.

We have applied for federal and state grants, loans and tax incentives under government programs designed to stimulate the economy and support the production of electric vehicles and advanced battery technologies, including a loan under the DOE ATVM Program. Much of our planned domestic manufacturing capacity expansion depends on receipt of these funds and other incentives, and the failure to obtain these funds or other incentives could materially and adversely affect our ability to expand our manufacturing capacity and meet planned production levels. Given recent bankruptcies declared by some recipients of loans under DOE-sponsored loan programs and resulting congressional and executive branch investigations, we anticipate that pending loan applications under the DOE ATVM Program, including our own, may be further delayed. It is also possible that the DOE ATVM Program may lose its funding as a result of budgetary cutbacks or that our application may not be approved if lending standards change. We anticipate that in the future there will be new opportunities for us to apply for grants, loans and other incentives from the United States, state and foreign governments. Our ability to obtain funds or incentives from government sources is subject to the availability and continued availability of funds under applicable government programs and approval of our applications to participate in such programs. The application process for these funds and other incentives is and will be highly competitive. While we have received a grant under the DOE Battery Initiative and have received some state incentives, we cannot assure you that we will be successful in obtaining additional grants, loans and other incentives. Moreover, we may not be able to satisfy or continue to satisfy the requirements and milestones imposed by the granting authority as conditions to receipt of the funds or other incentives, the timing of the receipt of the funds may not meet our needs and we nevertheless may be unable to successfully execute on our business plan. Moreover, not all of the terms and conditions associated with these incentive funds have been disclosed to us, and once disclosed, there may be terms and conditions with which we are unable to comply or which are commercially unacceptable to us. In addition, the DOE Battery initiative grant and any other federal government programs which may make additional awards to us will require us to spend a portion of our own funds for every incentive dollar we receive or are permitted to borrow from the government

and will impose time limits during which we must use the funds awarded to us. If we are unable to raise sufficient additional capital so that we are able to receive all of the amounts which have and may be awarded to us in a timely manner, our ability to expand our manufacturing capacity could be materially adversely affected. In addition, less than expected actual and anticipated future demand for our products may cause us to slow the pace of the expansion of our manufacturing capacity such that we are not able to use the government incentive funds awarded or made available to us in the time periods required by the granting authorities.

Our customers and potential customers applying for these government grants, loans and other incentives may condition purchases of our products upon receipt of these funds or delay purchases of our products until receipt of these funds, and if our customers and potential customers do not receive these funds or the receipt of these funds is significantly delayed, our results of operations could suffer.

We are subject to government audits related to the government grants, loans and other incentives we have received. If the findings of the audit determine we have not met the requirements of the grant, loan or other incentive, we may be required to repay all or part of the amount received to the government authority.

We have received funds under federal and state grant and loan programs. Under the terms and conditions of the programs, we are subject to governmental audits of the amounts submitted for reimbursement of costs incurred. Although we expect to satisfy the requirements of the grants, loans, and other incentives received, we cannot assure that the government audits will not result in determining that a portion of the costs submitted for reimbursement do not comply with the conditions of the grant. If we do not meet the conditions of the grants, loans or other incentives, we may be required to repay all or a portion of the proceeds received to date from the federal or state agencies.

We rely on a limited number of customers for a significant portion of our revenue, and the loss of, or delay in the production process, of one or more of our most significant customers, or several of our smaller customers, could materially harm our business.

A significant portion of our revenue is generated from a limited number of customers. For the year ended December 31, 2010, revenue from our two largest customers, AES and BAE Systems represented 41% of our revenue. For the year ended December 31, 2011, revenue from our two largest customers, Fisker and AES, represented 50% of our revenue. Although the composition of our significant customers will vary from period to period, we expect that most of our revenue will continue, for the foreseeable future, to come from a relatively small number of customers. In addition, our contracts with our customers generally do not include long-term commitments or minimum volumes that ensure future sales of our products. Consequently, our financial results may fluctuate significantly from period-to-period based on the actions of one or more significant customers. A customer may take actions that affect us for reasons that we cannot anticipate or control, such as reasons related to the customer's financial condition, changes in the customer's business strategy or operations, the introduction of alternative competing products, or as the result of the perceived quality or cost-effectiveness of our products. Our agreements with these customers may be cancelled if we fail to meet certain product specifications or materially breach the agreement or for other reasons outside of our control. In addition, our customers may seek to renegotiate the terms of current agreements or renewals. The loss of or a reduction in sales or anticipated sales to our most significant or several of our smaller customers could have a material adverse effect on our business, financial condition and results of operations. For example, in November 2011 and again in January 2012, we announced revised annual revenue guidance for 2011 due to an unanticipated reduction in orders from Fisker for the fourth quarter. Additionally, if one of our significant customers, several of our smaller customers, or one of our existing supply agreements with customers for significant future revenues experiences a delay in production, reduce their forecasted demand or their product is not successful, our business, financial condition and results of operations could be materially harmed.

Our financial results may vary significantly from period-to-period due to the long and unpredictable sales cycles for some of our products, the seasonality of certain end markets into which we sell our products, and changes in the mix of products we sell during a period, which may lead to volatility in our stock price.

The size and timing of our revenue from sales to our customers is difficult to predict and is market dependent. Our sales efforts often require us to educate our customers about the use and benefits of our products, including their technical and performance characteristics. Customers typically undertake a significant evaluation process that has in the past resulted in a lengthy sales cycle, which is typically many months and in some cases up to five years. In some markets such as the transportation market, there is usually a significant lag time between the design phase and commercial production. We spend substantial amounts of time and money on our sales efforts and there is no assurance that these investments will produce any sales within expected time frames or at all. For example, we have previously spent substantial time and money on several designs with auto manufacturers that were ultimately awarded to another supplier. Given the potentially large size of battery development and supply contracts, the loss of or delay in the signing of a contract or a customer order could significantly reduce our revenue in any period. Since most of our operating and capital expenses are incurred based on the estimated number of design wins and their timing, they are difficult to adjust in the short term. As a result, if our revenue falls below our expectations or is delayed in any period, we may not be able to reduce proportionately our operating expenses or manufacturing costs for that period, and any reduction of manufacturing capacity could have long-term implications on our ability to accommodate future demand.

Our profitability from period-to-period may also vary significantly due to the mix of products that we sell in different periods. While we have sold most of our products, in recent periods, into the transportation market, we are also focusing our sales efforts on applications in the electric grid and commercial markets. Products in these other markets have different cost profiles and are governed by different business dynamics. Further, our contracts in the electric grid market are project-driven; therefore, revenue tends to vary across periods. Consequently, sales of individual products may not necessarily be consistent across periods, which could affect product mix and cause gross and operating profits to vary significantly.

In addition, since our batteries and battery systems are incorporated into our customers' products for sale into their respective end markets, our business is exposed to the seasonal demand that may characterize some of our customers' own product sales. Because many of our expenses are based on anticipated levels of annual revenue, our business and operating results could also suffer if we do not achieve revenue consistent with our expectations for this seasonal demand.

As a result of these factors, we believe that quarter-to-quarter comparisons of our operating results are not necessarily meaningful and that these comparisons cannot be relied upon as indicators of future performance. Moreover, our operating results may not meet expectations of equity research analysts or investors. If this occurs, the trading price of our common stock could fall substantially either suddenly or over time.

As of December 31, 2011, we had total indebtedness of $182.9 million. Our indebtedness could have significant negative consequences, including:

We may not be able to generate sufficient cash to service all of our indebtedness, including the convertible notes. Our ability to generate cash depends on many factors beyond our control. We may be forced to take other actions to satisfy our obligations under our indebtedness, which may not be successful.

Our ability to make payments on, and to refinance, our indebtedness, including the convertible notes, and to fund planned capital expenditures, research and development efforts, working capital, acquisitions and other general corporate purposes depends on our ability to generate cash in the future. This, to a certain extent, is subject to general economic, financial, competitive, legislative, regulatory and other factors, some of which are beyond our control. If we do not generate sufficient cash flow from operations or if future borrowings are not available to us in an amount sufficient to pay our indebtedness, including the convertible notes, or to fund our liquidity needs, we may be forced to:

In addition, we may not be able to affect any of these actions on commercially reasonable terms or at all. Our ability to refinance this indebtedness will depend on our financial condition at the time, the restrictions in the instruments governing our indebtedness and other factors, including market conditions.

Our inability to generate sufficient cash flow to satisfy our debt service obligations, or to refinance or restructure our obligations on commercially reasonable terms or at all, would have an adverse effect, which could be material, on our business, financial condition and results of operations, as well as our ability to satisfy our obligations in respect of the convertible notes.

Our credit agreement contains restrictions that limit our flexibility in operating our business.

In September 2011, we entered into a credit agreement and refinanced our existing credit facility. Our credit agreement contain various financial and operating covenants that limit our ability to engage in specified types of transactions. The financial covenants require that we maintain certain liquidity ratios and tangible net worth. The operating covenants limit our ability to, among other things:

A breach of any of these covenants or a material adverse change to our business could result in a default under the credit agreement. Upon the occurrence of an event of default under our credit

agreement, our lenders could elect to declare all amounts outstanding to be immediately due and payable and terminate all commitments to extend further credit. If we were unable to repay those amounts, the lenders could proceed against the collateral granted to them to secure such indebtedness.

If our products fail to perform as expected, or have technical issues, we could lose existing and future business, have costly field campaigns, and our ability to develop, market and sell our batteries and battery systems could be harmed.

Our products are complex and could have unknown defects or errors, which may give rise to claims against us, diminish our brand or divert our resources from other purposes. Despite testing, new and existing products have contained defects and errors and may in the future contain manufacturing or design defects, errors or performance problems when first introduced, when new versions or enhancements are released, or even after these products have been used by our customers for a period of time. These problems could result in expensive and time-consuming design modifications or warranty charges, product recalls and field repair campaigns, delays in the introduction of new products or enhancements, significant increases in our service and maintenance costs, exposure to liability for damages, damaged customer relationships and harm to our reputation, any of which may adversely affect our business and our operating results. For example, in 2010, we identified several significant technical issues in the manufacturing scale-up of our prismatic batteries. Although we identified and have taken corrective actions for these issues, the problems encountered resulted in a higher yield loss in ramp-up production, temporary halts in the production process and the distraction of personnel, some or all of which could re-occur. In addition, in October 2011, we were notified by BAE of the existence of cumulative failures of the modules within our battery pack. We identified the problem as being related to water and debris intrusion. We are currently participating in a field campaign in order to retrofit and upgrade the packs to reduce water and debris intrusion and preserve the performance and safety of the pack. In addition, in December 2011, we determined that some of the battery packs we produce for Fisker could have a potential safety issue relating to the battery cooling system due to the misalignment of certain hose clamps in the battery pack's internal cooling system. While there were no related battery performance or safety incidents with cars in the field and corrective actions were promptly undertaken, the problem required unanticipated management time and expense as well as the rapid re-deployment of technical personnel to the field.

Our success in the transportation market depends, in part, on our ability to design, develop and commercially manufacture lithium-ion batteries in prismatic form and battery systems for use in HEVs, PHEVs and EVs currently being developed and that may be developed in the future. The design and development of a lithium-ion battery in prismatic form and battery systems for use in the transportation industry is complex, expensive, time-consuming and subject to rigorous quality and performance requirements. If we are unable to design, develop and commercially manufacture lithium-ion batteries in prismatic form in a timely fashion and that are accepted for use in the transportation industry, our business and operating results may be adversely affected.

We entered into a strategic investment agreement with an early stage entity with which we have a commercial relationship.

In January 2010, we entered into an agreement with Fisker, a privately-held company, to invest $13.0 million in cash and 479,282 shares of our common stock, which when transferred to Fisker had a value of approximately $7.5 million. In exchange, we received shares of convertible preferred stock in Fisker which are not liquid, and we do not expect that they will be liquid for some time. Our investment in Fisker exposes us to equity price risk; if Fisker does not execute on its strategic plan, our investment may not be recovered. This investment is subject to risk of loss in value, which could result in a material realized impairment loss. During the year ended December 31, 2011, we elected not to participate in Fisker's subsequent stock financing. This election not to participate resulted in the conversion of our preferred shares of Fisker to common shares on a 2:1 ratio. As such, we performed an analysis and valuation of our investment in Fisker resulting to the recognition of an impairment charge of $11.6 million for the year ended December 31, 2011.

We have identified an unremediated material weakness in our internal control over financial reporting and if we fail to remediate this weakness and maintain proper and effective internal controls, our ability to produce accurate and timely financial statements could be impaired, which could harm our operating results, our ability to operate our business and investors' views of us.

For the year ended December 31, 2009, we identified two material weaknesses in our internal controls over financial reporting. For the year ended December 31, 2010, the previously identified material weaknesses were aggregated into a single material weakness. For the year ended December 31, 2011, management identified a material weakness in our internal controls and information technology controls over the financial statement close and reporting process. A material weakness is defined as a deficiency, or combination of deficiencies, in internal control over financial reporting, such that there is a reasonable possibility that a material misstatement of the company's annual or interim financial statements will not be prevented or detected on a timely basis by the company's internal controls. As a result of our unremediated material weakness, our management cannot certify that our internal controls over financial reporting were effective at a reasonable assurance level. For a detailed discussion of the material weakness, see "Controls and Procedures" section with Part II, Item 9A.

We are in the process of taking the necessary steps to remediate the material weakness that we identified and have made enhancements to our control procedures; however, the material weakness will not be remediated until the necessary controls have been implemented and are determined to be operating effectively. We do not know the specific time frame needed to fully remediate the material weakness identified.

We cannot assure you that our efforts to fully remediate this internal control weakness will be successful or that similar material weaknesses will not recur.

Implementing any appropriate changes to our internal controls may distract our officers and employees, entail substantial costs to implement new processes and modify our existing processes and take significant time to complete. Moreover, these changes do not guarantee that we will be effective in maintaining the adequacy of our internal controls, and any failure to maintain that adequacy, or consequent inability to produce accurate financial statements on a timely basis, could increase our operating costs and harm our business. In addition, investors' perceptions that our internal controls are inadequate or that we are unable to produce accurate financial statements on a timely basis may harm our stock price and make it more difficult for us to effectively market and sell our products to new and existing customers.

If our warranty expense estimates differ materially from our actual claims, or if we are unable to estimate future warranty expense for new products, our business and financial results could be harmed.

Our warranty for our products ranges from one to five years from the date of sale, depending on the type of product and its application. We expect that in the future some of our warranties could extend beyond five years. In the commercial market, we typically provide a warranty against certain potential manufacturing defects, which may cause high rates of self-discharge, inaccurate voltage, and other product irregularities. In the electric grid services and transportation markets, we may also provide a warranty against a certain percentage decline in the initial power and energy density specifications of a particular product and for a warranty for system availability. Since we began selling our first products in the commercial market in the first quarter of 2006, in the transportation market in the first quarter of 2007 and in the electric grid services market in the third quarter of 2009, we have a limited product history on which to base our warranty estimates. Because of the limited operating history of our batteries and battery systems, our management is required to make assumptions and to apply judgment regarding a number of factors, including anticipated rate of warranty claims, the durability and reliability of our products, and service delivery costs. Our assumptions could prove to be materially different from the actual performance of our batteries and battery systems, which could cause us to incur substantial expense to repair or replace defective products in the future and may exceed expected levels against which we have reserved. If our estimates prove incorrect, we could be required to accrue additional expenses from the time we realize our estimates are incorrect and also face a significant unplanned cash burden at the time our customers make a warranty claim, which could harm our operating results.

In addition, with our new products and products that remain under development, we will be required to base our warranty estimates on historical experience of similar products testing of our batteries and performance information learned during our development activities with the customer. If we are unable to estimate future warranty costs for any new product, we will be required to defer recognizing revenue for that product until we are reasonably able to estimate the associated warranty expense. As a result, our financial results could vary significantly from period-to-period.

Product liability or other claims could cause us to incur losses or damage our reputation.

The risk of product liability claims and associated adverse publicity is inherent in the development, manufacturing, marketing and sale of batteries and battery systems. Certain materials we use in our batteries, as well as our batteries and battery systems, could, if used improperly, cause injuries to others. Improperly charging or discharging our batteries could cause fires. Any accident involving our batteries or other products could decrease or even eliminate demand for our products. Because some of our batteries are designed to be used in vehicles, and because vehicle accidents can cause injury to persons and damage to property, we are subject to a risk of claims for such injuries and damages. In addition, we could be harmed by adverse publicity resulting from problems or accidents caused by third party products that incorporate our batteries. For example, our business and operating results could be harmed by adverse publicity resulting from injury to persons or damage to property caused by a defective electronic system on a battery system manufactured by a third party that incorporates our batteries.

Although we have product liability insurance for our products, this may be inadequate to cover all potential product liability claims or claims resulting from design defects. In addition, while we often seek to limit our product liability in our contracts, such limits may not be enforceable or may be subject to exceptions. Any product recall or lawsuit seeking significant monetary damages either in excess of our coverage, or outside of our coverage, may have a material adverse effect on our business and financial condition. We may not be able to secure additional product liability insurance coverage or other forms of insurance coverage on acceptable terms or at reasonable costs when needed. If we were to experience a large insured loss or business interruption, it might exceed our coverage limits or may

not be covered, or our insurance carriers could decline to further cover us or raise our insurance rates to unacceptable levels, any of which could impair our financial position and results of operations. A successful product liability claim against us could require us to pay a substantial monetary award. We cannot assure that such claims will not be made in the future.

We are subject to financial and reputational risks due to product recalls resulting from product quality and liability issues.

The risk of product recalls, and associated adverse publicity, is inherent in the development, manufacturing, marketing, and sale of batteries and battery systems. Our products and the products of third parties in which our products are a component are becoming increasingly sophisticated and complicated as rapid advancements in technologies occur, and as demand increases for lighter and more powerful rechargeable batteries. At the same time, product quality and liability issues present significant risks. Product quality and liability issues may affect not only our own products but also the third-party products in which our batteries and battery systems are a component. Moreover, several of our applications have entered commercial production and are being operated in the field, so we are at increased risk of encountering unanticipated technical issues that could result in product recalls.

Our efforts and the efforts of our development partners to maintain product quality may not be successful, and if they are not, we may incur expenses in connection with, for example, product recalls and lawsuits, and our brand image and reputation as a producer of high-quality products may suffer. Any product recall or lawsuit seeking significant monetary damages could have a material adverse effect on our business and financial condition. A product recall could generate substantial negative publicity about our products and business, interfere with our manufacturing plans and product delivery obligations as we seek to replace or repair affected products, and inhibit or prevent commercialization of other future product candidates. Although we do have product liability insurance, we do not have insurance to cover the costs associated with a product recall nor do we have insurance for design defects, and the expenses we would incur in connection with a product recall could have a material adverse affect on our operating results.

We depend on third parties to deliver raw materials, parts, components and services in adequate quality and quantity in a timely manner and at a reasonable price.

Our manufacturing operations depend on obtaining raw materials, parts and components, manufacturing equipment and other supplies including services from reliable suppliers in adequate quality and quantity in a timely manner. It may be difficult for us to substitute one supplier for another, increase the number of suppliers or change one component for another in a timely manner or at all due to the interruption of supply or increased industry demand. This may adversely affect our operations. The prices of raw materials, parts and components and manufacturing equipment may increase due to changes in supply and demand. In addition, currency fluctuations and a weakening of the U.S. dollar against foreign currencies may adversely affect our purchasing power for raw materials, parts and components and manufacturing equipment from foreign suppliers.

We depend on sole source suppliers or a limited number of suppliers for certain key raw materials and component parts used in manufacturing and developing our products. We generally purchase raw materials pursuant to purchase orders placed from time to time and if we deem necessary (and if possible), we will enter into long-term contracts or other guaranteed supply arrangements with our sole or limited source suppliers. Therefore, our operating margins may be impacted by price fluctuations in the commodities we use as raw materials in our batteries. As a result, our suppliers may not be able to meet our requirements relative to specifications and volumes for key raw materials, and we may not be able to locate alternative sources of supply at an acceptable cost. In the past, we have experienced delays in product development due to the delivery of raw materials from our suppliers that do not meet our specifications. In addition, if a sole source supplier ceased to continue to produce a component

with little or no notice to us, our business could be harmed. Any future inability to obtain high quality raw materials or manufacturing equipment in sufficient quantities on competitive pricing terms and on a timely basis, due to global supply and demand or a dispute with a supplier, may delay battery production, impede our ability to fulfill existing or future purchase orders and harm our reputation and profitability.

If we are unable to obtain supplies of materials we use in the manufacturing process of our batteries sufficient to meet our planned demand levels, our results of operations could be materially adversely affected.

Our supply of materials we use in the electrode coating process of our batteries was disrupted by the earthquake and tsunami that occurred in Japan on March 11, 2011. We currently have inventory of these materials on hand, in transit, or committed from our supplier that we believe will support our manufacturing operations through December 2012. However, if we are not able to obtain these or additional materials from our supplier, or if there is a prolonged disruption in our suppliers' manufacturing capability and we are delayed or are not able to qualify a second source of supply, our results of operations would be materially adversely affected and we would not be able to achieve our planned financial results. We are not currently aware of any other supply issue related to the earthquake in Japan affecting our business, although it is possible that there may be future unanticipated global events that could cause similar disruptions to our supply chain. Our automotive and electric grid customers comprise a substantial portion of our current and projected future revenue, and any such disruption in their supply chain or future disruption in our supply chain, or even the potential for such disruption, could cause delays in our programs and have a material adverse effect on our business, results of operations and financial outlook.

Our inability to obtain federal and state government environmental permits and approvals for our planned U.S. manufacturing facilities could negatively impact our ability to obtain federal and state incentive funding and materially harm our business.

Pursuant to applicable environmental and safety laws and regulations, we are required to obtain and maintain certain governmental permits and approvals and to comply with applicable federal and state environmental laws and regulations. There is no guarantee that required determinations, permits and approvals will ultimately be obtained; the failure to obtain and/or maintain required federal and state environmental permits could have an adverse effect on our financial results and could also delay or prevent us from obtaining matching fund reimbursement from the $249.1 million grant we were awarded under the DOE Battery Initiative, as well as potential funding under the DOE ATVM loan program.

If obtained, permits and approvals may be subject to revocation, modification or denial under certain circumstances. Our operations or activities could result in administrative or private actions, revocation of required permits or licenses, or fines, penalties or damages, which could have an adverse effect on us. In addition, environmental laws will likely become more stringent over time, thereby requiring new capital expenditures and increases in operating costs.

Our working capital requirements involve estimates based on demand expectations and may decrease or increase beyond those currently anticipated, which could harm our operating results and financial condition.

In order to fulfill the product delivery requirements of our customers, we plan for working capital needs in advance of customer orders. As a result, we base our funding and inventory decisions on estimates of future demand. If demand for our products does not increase as quickly as we have estimated or drops off sharply, our inventory and expenses could rise, and our business and operating results could suffer. Alternatively, if we experience sales in excess of our estimates, our working capital needs may be higher than those currently anticipated. Our ability to meet this excess customer demand

depends on our ability to arrange for additional financing for any ongoing working capital shortages, since it is likely that cash flow from sales will lag behind these investment requirements.

Credit market volatility and illiquidity may affect our ability to raise capital to finance our operations, plant expansion and growth.

The credit markets have experienced extreme volatility in recent years, and worldwide credit markets have remained unstable despite injections of capital by the federal government and foreign governments. Despite the capital injections and government actions, banks and other lenders, such as equipment leasing companies, have significantly increased credit requirements and reduced the amounts available to borrowers. Companies with low credit ratings may not have access to the debt markets until the liquidity improves, if at all. If current credit market conditions do not improve, we may not be able to access debt or leasing markets to finance our plant expansion plans.

We may be unable to successfully implement or manage our planned manufacturing expansion of capability or realize the expected benefits of an expansion.

We expect to aggressively expand our battery manufacturing capacity to meet expected demand for our products. Much of our planned domestic expansion, such as our current expansion in Livonia and Romulus, Michigan, depends upon our receipt of sufficient federal and state incentive funding and our ability to successfully ramp our manufacturing operations, particularly in the production of prismatic batteries. We may not receive the federal and state funding necessary for our planned expansion at all or on a timely basis. In addition, such funding could be subject to conditions that are commercially unacceptable to us or for which we are unable to comply. Even if we succeed in aggressively expanding our manufacturing capacity, we may not have enough demand for our products to justify the increased capacity.

Any such expansion will place a significant strain on our senior management team and our financial and other resources. Any expansion will expose us to greater overhead and support costs and other risks associated with the manufacture and commercialization of new products. Our ability to manage our growth effectively will require us to continue to improve our operations and our financial and management information systems and to train, motivate and manage our employees. Difficulties in effectively managing the budgeting, forecasting and other process control issues presented by such a rapid expansion could harm our business, prospects, results of operations and financial condition.

We may not be able to successfully recruit and retain skilled employees, particularly scientific, technical and management professionals.

We believe that our future success will depend in large part on our ability to attract and retain highly skilled technical, managerial and marketing personnel who are familiar with our key customers and experienced in the battery industry. Additionally, we plan to continue to expand our work force both domestically and internationally. Industry demand for such employees, especially employees with experience in battery chemistry and battery manufacturing processes, however, exceeds the number of personnel available, and the competition for attracting and retaining these employees is intense. This competition will intensify if the advanced battery market continues to grow, possibly requiring increases in compensation for current employees over time. We compete in the market for personnel against numerous companies, including larger, more established competitors who have significantly greater financial resources than we do and may be in a better financial position to offer higher compensation packages to attract and retain human capital. We cannot be certain that we will be successful in attracting and retaining the skilled personnel necessary to operate our business effectively in the future. Because of the highly technical nature of our batteries and battery systems, the loss of any significant number of our existing engineering and project management personnel could have a material adverse effect on our business and operating results.

Our success will depend to a significant extent on the continued services of our senior management team, and in particular David Vieau, our chief executive officer, and Gilbert N. Riley, Jr., our chief technical officer. The loss or unavailability of either of these individuals could harm our ability to execute our business plan, maintain important business relationships and complete certain product development initiatives, which could harm our business. We do not have agreements requiring any of our senior management team to remain with our company. In addition, each of these individuals could terminate his or her relationship with us at any time, and we may be unable to enforce any applicable employment or non-compete agreements.

If we do not continue to form and maintain economic arrangements with original equipment manufacturers, or OEMs, to commercialize our products, our profitability could be impaired.

Part of our business strategy requires us to integrate the design of our products into products being developed by OEMs, and therefore to identify acceptable OEMs and enter into agreements with them. In addition, we will need to meet their requirements and specifications by developing and introducing new products and enhanced or modified versions of our existing products on a timely basis. OEMs often require unique configurations or custom designs for batteries or battery systems which must be developed and integrated into a product well before the product is launched. This development process requires not only substantial lead time between the commencement of design efforts for a customized battery system and the commencement of volume shipments of the battery systems to the customer, but also the cooperation and assistance of the OEMs in order to determine the requirements for each specific application. Technical problems may arise that affect the acceptance of our product by OEMs. If we are unable to design and develop products that meet OEMs' requirements, we may lose opportunities to obtain purchase orders, and our reputation may be damaged. In addition, we may not receive adequate assistance from OEMs to successfully commercialize our products, which could impair our profitability.

Our business is subject to intense price competition worldwide, which makes it difficult for us to maintain product prices and achieve adequate profits. Such intense price competition may adversely affect our ability to achieve profitability, especially during periods of decreases in demand. In addition, because of their purchasing size, our larger automotive customers can influence market participants to compete on price terms. If we are not able to offset pricing reductions resulting from these pressures by improved operating efficiencies and reduced expenditures, those pricing reductions may have an adverse impact on our business.

Implementations of new software platforms or modifications to existing platforms may disrupt our business and operations and could harm our operating results.

The implementation of new software management platforms and the addition of these platforms at new locations, especially overseas, require significant management time, support and cost. As our business continues to develop, we expect to add and enhance existing management platforms in the areas of financial, inventory control, engineering, and customer support and warranty management. We cannot be sure that these platforms will be fully or effectively implemented on a timely basis, if at all. If we do not successfully implement or modify these platforms, our operations may be disrupted and our operating expenses could be harmed. In addition, the new systems may not operate as we expect them to, and we may be required to expend significant resources to correct problems or find alternative sources for performing these functions.

Our inability to effectively and quickly transfer, replicate and scale our new product manufacturing processes from low volume prototype production to high volume manufacturing facilities, could adversely affect our results of operations.

Under our manufacturing model, we develop and establish manufacturing processes and systems for the low volume prototype production of our new products. As demand increases for a product, we transfer these processes and systems to, and replicate and scale these processes and systems in our high volume manufacturing facilities. If we are unable to effectively and quickly transfer, replicate and scale these manufacturing processes and systems, such as replicating our prismatic pilot facility in Korea to our new facilities in Livonia and Romulus, Michigan, we may be unable to meet our customers' product quality and quantity requirements and lower our costs of goods sold and our results of operations could be adversely affected.

In addition, our costs of goods sold for some of our new products exceed the purchase price for that product paid to us by our customers. If we are unable to decrease unit production costs for these products by increasing volumes, improving the manufacturing process, reducing transportation and handling costs or obtaining lower cost raw materials or component parts, we will not realize a profit from these products and our business will be harmed.

Problems in our manufacturing and assembly processes could limit our ability to produce sufficient batteries to meet the demands of our customers.

Regardless of the process technology used, the manufacturing and assembly of safe, high-power batteries and battery systems is a highly complex process that requires extreme precision and quality control throughout a number of production stages. Any defects in battery packaging, impurities in the electrode materials used, contamination of the manufacturing environment, incorrect welding, excess moisture, equipment failure or other difficulties in the manufacturing process could cause batteries to be rejected, thereby reducing yields and affecting our ability to meet customer expectations.

As we have scaled up our production capacity, we have experienced production problems that limited our ability to produce a sufficient number of batteries to meet the demands of certain customers. For example, in 2010, we identified several significant technical issues in the manufacturing scale-up of our prismatic batteries. Although we identified and have taken corrective actions for these issues, the problems encountered resulted in a higher yield loss in ramp-up production, temporary halts in the production process and distraction of personnel. If these or other production problems recur and we are unable to resolve them in a timely fashion, our business could suffer and our reputation may be harmed. In addition, in December 2011, we determined that some of the battery packs we produce for Fisker could have a potential safety issue relating to the battery cooling system due to the misalignment of certain hose clamps in the battery pack's internal cooling system. While there were no related battery performance or safety incidents with cars in the field and corrective actions were promptly undertaken, the problem required unanticipated management time and expense as well as the rapid re-deployment of technical personnel to the field.

Our failure to cost-effectively manufacture our batteries and battery systems in quantities which satisfy our customers' demand and product specifications and their expectations for product quality and reliable delivery could damage our customer relationships and result in significant lost business opportunities for us.

We manufacture a substantial percentage of our products rather than relying upon third-party outsourcing. To be successful, we must cost-effectively manufacture commercial quantities of our complex batteries and battery systems that meet our customer specifications for quality and timely delivery. To facilitate the commercialization of our products, we will need to further reduce our manufacturing costs, which we intend to do by working with manufacturing partners and by improving our manufacturing and development operations in our wholly-owned operations in China. We

manufacture our batteries and assemble our products in China, Korea, Massachusetts and Michigan. We depend on the performance of our manufacturing partners, as well as our own manufacturing operations, to manufacture and deliver our products to our customers. If we or any of our manufacturing partners are unable to manufacture products in commercial quantities on a timely and cost-effective basis, we could lose our customers and be unable to attract future customers.

In addition, we are shifting most of our battery assembly and all of our battery system manufacturing from contract manufacturing to in-house manufacturing, so our in-house experience with battery assembly and battery system manufacturing is limited.

We entered into a joint venture in China that, if not successful, could adversely impact our business, business prospects and operating results.

In December 2009, we formed a joint venture with SAIC Motor Co. Ltd., or SAIC, a leading automaker in China. We have a 49 percent minority interest in the joint venture, Shanghai Advanced Traction Battery Systems Co., Ltd., or ATBS, which is domiciled in Shanghai, China. Pursuant to the joint venture agreements, we are supplying ATBS with battery cells and, as requested by ATBS, we have granted necessary advanced technology licenses to ATBS for the development, manufacture and service of battery systems. In addition, we have made capital contributions to ATBS in an aggregate amount of $4.7 million.

The business of ATBS is subject to all the operational risks that normally arise for a technology company with global operations pertaining to research and development, manufacturing, sales, service, marketing and corporate functions. In addition, there could be disagreements between us and SAIC with respect to important strategic and operational decisions. Operating a business as a joint venture often requires additional organizational formalities as well as time-consuming procedures for sharing information and making decisions. We may be required to pay more attention to our relationship with SAIC, as the co-owner of ATBS, and if SAIC ceases to be the co-owner of ATBS, our relationship with ATBS may be adversely affected. Additionally, as we are sharing intellectual property with ATBS, we face the risks that we may not be able to maintain or enforce the rights to our intellectual property.

If the joint venture terminates, the joint venture could retain technical knowhow relating to battery systems transferred by us as part of the agreement. Additionally, we would have to find new partners or separately pursue market opportunities in China which could cause us to incur additional time and expense.

Laws regulating the manufacture or transportation of batteries may be enacted which could result in a delay in the production of our batteries or the imposition of additional costs that could harm our ability to be profitable.

Laws and regulations exist today, and additional laws and regulations may be enacted in the future, which impose environmental, health and safety controls on the storage, shipment, use and disposal of certain chemicals and metals used in the manufacture of lithium-ion batteries. Complying with any laws or regulations could require significant time and resources from our technical staff and possible redesign of one or more of our products, which may result in substantial expenditures and delays in the production of one or more of our products, all of which could harm our business and reduce our future profitability. The transportation of lithium and lithium-ion batteries and applicable customs duties are regulated both domestically and internationally. Compliance with these regulations, when applicable, increases the cost of producing and delivering our products.

We depend on contracts with the U.S. government and its agencies or on subcontracts with the U.S. government's prime contractors for revenue and research grants to fund or partially fund our research and development programs, and our failure to retain current or obtain additional contracts could preclude us from achieving our anticipated levels of revenue growth and profitability, increase our research, development and engineering expenses and delay or halt certain research and development programs.

Our ability to develop and market some of our products depends upon maintaining our U.S. government contract revenue and research grants obtained, which are recorded as incremental revenue and an offset to our research, development and engineering expenses, respectively. Many of our U.S. government contracts are funded incrementally, with funding decisions made on an annual basis. Approximately 5% of our total revenue and 8% of our research, development and engineering expenses during the year ended December 31, 2011 were derived from or funded by government contracts and subcontracts. Changes in government policies, priorities or programs that result in budget reductions could cause the government to cancel existing contracts or eliminate follow-on phases in the future which would severely inhibit our ability to successfully complete the development and commercialization of some of our products. In addition, there can be no assurance that, once a government contract is completed, it will lead to follow-on contracts for additional research and development, prototype build and test or production. Furthermore, there can be no assurance that our U.S. government contracts or subcontracts will not be terminated or suspended in the future. A reduction or cancellation of these contracts, or of our participation in these programs, would increase our research, development and engineering expenses, which could materially and adversely affect our results of operations and could delay or impair our ability to develop new technologies and products.

If we are unable to develop manufacturing facilities for our products in the United States, we may lose business opportunities and our customer relationships may suffer.

We believe that developing manufacturing facilities for our products in the United States is important, in order to address national security and economic imperatives, such as job creation, as well as to more efficiently address the needs of our U.S.-based customers. This expansion depends upon our receiving federal and state financial incentives, primarily in the form of direct grants and loans, to provide the necessary capital for facilities and equipment. If we are unable to obtain this government assistance on a timely basis and in the amounts requested, we will not be able to scale our capacity to meet current and future customer demand for our products.

Because of the funding we receive from U.S. government entities and our government business initiatives, we are subject to U.S. federal government audits and other regulation, and our failure to satisfy audit requirements or comply with applicable regulations could subject us to material adjustments or penalties that could negatively impact our business.

The accuracy and appropriateness of our direct and indirect costs and expenses under our contracts with the U.S. government are subject to extensive regulation and audit by appropriate agencies of the U.S. government. These agencies have the right to challenge our cost estimates or allocations with respect to any such contract. Additionally, substantial portions of the payments to us under U.S. government contracts are provisional payments that are subject to potential adjustment upon audit by such agencies. Adjustments that result from inquiries or audits of our contracts could have a material adverse impact on our financial condition or results of operations. Since our inception, we have not experienced any material adjustments as a result of any inquiries or audits, but there can be no assurance that our contracts will not be subject to material adjustments in the future.

As we grow our government business, we may also need to comply with U.S. laws regulating the export of our products, particularly in our government business. We cannot be certain of our ability to obtain any licenses required to export our products or to receive authorization from the U.S. federal government for international sales or domestic sales to foreign persons. Moreover, the export regimes and the governing policies applicable to our business are subject to change. Our failure to comply with these and other applicable regulations, rules and approvals could result in the imposition of penalties, the loss of our government contracts or our suspension or debarment from contracting with the federal government generally, any of which would harm our business, financial condition and results of operations.

Our ability to sell our products to our direct, OEM and tier 1 supplier customers depends in part on the quality of our engineering and customization capabilities, and our failure to offer high quality engineering support and services could have a material adverse effect on our sales and operating results.

A high level of support is critical for the successful marketing and sale of our products. The sale of our batteries and battery systems is characterized by significant co-development and customization work in certain applications. This development process requires not only substantial lead time between the commencement of design efforts for a customized battery system and the commencement of volume shipments of the battery systems to the customer, but also the cooperation and assistance of the OEMs to determine the requirements for each specific application. Once our products are designed into an OEM or tier 1 supplier customer's products or systems, the OEM or tier 1 supplier customer depends on us to resolve issues relating to our products. If we do not effectively assist our OEM or tier 1 supplier customers in customizing, integrating and deploying our products in their own systems or products, or if we do not succeed in helping them quickly resolve post-deployment issues and provide effective ongoing technical support, our ability to sell our products would be adversely affected.

In addition, while we have supply and co-development agreements with customers located in different regions of the world, we do not have a globally distributed engineering support and services organization. Currently, any issue resolution related to our products, system deployment or integration is channeled back to our responsible business units in Massachusetts and in Michigan, from which engineers and support personnel are deployed. As we grow our business with our existing customers and beyond the markets into which we currently sell our battery technologies, we may need to increase the size of our engineering support teams and deploy them closer to our customers. Our inability to deliver a consistent level of engineering support and overall service as we expand our operations could have a material adverse effect on our business and operating results. Moreover, despite our internal quality testing, our products may contain manufacturing or design defects or exhibit performance problems at any stage of their lifecycle. These problems could result in expensive and time-consuming design modifications and impose additional needs for engineering support and maintenance services as well as significant warranty charges.

Our past and future operations may lead to substantial environmental liability.

The handling and use of some of the materials used in the development and manufacture of our products are subject to federal, state and local environmental laws, as well as environmental laws in other jurisdictions in which we operate. Under applicable environmental laws, we may be jointly and severally liable with prior property owners for the treatment, cleanup, remediation and/or removal of any hazardous substances discovered at any property we use. In addition, courts or government agencies may impose liability for, among other things, the improper release, discharge, storage, use, disposal or transportation of hazardous substances. If we incur any significant environmental liabilities, our ability to execute our business plan and our financial condition would be harmed. Our facilities or operations could be damaged or adversely affected as a result of disasters or unpredictable events, including widespread public health problems.

Our headquarters, including administrative offices and research and development centers, are located in Massachusetts. We also operate manufacturing, logistics, sales and research and development facilities in Michigan, Missouri, China, Korea and Germany. If major disasters such as earthquakes, fires, floods, hurricanes, wars, terrorist attacks, computer viruses, pandemics or other events occur, or our information system or communications network breaks down or operates improperly, our facilities may be seriously damaged, or we may have to stop or delay production and shipment of our products. We may incur expenses relating to such damages some or all of which may not be covered by insurance. In addition, a renewed outbreak of a widespread public health problem in China or the United States could have a negative effect on our operations.

In the past, parties have asserted that they own or control patents that are infringed by our products.

We recently settled a patent litigation with Hydro-Québec and the University of Texas, or UT, involving certain patents Hydro-Québec has licensed from UT, related to electrode materials used in lithium-ion batteries. This litigation was initially commenced in 2006 and had been scheduled to go to trial in December 2011. For a more detailed discussion of our patent litigation, see Item 3 of Part II: "Legal Proceedings."

The mere existence, and the uncertainty with respect to the ultimate outcome, of any other patent litigation that we may become involved with, could cause our current and potential customers, development partners, the federal or state governments and licensees to stop, delay or avoid doing business with us or modify the extent to which they are willing to do business with us, and this loss or delay of business could harm our operating results and our ability to execute on our business plan.

Other parties may also bring intellectual property infringement claims against us which would be time-consuming and expensive to defend, and if any of our products or processes is found to be infringing, we may not be able to procure licenses to use patents necessary to our business at reasonable terms, if at all.

Our success depends in part on avoiding the infringement of other parties' patents and proprietary rights. We may inadvertently infringe existing third-party patents or third-party patents issued on existing patent applications. In the United States and most other countries, patent applications are published 18 months after filing. As a result, there may be third-party pending patent applications of which we are unaware, and which we may infringe once they issue. These third parties could bring claims against us that, even if resolved in our favor, could cause us to incur substantial expenses and, if resolved against us, could cause us to pay substantial damages. Under some circumstances in the United States, these damages could be triple the actual damages the patent holder incurs. If we have supplied infringing products to third parties for marketing or licensed third parties to manufacture, use or market infringing products, we may be obligated to indemnify these third parties for any damages they may be required to pay to the patent holder and for any losses the third parties may sustain themselves as the result of lost sales or damages paid to the patent holder. In addition, we may have, and may be required to, make representations as to our right to supply and/or license intellectual property and to our compliance with laws. Such representations are usually supported by indemnification provisions requiring us to defend our customers and otherwise make them whole if we license or supply products that infringe on third party technologies or violate government regulations. Further, if a patent infringement suit were brought against us, we and our customers, development partners and licensees could be forced to stop or delay research, development, manufacturing or sales of products based on our technologies in the country or countries covered by the patent we infringe, unless we can obtain a license from the patent holder. Such a license may not be available on acceptable terms, or at all, particularly if the third party is developing or marketing a product competitive with products based on our technologies. Even if we were able to obtain a license, the rights may be nonexclusive, which would give our competitors access to the same intellectual property.

Any successful infringement action brought against us may also adversely affect marketing of products based on our technologies in other markets not covered by the infringement action. Furthermore, we may suffer adverse consequences from a successful infringement action against us even if the action is subsequently reversed on appeal, nullified through another action or resolved by settlement with the patent holder. As a result, any infringement action against us would likely harm our competitive position, be costly and require significant time and attention of our key management and technical personnel.

We may be involved in lawsuits to protect or enforce our patents, which could be expensive and time consuming.

Competitors or others may infringe our patents. To counter infringement or unauthorized use, we may be required to file patent infringement claims, which can be expensive and time-consuming. In addition, in an infringement proceeding, a court may decide that a patent of ours is not valid or is unenforceable, or may refuse to stop the other party from using the technology at issue on the grounds that our patents do not cover that technology. An adverse determination of any litigation or defense proceedings could put one or more of our patents at risk of being invalidated or interpreted narrowly and could put our patent applications at risk of not issuing.

Interference proceedings brought by the United States Patent and Trademark Office may be necessary to determine the priority of inventions with respect to our patent applications. Litigation or interference proceedings may fail and, even if successful, may result in substantial costs and be a distraction to our management. We may not be able to prevent misappropriation of our proprietary rights, particularly in countries where the laws may not protect such rights as fully as in the United States.

Furthermore, because of the substantial amount of discovery required in connection with intellectual property litigation, there is a risk that some of our confidential information could be compromised by disclosure. In addition, during the course of this litigation, there could be public announcements of the results of hearings, motions or other interim proceedings or developments. If securities analysts or investors perceive these results to be negative, it could have a substantial adverse effect on the price of our common stock.

We may not prevail in any litigation or interference proceeding in which we are involved. Even if we do prevail, these proceedings can be expensive and distract our management.

Our patent applications may not result in issued patents, which may have a material adverse effect on our ability to prevent others from commercially exploiting products similar to ours.

Patent applications in the United States are maintained in secrecy until the patents are published or are issued. Since publication of discoveries in the scientific or patent literature tends to lag behind actual discoveries by several months, we cannot be certain that we are the first creator of inventions covered by pending patent applications or the first to file patent applications on these inventions. We also cannot be certain that our pending patent applications will result in issued patents or that any of our issued patents will afford protection against a competitor. In addition, patent applications filed in foreign countries are subject to laws, rules and procedures that differ from those of the United States, and thus we cannot be certain that foreign patent applications related to issued U.S. patents will be issued. Furthermore, if these patent applications issue, some foreign countries provide significantly less effective patent enforcement than in the United States.

The status of patents involves complex legal and factual questions and the breadth of claims allowed is uncertain. Accordingly, we cannot be certain that the patent applications that we file will result in patents being issued, or that our patents and any patents that may be issued to us in the near future will afford protection against competitors with similar technology. In addition, patents issued to

us may be infringed upon or designed around by others and others may obtain patents that we need to license or design around, either of which would increase costs and may adversely affect our operations.

Our patents and other protective measures may not adequately protect our proprietary intellectual property.

We regard our intellectual property, particularly our proprietary rights in our battery and battery system technology, as critical to our success. We have received a number of patents, and filed other patent applications, for various applications and aspects of our technology or processes and other intellectual property. In addition, we generally enter into confidentiality and invention agreements with our employees and consultants. Such patents and agreements and various other measures we take to protect our intellectual property from use by others may not be effective for various reasons, including the following:

We may be unable to adequately prevent disclosure or misappropriation of trade secrets and other proprietary information.

We rely on trade secrets to protect our proprietary technologies, especially where we do not believe patent protection is appropriate or obtainable. However, trade secrets are difficult to protect. We rely in part on confidentiality and non-compete agreements with our employees, former employees, contractors, consultants, outside scientific collaborators and other advisors to protect our trade secrets and other proprietary information. These agreements may not effectively prevent disclosure of confidential information and may not provide an adequate remedy in the event of unauthorized disclosure or misappropriation of confidential information. Such unauthorized disclosure or misappropriation may also be difficult to prevent or enforce against current or former employees in locations outside of the United States (e.g., in China) where the legal systems and law enforcement are less developed, extradition treaties may not exist and business practices differ. In addition, others may independently discover our trade secrets or independently develop processes or products that are similar or identical to our trade secrets, and courts outside the United States may be less willing to protect trade secrets. Costly and time-consuming litigation could be necessary to enforce and determine the scope of our proprietary rights, and failure to obtain or maintain trade secret protection could adversely affect our competitive business position.

Risks Associated With Doing Business Internationally and Specifically in China and Korea

Our substantial international operations subject us to a number of risks, including unfavorable political, regulatory, labor and tax conditions.

We have significant manufacturing facilities and operations in China and Korea that are subject to the legal, political, regulatory and social requirements and economic conditions in these jurisdictions. In addition, we expect to sell a significant portion of our products to customers located outside the United States. Risks inherent to international operations and sales, include, but are not limited to, the following:

Our business in foreign jurisdictions requires us to respond to rapid changes in market conditions in these countries. Our overall success as a global business depends on our ability to succeed in different legal, regulatory, economic, social and political situations and conditions. We may not be able to develop and implement effective policies and strategies in each foreign jurisdiction where we do business. Also, each of the foregoing risks will likely take on increased significance as we implement plans to expand foreign manufacturing operations.

Since many of our products are manufactured in China, we own and lease manufacturing facilities in China and the Chinese market is of growing importance for our products, we face risks if China loses normal trade relations status with the United States or if US-China trade relations are otherwise adversely impacted.

We manufacture and export our products from China and own and lease manufacturing facilities in China. We also sell our products in China. Our products sold in the United States have normal trade relations status and are currently not subject to United States import duties. As a result of opposition to certain policies of the Chinese government and China's growing trade surpluses with the United States, there has been, and in the future may be, opposition to normal trade relations status with China. The United States Congress may also introduce China trade legislation targeting currency manipulation, which may adversely affect our business in China. The loss of normal trade relations

status for China, changes in current tariff structures or adoption in the United States of other trade policies adverse to China, and any retaliatory measures that impact our products in the Chinese market, could have an adverse effect on our business.

A change in exchange rates mandated by legislation could negatively impact the cost of imported raw materials and products.

Furthermore, our business and operations may be adversely affected by deterioration of the diplomatic and political relationships between the United States and China. If the relationship between the United States and China were to materially deteriorate, it could negatively impact our ability to control our operations and relationships in China, enforce any agreements we have with Chinese partners or otherwise deal with any assets or investments we may have in China.

Our ongoing manufacturing operations in China are complex and having these remote operations may divert management's attention, lead to disruptions in operations, delay implementation of our business strategy and make it difficult to establish adequate management and financial controls in China. Our plans to grow our business to include sales to Chinese customers may necessitate additional management attention to establishing and maintaining one or more joint venture relationships with Chinese parties.

Currently, we have significant manufacturing operations in China, including a joint venture. We may not be able to find or retain suitable employees in China and we may have to train personnel to perform necessary functions for our manufacturing, senior management and development operations. This may divert management's attention, lead to disruptions in operations and delay implementation of our business strategy, all of which could negatively impact our profitability.

China has only recently begun to adopt management and financial reporting concepts and practices like those with which investors in the United States are familiar. We may have difficulty in hiring and retaining employees in China who have the experience necessary to implement the kind of management and financial controls that are expected of a United States public company. If we cannot establish and implement such controls, we may experience difficulty in collecting financial data and preparing financial statements, books of account and corporate records and instituting business practices that meet U.S. standards.

In order to grow our business and sales to Chinese customers we have entered into a Chinese-foreign joint venture with a Chinese partner. A Chinese-foreign joint venture can be a complex business arrangement requiring substantial management attention to the joint venture relationship. The joint venture will also require capital contributions and due to China's foreign exchange controls, uncertainty as to the ability to repatriate profits and principal out of China. Our plans to grow our business to include sales to Chinese customers may require additional management attention to establishing and maintaining additional joint venture relationships with Chinese parties.

Because of the relative weakness of the Chinese legal system in general, and the intellectual property regime in particular, we may not be able to enforce intellectual property rights in China.

The legal regime protecting intellectual property rights in China is weak. Because the Chinese legal system in general, and the intellectual property regime in particular, are relatively weak, it is often difficult to create and enforce intellectual property rights in China. Accordingly, we may not be able to effectively protect our intellectual property rights in China against business entities, individuals and current and former employees.

Enforcing agreements and laws in China is difficult and may be impossible because China does not have a comprehensive system of laws.

We depend on our relationships with our Chinese manufacturing partners and suppliers. In China, enforcement of contractual agreements may be sporadic, and implementation and interpretation of laws may be inconsistent. The Chinese judiciary is relatively inexperienced in interpreting agreements and enforcing China's laws, leading to a higher than usual degree of uncertainty as to the outcome of any litigation. Even where adequate law exists in China, it may not be possible to obtain swift and equitable enforcement of such law, or to obtain enforcement of a judgment or an arbitration award by a court of another jurisdiction.

The government of China may change or even reverse its policies of promoting private industry and foreign investment, in which case our assets and operations may be at risk.

Our existing and planned operations in China are subject to risks related to the business, economic and political conditions in China, which include the possibility that the central government of China will change or even reverse its policies of promoting private industry and foreign investment in China. The government of China has exercised and continues to exercise substantial control over virtually every section of the Chinese economy through regulation and state ownership. Many of the current reforms which support private business in China are of recent origin or provisional in nature. Other political, economic and social factors, such as political changes, changes in the rates of economic growth, unemployment or inflation, or in the disparities of per capita wealth among citizens of China and between regions within China, could also lead to further readjustment of the government's reform measures. It is not possible to predict whether the Chinese government will continue to be as supportive of private business in China, nor is it possible to predict how any future reforms will affect our business. For example, if the government were to limit the number of foreign personnel who could work in the country, substantially increase taxes on foreign businesses, eliminate export processing zones, restrict the transportation of goods in and out of the country, adopt policies favoring competitors or impose other restrictions on our operations, the impact may be significant.

Significantly, a reversal of current liberalizations of foreign exchange controls by the Chinese government could be disruptive and costly to our cross- border operations and our business as a whole.

Business practices in China and Korea may entail greater risk and dependence upon the personal relationships of senior management than is common in North America, and therefore some of our agreements with other parties in China and Korea could be difficult or impossible to enforce.

The business cultures of China and Korea are, in some respects, different from the business cultures in Western countries and may present some difficulty for Western investors reviewing contractual relationships among companies in China and Korea and evaluating the merits of an investment. Personal and family relationships among business principals of companies and business entities in China and Korea are very significant in their business cultures. In some cases, because so much reliance is based upon personal relationships, written contracts among businesses in China and Korea may be less detailed and specific than is commonly accepted for similar written agreements in Western countries. In some cases, material terms of an understanding are not contained in the written agreement but exist as oral agreements only. In other cases, the terms of transactions which may involve material amounts of money are not documented at all. In addition, in contrast to Western business practices where a written agreement specifically defines the terms, rights and obligations of the parties in a legally-binding and enforceable manner, the parties to a written agreement in China or Korea may view that agreement more as a starting point for an ongoing business relationship which will evolve and require ongoing modification. As a result, written agreements in China or Korea may appear to the Western reader to look more like outline agreements that precede a formal written agreement. While these documents may appear incomplete or unenforceable to a Western reader, the

parties to the agreement in China or Korea may feel that they have a more complete understanding than is apparent to someone who is only reading the written agreement without having attended the negotiations. As a result, contractual arrangements in China and Korea may be more difficult to review and understand.

China has introduced sweeping reforms to its income tax, turnover tax and other tax laws and regulations. Some of the changes increase the taxes for foreign-invested and other businesses in China will incur on specific types of transactions as well as arising from operations generally in China. Our earnings may be affected by tax adjustments to reflect such changes in the law.

Pursuant to a comprehensive reform of China's tax system that took effect on January 1, 2008, income tax incentives granted to foreign-invested enterprises, and geographically-based incentives, have largely been eliminated and have been replaced with incentives designed to encourage enterprises, domestic and foreign-invested alike, in selected industries. For example, dividends paid by foreign-invested enterprises to foreign shareholders are no longer exempt from withholding tax. A 10% withholding tax applies to dividends, although the rate is reduced to 5% by certain tax treaties. The tax holidays and tax reduction periods and the reduced national income tax rate that foreign- invested enterprises engaged in production used to enjoy have also been removed. The tax incentives promised to our wholly foreign-owned subsidiaries located in export processing zones at the time of inception will be phased-out by the end of 2012. At that time, these subsidiaries and any new foreign-invested enterprises we might establish as part of our strategy to expand the market for our products will no longer have income tax advantages over Chinese domestic businesses.

China's turnover tax system consists of VAT, consumption tax and business tax. VAT is primarily imposed on import and sales of goods and certain services, such as repairing, processing and replacement. Export sales are exempt under VAT rules, and an exporter who incurs VAT on the purchase or manufacture of goods should be able to claim a refund from Chinese tax authorities. Depending on whether VAT export refund rates are raised or reduced for relevant goods, exporters might bear part of the VAT they incurred in conjunction with producing the exported goods. To mitigate the effects of the global economic downturn on China's export industry, the PRC Ministry of Finance and the State Administration of Taxation have raised VAT rebates on numerous exported labor- intensive and high-value-added products. However, the Chinese government may also lower rebate rates in future in response to different economic and policy objectives.

China has also introduced sweeping VAT policy reforms with effect from January 1, 2009, which facilitate China's shift from a production-based VAT scheme to a consumption-based system. Generally, the new system reduces the total output VAT of production enterprises as fixed-asset investment costs related to VAT-eligible output are no longer subject to VAT. However, our VAT costs will depend on our ability to pass on input VAT to our local suppliers and customers. As the relevant VAT law and implementing regulations are new, there may be a period of adjustment before any cost-savings are realized.

Business tax is usually a fee of 3-5 percent levied on services—such as transport, construction, education, finance, and insurance—transfer of intangible assets, and sales of fixed assets, none of which are generally eligible for VAT. Business tax regulations, which took effect January 1, 2009, may impose business on services exchanged among China- and foreign-based entities which previously were not subject to business tax, and the potential overall impact is to increase the tax burden of cross-border service transactions.

Frequent changes to China's tax laws can result in uncertainty and unpredictability in financial results of our operations in China. China's tax laws are supplemented with detailed implementation rules and circulars. However, the interpretation of the rules may vary among local tax authorities.

We are incurring increased costs and demands upon management as a result of complying with the laws and regulations affecting public companies, which could harm our operating results.

As a public company, we are incurring significant additional legal, accounting and other expenses that we did not incur as a private company, including costs associated with public company reporting requirements. We also have incurred and will incur costs associated with current corporate governance requirements, including requirements under Section 404 and other provisions of the Sarbanes-Oxley Act, as well as rules implemented by the Securities and Exchange Commission, or SEC, and the NASDAQ Global Select Market. The expenses incurred by public companies for reporting and corporate governance purposes have increased dramatically in recent years. These rules and regulations to increase our legal and financial compliance costs and to make some activities more time-consuming and costly. These new rules and regulations also make it more difficult and more expensive for us to obtain and maintain director and officer liability insurance, and we may be required to accept reduced policy limits and coverage or incur higher costs to obtain the same or similar coverage previously available. As a result, it may be more difficult for us to attract and retain qualified individuals to serve on our board of directors or as our executive officers.

An active trading market for our common stock may not be sustained, and you may not be able to resell your shares at or above the price at which you purchased them.

We have a limited history as a public company. An active trading market for our shares may not be sustained. In the absence of an active trading market for our common stock, investors may not be able to sell their common stock at or above the price they paid or at the time that they would like to sell.

The market price of our common stock is highly volatile, and we expect it to continue to be volatile for the foreseeable future. For example, from September 24, 2009 through December 31, 2011, our common stock traded at a high price of $28.20 and a low price of $1.51. As a result of this volatility, you may not be able to sell your common stock at or above the price you paid. Some of the factors that may cause the market price of our common stock to fluctuate include:

In addition, if the market for technology stocks or the stock market in general experiences a loss of investor confidence, the trading price of our common stock could decline for reasons unrelated to our business, financial condition or results of operations. If any of the foregoing occurs, it could cause our stock price to fall and may expose us to class action lawsuits that, even if unsuccessful, could be costly to defend and a distraction to management.

We expect that the market value of our convertible notes will be significantly affected by the price of our common stock, which has been and may continue to be highly volatile.

Our common stock has experienced significant price and volume fluctuations. The market price of our common stock, as well as the general level of interest rates and our credit quality, will likely significantly affect the market price of the convertible notes. This may result in significantly greater volatility in the trading value of the convertible notes than would be expected for nonconvertible debt securities we may issue. We cannot predict whether the price of our common stock or interest rates will rise or fall. The market price of our common stock is highly volatile, and we expect it to continue to be volatile for the foreseeable future.

Sales of a significant number of shares of our common stock, or the perception that such sales could occur, could depress the market price of our common stock.

Sales of a substantial number of shares of our common stock in the public market could occur at any time. These sales, or the market perception that the holders of a large number of shares intend to sell shares, could reduce the market price of our common stock. As of December 31, 2011, 8,237,232 shares of our common stock are subject to a one-year contractual lock-up with a stockholder, subject to carve outs for certain hedging transactions.

In connection with our RDO, we agreed to certain 90-day lock-up provisions relating to the issuance of securities which are subject to certain customary carve-outs, including related to certain strategic transactions. Our executive officers and directors have agreed to similar lock-up provisions which provide that they will not, for a period of ninety (90) days after January 19, 2012, without the prior written consent of the placement agent, directly or indirectly offer, sell, assign, transfer, pledge, contract to sell, or otherwise dispose of, any shares of common stock or any securities convertible into or exercisable or exchangeable for common stock, as set forth in the placement agent agreement.

In addition, the existence of the convertible notes may also encourage short selling by market participants because the conversion of the convertible notes could depress our common stock price. The price of our common stock could be affected by possible sales of our common stock by investors who view the convertible notes as a more attractive means of equity participation in us and by hedging or arbitrage trading activity that we expect to occur involving our common stock. This hedging or arbitrage could, in turn, affect the market price of our common stock and the convertible notes.

If securities or industry analysts do not publish or cease publishing research or reports about us, our business or our market, or if they change their recommendations regarding our stock adversely, our stock price and trading volume could decline.

The trading market for our common stock will be influenced by the research and reports that industry or securities analysts may publish about us, our business, our market or our competitors. If any of the analysts who may cover us change their recommendation regarding our stock adversely, or provide more favorable relative recommendations about our competitors, our stock price would likely decline. If any analyst who may cover us were to cease coverage of our company or fail to regularly publish reports on us, we could lose visibility in the financial markets, which in turn could cause our stock price or trading volume to decline.

Our management has broad discretion over the use of our cash reserves and any government grants and loans we may receive, if any, and might not apply this cash in ways that increase the value of your investment.

Our management has broad discretion to use our cash reserves, including the proceeds received from our equity public offerings and our convertible debt offering, and you will be relying on the judgment of our management regarding the application of this cash. Our management might not apply our cash in ways that increase the value of your investment. We expect to use our cash reserves for capital expenditures, including capital expenditures related to the expansion of our manufacturing capacity in Michigan, working capital, and other general corporate purposes, which may in the future include investments in, or acquisitions of, complementary businesses, joint ventures, partnerships, services or technologies. Our management might not be able to yield a significant return, if any, on any investment of this cash. You will not have the opportunity to influence our decisions on how to use our cash reserves.

We do not anticipate declaring any cash dividends to holders of our common stock in the foreseeable future. Consequently, investors may need to rely on sales of their common stock after price appreciation, which may never occur, as the only way to realize any future gains on their investment. Investors seeking cash dividends should not purchase our common stock.

Anti-takeover provisions contained in our certificate of incorporation and bylaws, as well as provisions of Delaware law and provisions governing our convertible notes, could impair a takeover attempt.

Our certificate of incorporation, bylaws and Delaware law contain provisions that could have the effect of rendering more difficult or discouraging an acquisition deemed undesirable by our board of directors. Our corporate governance documents include provisions:

These provisions, alone or together, could delay hostile takeovers and changes in control of our company or changes in our management.

As a Delaware corporation, we are also subject to provisions of Delaware law, including Section 203 of the Delaware General Corporation Law, which prevents some stockholders holding more than 15% of our outstanding common stock from engaging in certain business combinations without approval of the holders of substantially all of our outstanding common stock. Any provision of our amended and restated certificate of incorporation or bylaws or Delaware law that has the effect of delaying or deterring a change in control could limit the opportunity for our stockholders to receive a premium for their shares of our common stock, and could also affect the price that some investors are willing to pay for our common stock.

In addition, if a "fundamental change" occurs pursuant to our convertible notes, holders of the convertible notes will have the right, at their option, to require us to repurchase all or a portion of their convertible notes. In the event of a "make whole adjustment event" under the convertible notes, we may be required to increase the conversion rate applicable to convertible notes surrendered for conversion in connection with such make whole adjustment event. In addition, the indenture governing the convertible notes prohibits us from engaging in certain mergers or acquisitions unless, among other things, the surviving entity assumes our obligations under the convertible notes. These provisions in the indenture governing the convertible notes may have the effect of delaying, deferring or preventing a change in control. These provisions may make it more difficult for other persons, without the approval of our board of directors or a committee thereof, to make a tender offer or otherwise acquire substantial amounts of our common stock or to launch other takeover attempts that a stockholder might consider to be in such stockholder's best interest. These provisions could also limit the price that some investors might be willing to pay in the future for shares of our common stock.

In March, 2011, we moved our corporate headquarters from Watertown, Massachusetts to Waltham, Massachusetts where we lease a facility totaling approximately 97,000 square feet. We use this facility for office, research, lab and light manufacturing space. We also lease approximately 12,500 square feet in Hopkinton, Massachusetts that we use for research and development. In July, 2010, we entered into a lease for approximately 67,000 square feet in Westborough, Massachusetts for office, research and development, assembly, fabrication and warehouse space, which we expanded by an additional 22,000 square feet in December 2011. We also lease research and development facilities in Ann Arbor, Michigan of approximately 17,000 square feet. We also lease a facility in Livonia, Michigan, totaling approximately 291,000 square feet for our new lithium-ion battery manufacturing plant. We also lease approximately 287,300 square feet of office, warehouse and manufacturing space in Romulus, Michigan, which we are in the process of outfitting for manufacturing expansion. We lease approximately 1,500 square feet of office space in St. Louis, Missouri. We also own and lease buildings in Changzhou and Zhenjiang, China, Icheon, Korea and Leinfelden-Echterdingen, Germany for manufacturing, office, lab and support facilities outside of the United States. These facilities total

approximately 627,000 square feet. We believe that our current facilities are sufficient for our current needs. We intend to add new facilities and expand our existing facilities as we add employees and expand our markets, and we believe that suitable additional or substitute space will be available as needed to accommodate any such expansion of our operations.

In 2005 and 2006, we received communications from Hydro-Quebec, a Canadian utility company, alleging that the cathode material of our batteries infringes U.S. Patent No. 5,910,382 and U.S. Patent No. 6,514,640 that had been granted to The University of Texas, or UT, and that relate to certain electrode materials used in lithium-ion batteries. We refer to these patents by the last three digits of the patent number. The '382 and '640 patents include claims that claim to cover battery cathode material having a particular crystal structure and chemical formula. We contended that our cathode material has a different crystal structure and chemical formula.

We believe that UT subsequently licensed the patents to Hydro-Quebec, which in turn licensed the technology to companies that make and sell electrode materials for batteries. On April 7, 2006, we commenced an action in the United States District Court for the District of Massachusetts seeking a declaratory judgment that our products do not infringe these patents and that the patents are invalid. On September 8, 2006, we also requested ex parte reexamination of the two patents by the U.S. Patent & Trademark Office, or PTO, to determine whether the subject matter they claimed is patentable.

On September 11, 2006, Hydro-Quebec and UT commenced an action in the United States District Court for the Northern District of Texas against us, one of our customers, Black & Decker, whom we have agreed to indemnify, and one of our suppliers alleging infringement of the two patents and, in a later amended complaint, false advertising. The plaintiffs' complaint alleged infringement of various claims of the '382 Patent and various claims of the '640 Patent and that we and Black & Decker had engaged in false advertising by making representations about the source and nature of our technology. The complaint sought injunctive relief, including against making, using or selling any product containing the patented technology, actual damages in an unspecified amount, increased and/or treble damages, interest, costs and attorney fees.

In October 2006 and January 2007, the PTO granted our requests for reexamination of the two patents. In January and February 2007, the two litigations in Massachusetts and Texas were stayed pending the PTO reexaminations. During the reexamination, the PTO rejected all of the original claims of the '382 Patent as unpatentable. UT then amended the claims of the '382 Patent to make them narrower than the original claims in order to distinguish the claimed invention from the prior art and added two new and narrower claims. The PTO determined that the narrower amended and new claims of the '382 Patent submitted during reexamination are patentable and concluded the reexamination of the '382 Patent. On April 15, 2008, the PTO issued a reexamination certificate with the amended claims and the two new claims. During the reexamination of the '640 Patent, the PTO rejected all of the original claims of the '640 Patent as unpatentable. UT then amended the claims of the '640 Patent to make them narrower than the original claims in order to distinguish the claimed invention from the prior art. On May 12, 2009, the PTO issued a Certificate of Reexamination for the '640 Patent with the amended narrower claims, thus allowing Hydro-Quebec and UT to assert the narrower claims of the Certificate of Reexamination against any alleged infringer, including us.

On July 22, 2009, Hydro-Quebec and UT sent us a proposed Second Amended Complaint in the Texas litigation, which was filed with the Texas court on August 27, 2009 and we were granted several unopposed extensions to file our response. The Texas court re-opened the case and lifted the stay on October 26, 2009. The Texas court held a hearing with the parties on May 14, 2010 and extended a schedule for the case leading to a claim construction hearing, which was held on December 2, 2010. On

March 29, 2011, the Texas court issued a Memorandum Opinion and Order on Claim Construction. The court issued a scheduling order on April 27, 2011, and trial was set to begin in December 2011. On June 7, 2011, Hydro-Quebec filed a new complaint in the United States District Court for the Northern District of Texas against us and other companies alleging infringement of a newly-issued continuation patent (U.S. Patent No. 7,955,733) to one of the patents in the existing action. Hydro-Quebec then amended this complaint to include three additional continuation patents (U.S. Patent Nos. 7,960,058, 7,964,308, and 7,972,728) that have subsequently issued. We requested reexamination by the PTO of three of the continuation patents in suit. On June 27, 2011, the parties engaged in a court ordered mediation session in New York City before the Honorable John Lifland, a retired federal judge.

On October 31, 2011, we entered into a Settlement Agreement with Hydro-Quebec and UT and related Patent Sublicense Agreement with LiFePO4+C thereby settling the patent disputes and resolving the existing litigations. The parties have agreed to dismiss all litigations, and we were granted a license under the related patents.

Item 5. Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.

Our common stock began trading on the NASDAQ Global Select Market under the symbol "AONE" on September 24, 2009. The following table sets forth the high and low sale prices as reported on the NASDAQ Global Select Market during each of the previous eight quarters.

As of March 5, 2012, we had approximately 149 stockholders of record. We have not paid any cash dividends since inception and do not anticipate paying cash dividends in the foreseeable future. Our credit agreement with Silicon Valley Bank restricts us from paying cash dividends.

Information regarding our equity compensation plans and the securities authorized for issuance thereunder is set forth in our definitive proxy statement to be filed with the Securities and Exchange Commission for our 2012 annual meeting of stockholders under the headings "Security Ownership of Certain Beneficial Owners and Management" and "Securities Authorized for Issuance Under Equity Compensation Plans" and is incorporated herein by reference.

Recent Sales of Unregistered Securities; Use of Proceeds from Registered Securities

On November 3, 2011, we entered into a stock purchase agreement with IHI Corporation in connection with a Technology Licensing Agreement. On November 18, 2011, we issued to IHI Corporation 8,237,232 shares of our common stock for $25.0 million. The issuance of the shares of our common stock to IHI Corporation was done pursuant to an exemption from the registration requirements of the Securities Act in reliance upon Section 4(2) of the Securities Act and Regulation D promulgated thereunder as transaction by an issuer not involving a public offering.

The following Performance Graph and related information shall not be deemed to be "soliciting material" or to be "filed" with the SEC, nor shall such information be incorporated by reference into any future filing under the Securities Act of 1933 or Securities Exchange Act of 1934, each as amended, except to the extent that we specifically incorporate it by reference into such filing.

The graph below matches the cumulative 27-month total return of holders of our common stock with the cumulative total returns of the NASDAQ Composite index and the Dow Jones US Electrical Components & Equipment TSM index. The graph assumes that the value of the investment in the company's common stock and in each of the indexes (including reinvestment of dividends) was $100 on 9/24/2009 and tracks it through 12/31/2011.

COMPARISON OF 27 MONTH CUMULATIVE TOTAL RETURN*
Among A123 Systems, Inc., the NASDAQ Composite Index
and the Dow Jones US Electrical Components & Equipment TSM Index

*$100 invested on 9/24/09 in stock or 8/31/09 in index, including reinvestment of dividends.
Fiscal year ending December 31.

The stock price performance included in this graph is not necessarily indicative of future stock price performance.

You should read the following selected financial data together with our consolidated financial statements and the related notes contained in Item 8 of Part II of this Annual Report on Form 10-K. We have derived the consolidated statements of operations data for each of the three years ended December 31, 2009, 2010 and 2011 and the consolidated balance sheets data as of December 31, 2010 and 2011 from the audited consolidated financial statements contained in Item 8 of Part II of this Form 10-K. The selected consolidated balance sheet data as of December 31, 2007, 2008 and 2009 and the statement of operations data for the year ended 2007 and 2008 have been derived from the audited consolidated financial statements for such years not included in this Form 10-K.

The historical financial information set forth below may not be indicative of our future performance and should be read together with Management's Discussion and Analysis of Financial Condition and Results of Operations and our historical consolidated financial statements and notes to those statements included in Item 7 of Part II and Item 8 of Part II, respectively, of this Annual Report on Form 10-K.

	Year Ended December 31,

Consolidated Statement of Operations Data	2007			2008			2009			2010			2011
	(in thousands)
Revenue:
Product	$	35,504		$	53,514		$	76,519		$	73,826		$	139,080
Services		5,845			15,011			14,530			23,486			20,067

Total revenue		41,349			68,525			91,049			97,312			159,147

Cost of revenue:
Product		38,320			70,474			83,778			94,277			232,092
Services		4,499			10,295			9,963			20,474			17,103

Total cost of revenue		42,819			80,769			93,741			114,751			249,195

Gross profit (loss)		(1,470	)		(12,244	)		(2,692	)		(17,439	)		(90,048	)

Operating expenses:
Research, development and engineering		13,241			36,953			48,286			60,723			76,925
Sales and marketing		4,307			8,851			8,455			14,111			16,808
General and administrative		13,336			21,544			24,480			36,053			45,132
Production start-up		—			—			1,524			21,064			9,221

Total operating expenses		30,884			67,348			82,745			131,951			148,086

Operating loss		(32,354	)		(79,592	)		(85,437	)		(149,390	)		(238,134	)
Other income (expense):
Interest income		1,729			1,258			165			135			19
Interest expense		(716	)		(812	)		(1,206	)		(1,430	)		(7,357	)
Gain (loss) on foreign exchange		502			(724	)		682			(560	)		3
Unrealized loss on preferred stock warrant liability		(57	)		(286	)		(515	)		—			—
Impairment of long-term investment		—			—			—			—			(11,612	)
Other (expense) income, net		—			—			—			(849	)		691

Total other expense, net		1,458			(564	)		(874	)		(2,704	)		(18,256	)

Loss from operations, before tax		(30,896	)		(80,156	)		(86,311	)		(152,094	)		(256,390	)
Provision for income taxes		97			275			278			843			1,367

Net loss		(30,993	)		(80,431	)		(86,589	)		(152,937	)		(257,757	)
Less: net loss (income) attributable to the noncontrolling interest		27			(39	)		810			377			27

Net loss attributable to A123 Systems, Inc.		(30,966	)		(80,470	)		(85,779	)		(152,560	)		(257,730	)
Accretion to preferred stock		(35	)		(42	)		(45	)		—

Net loss attributable A123 Systems, Inc. common stockholders	$	(31,001	)	$	(80,512	)	$	(85,824	)	$	(152,560	)	$	(257,730	)

	As of December 31,

	2007			2008			2009		2010		2011
	(in thousands)
Consolidated Balance Sheet Data:
Cash and cash equivalents	$	23,359		$	70,510		$	457,122	$	216,841	$	186,893
Working capital		30,727			69,345			470,424		191,892		233,302
Total assets		105,146			208,960			618,090		576,158		625,902
Preferred stock warrant liability		664			950			—		—		—
Long-term debt, including current portion		6,071			10,522			13,894		9,982		144,824
Capital lease obligations, including current portion		1,121			684			604		20,226		19,076
Redeemable convertible preferred stock		132,914			234,954			—		—		—
Redeemable common stock		—			11,500			—		—		—
Total A123 Systems, Inc. stockholders' (deficit) equity		(62,603	)		(133,428	)		528,220		398,198		296,365

Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations.

The following discussion and analysis of our financial condition and results of operations should be read in conjunction with our consolidated financial statements and the related notes thereto and other financial information included elsewhere in this Annual Report on Form 10-K.

We design, develop, manufacture and sell advanced, rechargeable lithium-ion batteries and battery systems. Our target markets are the transportation, electric grid services, commercial and government markets.

We market and sell our products primarily through a direct sales force. In the transportation market, we are focusing sales of our batteries and battery systems to automotive and heavy duty vehicle manufacturers either directly or through tier 1 suppliers. We work with automotive and heavy duty vehicle manufacturers directly to educate and inform them about the benefits of our technology for use in hybrid electric vehicles, or HEVs, plug-in hybrid electric vehicles, or PHEVs and electric vehicles, or EVs, and are engaged in design and development efforts with several automotive and heavy duty vehicle manufacturers and tier 1 suppliers. At the same time, we work with tier 1 suppliers who are developing integrated solutions using our batteries. In the electric grid services market, our sales have been initiated directly by our sales force, but we anticipate the involvement of certain channel partners as our business grows. In the commercial market, our sales are made both directly and indirectly through distributors with key accounts managed by our sales personnel. For the government market, we are focusing sales of our products either directly or through tier 1 defense contractors. We expect to continue to expand our sales presence in Europe and Asia as our business in those regions continues to grow. We expect international markets to provide increased opportunities for our products. We have entered into exclusive agreements to license certain of our technologies in particular markets and expect to receive royalty fees on net sales of licensed products that include our technology.

Our sales cycles vary by product and market segment. Most of our batteries and battery systems typically undergo a lengthy development and qualification period prior to commercial production. We expect that the total time from customer introduction to commercial production will range up to five years depending on the specific product and market served. Our long and unpredictable sales cycles and the potential large size of battery supply and development contracts cause our period-to-period financial results to be susceptible to significant variability. Since most of our operating and capital expenses are incurred up-front based on the anticipated timing of estimated design wins and customer orders, the loss or delay of any such orders could have a material adverse effect on our results of operations for any particular period. The variability in our period-to-period results will also be driven by likely period-to-period variations in product mix and by the seasonality experienced by some of the end markets into which we sell our products. In the electric grid market, revenue recognition will be volatile due to the timing of deployment, delivery, and commissioning. As such, the timing of these events will significantly affect the comparison of period-to-period revenues.

We have been expanding our manufacturing capacity since inception, including the recent expansion of our Livonia and Romulus, Michigan facilities. We now have adequate capacity in place to meet customer requirements in the near term and we continue expansion of our manufacturing capacity only as necessitated by actual and anticipated future demand for our products. Our up-front investments in manufacturing capacity negatively impact earnings and cash balances in the near term, but we expect these investments will increase our revenue and profitability in the long term.

Our research and development efforts are focused on developing new products and improving the performance of existing products. We fund our research and development initiatives both from internal and external sources. As part of our development strategy, certain customers fund, or partially fund

research and development efforts to design and customize batteries and battery systems for their specific application.

We have experienced significant losses since inception, as we have continued to invest to support the growth in our business. In particular, we have invested in product development and sales and marketing in order to meet product requirements of our target markets and to secure design wins that are expected to lead to strong revenue growth and in general and administrative overhead to develop the infrastructure to support the business. We have also invested in the expansion of our manufacturing capacity to meet anticipated demand and our battery systems capabilities to provide battery systems solutions to our customers. As our business grows, the key factors to improving our financial performance will be revenue growth and revenue diversification across the markets that we serve. Our revenue growth and revenue diversification will depend on our ability to win new business as well as our customers' abilities to achieve their sales plans and business objectives. Higher revenue will increase gross margin, as higher production volumes will provide for increased absorption of manufacturing overhead and will reduce, on a percentage basis, the costs associated with our production capacity. Further, our revenue growth will allow us to maintain liquidity sufficient to operate our business effectively.

To fund our growth over the near term, including anticipated future losses, purchase commitments, and capital expenditures, we are taking actions to reduce the cash used in operating and investing activities including plans to improve our gross margins, reduce our operating expenses and increase inventory turns. However, we may also choose to raise additional capital to fund cash requirements through expansion of the existing line of credit, additional strategic partnerships, or accessing the capital markets from time to time.

Although our goal is to improve our operating efficiencies and to obtain additional financing through new partnerships, there is no guarantee that we will be able to achieve such expected improvements in operating performance or that we will be able to obtain such external funding.

In December 2009, we executed an agreement with the DOE regarding the terms and conditions of the $249.1 million grant awarded under the DOE's Battery Initiative to fund the construction of new lithium-ion battery manufacturing facilities in Michigan. The term of the award ends on November 30, 2012. Under the DOE Battery Initiative, we are required to spend up to one dollar of our funds for every incentive dollar received. Through December 31, 2011, we have received $127.0 million in reimbursement for costs incurred. As of December 31, 2011, we have incurred additional allowable costs entitling us to receive $0.8 million in reimbursements, which has been recorded as a receivable. Our contract with the DOE will expire on December 4, 2012. We have requested to extend the expiration date to December 31, 2014. Our request is under review.

We have made a loan application under the Advanced Technology Vehicles Manufacturing Loan Program, or the ATVM Program, to support our continued manufacturing expansion. Based on the amount of our grant award under the DOE Battery Initiative and the guidelines associated with the ATVM Program, we believe we will be permitted to borrow up to $233 million under the ATVM Program. We expect we will be required to spend one dollar of our own funds for every four dollars we borrow under the ATVM Program. The timing and the amount of any loan we may receive under the ATVM Program, as well as the specific terms and conditions applicable to any loan we may receive are currently not known by us, and, once disclosed to us, are subject to change and negotiation with the federal government.

In October 2009, we entered into a High-Tech Credit agreement with the Michigan Economic Growth Authority, or MEGA, pursuant to which we are eligible for a 15-year tax credit, beginning with payments made for the 2011 fiscal year. In November 2009, we entered into a Cell Manufacturing Credit agreement with MEGA pursuant to which we are eligible for a credit equal to 50% of our capital investment expenses commencing January 2009, up to a maximum of $100 million over a four-year

period related to the construction of our integrated battery cell manufacturing plant. The tax credit proceeds shall not exceed $25 million per year beginning with the tax year of 2012. We are required to create 300 jobs no later than December 31, 2016 in order for the tax credit proceeds to be non-refundable. The tax credit is subject to a repayment provision in the event we relocate 51% or more of the 300 jobs outside of the State of Michigan within three years after the last year we received the tax credit. Through December 31, 2011 we have incurred expenses of $200.0 million in qualified expenses related to the construction of the Livonia and Romulus facilities. When we have met the filing requirements for the tax year ending December 31, 2012, we expect to begin receiving $100.0 million in proceeds related to these expenses limited to $25.0 million per year over a four year period. We have recorded a receivable of $75.8 million and $100.0 million, as of December 31, 2010 and 2011, respectively, as it is reasonably assured that we will comply with the conditions of the tax credit and will receive proceeds. Upon recording the receivable, we reduced the basis in the fixed assets acquired in accordance with the tax credit and this will be recognized in the consolidated statements of operations over their estimated useful lives of the depreciable asset as reduced depreciation expense.

To fund our growth and expansion plans, during April 2011, we raised a total of $253.9 million of net proceeds from the issuance of $143.8 million in principal of convertible unsecured subordinated notes and the issuance of 20.2 million shares of our common stock at $6.00 per share. In September 2011, we entered into a credit agreement providing us with a revolving loan facility in the amount of $40.0 million.

In November, 2011, we entered into a series of agreements with IHI Corporation pursuant to which, among other things, we raised $25.0 million through the sale of common stock to IHI and in January 2012, we raised $25.4 million through the issuance of 12,500,000 shares of our common stock in a registered direct offering. We will have the option, subject to certain conditions, to require the purchase of up to an additional 6,250,000 shares of our common stock during each of two exercise periods in June and July, 2012. If such conditions are not able to be satisfied during each option period, we will not be able to require the investor to purchase the additional shares and we will receive no proceeds therefrom.

On October 31, 2011, we entered into a Settlement Agreement with Hydro-Quebec and related Patent Sublicense Agreement with Hydro-Quebec and LiFePO4+C, thereby settling the patent disputes and resolving the existing litigations among the parties. For the year ended December 31, 2011, we recognized a settlement charge of $5.0 million related to this lawsuit which is recorded within general and administrative expense in the consolidated statement of operations. We have paid $3.5 million of the settlement amount during the year ended December 31, 2011 and the remaining $1.5 million will be paid in two equal installments in 2013 and 2014.

Recently, in February 2012, as part of our continuing efforts to reduce expenses and strengthen our operations, we have decided to close down our facility in Korea while relocating a portion of our new product development and advanced manufacturing engineering teams to other facilities. Our need to align our manufacturing capacity with near-term customer demand and our need to reduce operating expenses are the key factors that drove the decision to restructure. We expect to complete the shutdown of our Korean facility during the first half year of 2012.

Product Revenue. Product revenue is derived from the sale of our batteries and battery systems. For the years ended December 31, 2010 and 2011, product revenue represented 76% and 87% of our total revenue, respectively.

During the year ended December 31, 2011, a significant portion of our revenue was generated from a limited number of customers. Our two largest customers (Fisker Automotive, Inc. or Fisker and AES Energy Storage, LLC and its affiliates, or AES) each accounted for approximately 26% and 24% of our total revenue during the year ended December 31, 2011, respectively. In 2012, we expect that our revenue sources will be somewhat more diverse as more of our automotive customers ramp up production and as we continue to grow our business in the grid and commercial markets, but a significant portion of our revenue will still come from a relatively small number of customers for the foreseeable future. The loss of one or more of those customers could have a material adverse effect on our short-term revenue. We expect the transportation market and the electric grid market to represent the largest portion of our revenue in the near and long term.

Services Revenue. Services revenue is primarily derived from contracts awarded by the U.S. federal government, other government agencies and commercial customers. These activities range from pure research, in which we investigate design techniques on new battery technologies at the request of a government agency or commercial customer, to custom development projects in which we are paid to enhance or modify an existing product or develop a new product to meet a customer's specifications. We expect to continue to perform funded research and development work and to use the technology developed to advance our new product development efforts. We expect that revenue from services will vary period-to-period depending on the amount of costs incurred, the timing of when we are entitled to payments or, if applicable, the achievement of milestones. We expect that services revenue will decrease as a percentage of our total revenue due to the expected increase in product revenue over the long-term.

Deferred Revenue. We record deferred revenue for product sales and services in several different circumstances. These circumstances include (i) the products have been delivered or services have been performed but other revenue recognition criteria have not been satisfied (ii) payments have been received in advance of products being delivered or services being performed and (iii) when all other revenue recognition criteria have been met, but we are not able to reasonably estimate the warranty expense. Deferred revenue expected to be recognized as revenue more than one year subsequent to the balance sheet date is classified as long-term deferred revenue. Deferred revenue will vary depending on the timing and amount of cash receipts from customers and can vary significantly depending on specific contractual terms. As a result, deferred revenue is likely to fluctuate from period-to-period. We have received and recorded as deferred revenue a total of $28.0 million in up-front, support and additional payments in connection with our license agreement with Gillette. In addition, the agreement requires Gillette to pay us royalty fees on net sales of products that include our technology. We have agreed with Gillette that if, during a certain period following execution of the license agreement, we enter into an agreement with a third party that materially restricts Gillette's license rights under the license agreement, then we may be required to refund to Gillette all license and support fees paid to us by Gillette under the license agreement, plus, in certain cases, an additional amount to cover Gillette's capital and other expenses paid and/or committed by Gillette in reliance upon its rights under the license agreement. Revenue recognition commenced during the second quarter of 2011 upon successful transfer of technology know-how to Gillette. The license and support fee will be recognized on a straight-line basis over the longer of the patent term or the expected customer relationship. As of December 31, 2011, deferred revenue related to the license and support fee is $27.0 million.

In November, 2011, we entered into a technology license agreement with IHI Corporation to exclusively license our advance battery system technology and systems integration know-how to manufacture battery systems and modules for the transportation market in Japan. We received a one-time non-refundable fee of $7.5 million in connection with this license agreement. During the license term of ten years, we will also receive royalty payments based on a percentage of the licensee's net sales of products that use or embody the licensed technology and know-how. We recorded the

upfront license fee of $7.5 million in deferred revenue as of December 31, 2011. Revenue on the license fee will be amortized over the license term expected to commence in 2012.

Customer Deposits. Customer deposits received from customers related to products where title has not passed are recorded in other liabilities. We classify as long-term the portion of customer deposits that are expected to be recognized beyond one year. Upon transfer of title and when all of the revenue recognition criteria have been met, we recognize the related revenue. If not all of the revenue recognition criteria have been met, but title to the goods has passed to the customer, we record the related amount in deferred revenue. As of December 31, 2010 and 2011, the Company recorded customer deposits of $6.2 million and $6.9 million in other current liabilities, respectively.

Cost of product revenue includes the cost of raw materials, labor and components that are required for the production of our products, as well as manufacturing overhead costs (including depreciation), inventory obsolescence charges, and warranty costs. Raw material costs, which are our most significant cost item over the past two years, have historically been stable, but these costs are subject to macroeconomic factors and may increase in the future. Increases may be partially offset by process innovation, dual sourcing of materials and increased volume if we achieve better economies of scale. We incur costs associated with unabsorbed manufacturing expenses prior to a factory operating at normal operating capacity. We expect these unabsorbed manufacturing costs, which include certain personnel, rent, utilities, materials, testing and depreciation costs, to begin to fall in absolute dollars and as a percentage of revenue from present levels as our production ramps up over the course of 2012.

Cost of services revenue includes the direct labor costs of engineering resources committed to funded service contracts, as well as third-party consulting, and associated direct material and equipment costs. Additionally, we include overhead expenses such as occupancy costs associated with the project resources, engineering tools and supplies and program management expense.

Our gross profit (loss) is affected by a number of factors, including the mix of products sold, customer diversification, the mix between product revenue and services revenue, average selling prices, foreign exchange rates, our actual manufacturing costs and costs associated with increasing production capacity until full production is achieved. As we continue to grow and build out our manufacturing capacity, and as new product designs come into production, our gross profit will continue to fluctuate from period-to-period.

We have expanded our capacity to meet anticipated customer demand, including building out additional manufacturing capacity at our Livonia and Romulus, Michigan facilities. During 2011, our worldwide manufacturing capacity increased from 345 MWh in 2010 to 646 MWh. In the third quarter of 2011, we qualified the second production line at our Livonia facility, and we qualified our Romulus facility in the fourth quarter of 2011. Also, we have put into place manufacturing overhead, including supply chain and quality organizations, which are sized to support significantly higher production volumes than we are currently producing. Increasing our production volume will allow us to reduce per-unit cell costs, improve the absorption of manufacturing overhead costs, and improve our gross margins.

However, though our Michigan facilities are now operational, these facilities are not yet operating at their yield and uptime targets, and we incurred significant additional expenditures and production losses as part of launching these facilities. As production volumes increase, equipment performance improves, our supply base matures and design changes are incorporated into our cells, we anticipate a steady improvement in our margins.

Our long-term financial objective is to achieve and support sustained profitable growth. To meet this objective, we are currently focusing on increasing production volumes to achieve lower material costs due to volume purchase discounts and improved absorption of our manufacturing overhead costs, thereby reducing per-unit production cost.

Operating expenses consist of research, development and engineering, sales and marketing, general and administrative and production start-up expenses. Personnel-related expenses comprise the most significant component of these expenses. We have hired a significant number of new employees in order to support our anticipated growth. In any particular period, the timing of additional hires could materially affect our operating expenses, both in absolute dollars and as a percentage of revenue. During the third quarter of 2010, we opened our manufacturing facility in Livonia, Michigan, and the first production line in our Livonia facility was qualified for production in December 2010 while the second production line in our Livonia facility was qualified in July 2011. The Romulus facility began qualification for production in the first quarter of 2011 and was qualified in the fourth quarter of 2011. With our production start-up expenses largely behind us, we expect the rate of increase in operating expenses to moderate in the near term.

Research, Development and Engineering Expenses. Research, development and engineering expenses consist primarily of expenses for personnel engaged in the development of new products and the enhancement of existing products, as well as lab materials, quality assurance activities and facilities costs and other related overhead. These expenses also include pre-production costs related to long-term supply agreements unless reimbursement from the customer is contractually guaranteed. Pre-production costs consist of engineering, design and development costs for products sold under long-term supply arrangements. We expense all of our research, development and engineering costs as they are incurred. In the near term, we expect research, development and engineering expenses to increase modestly as we continue to invest in the development of our products. Research, development and engineering expense is reported net of any funding received under contracts with governmental agencies and commercial customers that are considered to be cost sharing arrangements with no contractually committed deliverable. Accordingly, we expect that our research, development and engineering expenses will continue to increase in absolute dollars but decrease as a percentage of revenue in the long term.

Sales and Marketing Expenses. Sales and marketing expenses consist primarily of personnel-related expenses, travel and other out-of-pocket expenses for marketing programs, such as trade shows, industry conferences, marketing materials and corporate communications, and facilities costs and other related overhead. We intend to hire additional sales personnel, initiate additional marketing programs and build additional relationships with resellers, systems integrators and strategic partners on a global basis. Accordingly, we expect that our sales and marketing expenses will continue to increase in absolute dollars but decrease as a percentage of revenue in the long term.

General and Administrative Expenses. General and administrative expenses consist primarily of personnel-related expenses related to our executive, legal, finance, human resource and information technology functions, as well as fees for professional services and allocated facility overhead expenses. Professional services consist principally of external legal, accounting, tax, audit and other consulting services. We expect to continue to incur general and administrative expenses related to operating as a publicly-traded company, including increased audit and legal fees, costs of compliance with securities, corporate governance and other regulations, investor relations expenses and higher insurance premiums. In addition, we expect to incur additional costs as we hire personnel and enhance our infrastructure to support the anticipated growth of our business. Accordingly, we expect that our

general and administrative expenses will continue to increase in absolute dollars but decrease as a percentage of revenue in the long term.

Production Start-up Expenses. Production start-up expenses consist of salaries and personnel-related costs, site selection costs, including legal and regulatory costs, rent and the cost of operating a production line before it is qualified for production, including the cost of raw materials run through the production line during the qualification phase. The Livonia facility began qualification for production in the third quarter of 2010 and the first production line was qualified in December 2010 while the second production line was qualified in July 2011. The Romulus facility began qualification for production in the first quarter of 2011 and was qualified in October 2011. With that, we anticipate that our production start-up expenses will decrease in the near term.

Other Income (Expense), Net. Other income (expense), net consists primarily of interest income on cash balances, interest expense on borrowings, change in fair value of preferred stock warrants, foreign currency-related gains and losses, equity earnings and gain or losses on long-term investments. We have historically invested our cash in money market investments. Our interest income will vary each reporting period depending on our average cash balances and the interest rates during the period. Similarly, our foreign currency-related gains and losses will also vary depending upon movements in underlying exchange rates. Other income includes equity losses related to our proportional share of earnings in investments accounted for under the equity method and will vary each reporting period depending on the earnings or losses of these entities and gains or losses on long-term investments will vary each reporting period depending on the timing of any joint ventures or other equity investments we may enter into, the investment made by us, and the ongoing operations of the investee.

Provision for Income Taxes. Through December 31, 2011, we incurred net losses since inception and have not recorded provisions for U.S. federal income taxes since the tax benefits of our net losses have been offset by valuation allowances.

We have recorded a tax provision for foreign taxes associated with our foreign subsidiaries and state income taxes where our net operating loss deductions are limited by statutes.

The following represents a summary of certain trends and uncertainties, which could have a significant impact on our financial condition and results of operations. This summary is not intended to be a complete list of potential trends and uncertainties that could impact our business in the long or short term. The summary, however, should be considered along with the factors identified in the section titled Risk Factors set forth in Part I, Item 1A of this Annual Report on Form 10-K and elsewhere in this report.

Our discussion and analysis of our financial condition and results of operations are based upon our consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States of America. The preparation of these financial statements requires us to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenue, expense and related disclosures. We base our estimates and assumptions on historical experience and on various other factors that we believe to be reasonable under the circumstances. We evaluate our estimates and assumptions on an ongoing basis. Our actual results may differ from these estimates under different assumptions or conditions.

We believe the following critical accounting policies affect our more significant judgments and estimates used in the preparation of our financial statements.

We recognize revenue once it is realized or realizable and earned when all of the following criteria are met: persuasive evidence of an arrangement exists, delivery has occurred or services have been rendered, the price to the buyer is fixed or determinable, and collectability is reasonably assured. In instances where final acceptance of the product is specified by the customer, revenue is deferred until all acceptance criteria have been met.

Product revenue is generally recognized upon transfer of title and risk of loss, which is generally upon shipment, unless an acceptance period or other contingency exists. In general, our customary shipping terms are FOB shipping point or free carrier. In instances where customer acceptance of a product is required, revenue is either recognized upon the shipment when we are able to demonstrate the customer specific objective criteria have been met or the earlier of customer acceptance or expiration of the acceptance period.

Services revenue is recognized as services are performed consistent with the performance requirements of the contract using the proportional performance method. Where arrangements include milestones or governmental approval that impact the fees payable to us, revenue is limited to those amounts whereby collectability is reasonably assured. We recognize revenue earned under time and materials contracts as services are provided based upon actual costs incurred plus a contractually agreed-upon profit margin. We recognize revenue from fixed-price contracts, using the proportional performance method based on the ratio of costs incurred to estimates of total expected project costs in order to determine the amount of revenue earned to date. Project costs are based on the direct salary and associated fringe benefits of the employees on the project plus all direct expenses incurred to complete the project that are not reimbursed by the client. The proportional performance method is used since reasonably dependable estimates of the revenues and costs applicable to various stages of a contract can be made. These estimates are based on historical experience and deliverables identified in the contract and are indicative of the level of benefit provided to our clients. Under the proportional performance method, there are no costs that are deferred and amortized over the contract term. If we

do not have the ability to reasonably estimate contract costs or progress toward completion of the contract, we defer the related revenue and costs and recognize the revenues and costs based on the completed contract method. When the completed contract method is used, the excess of accumulated costs over related billings, if any, are classified as an asset and the excess of accumulated billings over related costs, if any, are classified as a liability. We classify the portion of the related asset or liability as long-term if such asset or liability are expected to be recognized beyond one year.

If sales arrangements contain multiple elements, we determine if separate units of accounting exist within the arrangement. If separate units of accounting exist within an arrangement, we allocate revenue to each element based on the relative selling price of each of the elements. We determine selling price using vendor-specific objective evidence or VSOE, if it exists; otherwise, we use third-party evidence or TPE. If neither VSOE nor TPE of selling price exists for a unit of accounting, we use the estimated selling price.

Fees to license the use of our proprietary and licensed technologies are recognized only after both the license period has commenced and the technology has been delivered to the customer. Royalty revenue is recognized when it becomes determinable and collectability is reasonably assured; otherwise we recognize revenue upon receipt of payment. To date, we have not recognized any material license or royalty revenue.

Because of the nature of our products, revenue recognition is based on a number of quantitative and qualitative factors. This can lead to significant fluctuations in our quarterly and annual revenues.

We accrue for product warranty costs at the time revenue is recognized based on the historical rate of claims and costs to provide warranty services. Our standard warranty period extends one to five years from the date of sale, depending on the type of product purchased and its application. Our estimates of the amounts necessary to settle warranty claims are based primarily on our past experience. For our new products and products that remain under development, we will be required to base our warranty estimates on historical experience of similar products, testing of our batteries and battery systems, and performance information learned during our development activities with the customer. Although we believe our estimates are adequate and that the judgment we apply is appropriate, actual warranty costs could differ materially from our estimates. If we experience an increase in warranty claims above historical experience or our costs to provide warranty services increase, we would be required to increase our warranty accrual, and our cost of revenue would increase. If we are unable to estimate warranty costs we would defer recognizing revenue until we can make that determination.

We carry our inventory at the lower of historical cost or net realizable value assuming inventory items are consumed on a first-in, first-out basis. We recognize inventory losses based on obsolescence and levels in excess of forecasted demand. In these cases, inventory is written down to the estimated realizable value based on historical usage and expected demand. Inherent in our estimates of market value in determining inventory valuation are estimates related to economic trends, future demand for our products and technical obsolescence of our products. If future demand or market conditions are less favorable than our projections, additional inventory write-downs could be required and would be reflected in the cost of revenue in the period the revision is made.

We periodically evaluate our long-lived assets for events and circumstances that indicate a potential impairment. We review long-lived assets for impairment whenever events or changes in business circumstances indicate that the carrying amount of the assets may not be fully recoverable or that the useful lives of these assets are no longer appropriate. Such circumstances would include, but are not limited to, material adverse changes in projected revenues and expenses, significant underperformance relative to historical or projected future operating results and significant negative industry or economic trends. Each impairment test is based on a comparison of the estimated undiscounted cash flows of the asset or asset group over the remaining life of the asset as compared to the recorded value of the asset. To the extent the carrying value exceeds the fair value of the asset or asset group, an impairment loss is recognized in the statement of operations in that period.

The estimates used to determine whether impairment has occurred are subject to a number of management assumptions. We group long-lived asset or assets with other assets and liabilities at the lowest level for which identifiable cash flows are available. We estimate the fair value of an asset or asset group based on market prices (i.e., the amount for which the asset could be bought by or sold to a third party), when available. When market prices are not available, we estimate the fair value of the asset group using the income approach, which are subject to a number of management assumptions. The income approach uses cash flow projections. Inherent in our development of cash flow projections are assumptions and estimates derived from a review of our operating results, approved operating budgets, expected growth rates and cost of capital. We also make certain assumptions about future economic conditions, interest rates, and other market data. Many of the factors used in assessing fair value are outside the control of management, and these assumptions and estimates can change in future periods.

Changes in assumptions or estimates could materially affect the determination of fair value of an asset or asset group, and therefore could affect the amount of potential impairment of the asset. We make assumptions about our product production, service sales, cost of products and services and estimated residual value of property, plant and equipment. These assumptions are key inputs for developing our cash flow projections. These projections are derived using our internal operating budgets. These projections are updated annually and reviewed by the Board of Directors. Historically, our primary variances between our projections and actual results have been related to assumptions for future production, service sales, and cost of products and services. These factors are based on our best knowledge at the time we prepare our budgets but can vary significantly due to changes in supply and demand, changes in raw material prices, and changes in other economic conditions.

As a result of the continued decline in revenue from our Korean subsidiary , we reviewed our long-lived assets associated with the production of small prismatic batteries and recorded $0, $0.3 million, and $1.6 million of impairment charges in the years ended December 31, 2009, 2010 and 2011, respectively. During the years ended December 31, 2009, 2010 and 2011, we recorded $0.7 million, $0.1 million and $2.6 million, respectively, of impairment charges related to impaired equipment at our China facility.

Goodwill is not amortized, but is subject to periodic assessments of impairment. Impairment testing is performed at the reporting unit level, which we only have one reporting unit. We test goodwill for impairment annually as of October 1, or when changes in circumstances indicate that the carrying value may not be recoverable. Events that trigger a test for recoverability include material adverse changes in projected revenues and expenses, significant underperformance relative to historical or projected future operating results and significant negative industry or economic trends.

We test goodwill for impairment by first comparing the book value of net assets to the fair value of operations. We calculate the fair market value by adding a control premium to our market capitalization at the date of the evaluation. The control premium is based on recent equity transactions within our industry. If the fair value is determined to be less than book value, a second step is performed to compute the amount of the impairment. In this process, a fair value for goodwill is estimated, based in part on the fair value of the operations, and is compared to its carrying value. The shortfall of the fair value below carrying value represents the amount of goodwill impairment. The estimates used to determine whether goodwill impairment has occurred are subject to a number of management assumptions.

We completed our assessment of goodwill during fourth quarter 2011, and determined that the estimated fair value of operations exceeded the carrying value. As of December 31, 2011, an approximate 10% decrease in the estimated fair value of our operations would result in a full impairment of goodwill.

Any decreases in our stock price or control premium could result in goodwill impairment charges in future periods.

We recognize government grants when there is a reasonable assurance that we will comply with the conditions attached to the grant arrangement and the grant will be received. We evaluate the conditions of each individual grant as of each reporting period to ensure that we have reached reasonable assurance of meeting the conditions of each grant arrangement and that it is expected that the grant will be received as a result of meeting the necessary conditions. For example, if a grant has conditions where we must create and maintain a certain amount of jobs, we will record the grant in the period that we have evaluated and determined that the necessary number of jobs has been created and, based on our forecasts, we are reasonably assured that the jobs will be maintained during the required employment period. For reimbursements of expenses, the government grants are recognized as reduction of the related expense. For reimbursements of capital expenditures, the grants are recognized as a reduction of the basis of the asset. The grant is recognized in profit or loss over the life of a depreciable asset as reduced depreciation expense. We record government grant receivables in current or long-term assets depending on when the amounts are expected to be received from the government agency. We do not discount long-term grant receivables. When funding is received in advance of complying with certain conditions, we recognize a liability and restricted cash on the consolidated balance sheets until such time as the funding has been spent.

Our investments held in non-public companies are considered a critical accounting policy because these investments expose us to equity price risk. Strategic investments in third parties are subject to risk of changes in market value, which if determined to be other-than-temporary, could result in realized impairment losses, which could be material. We generally do not attempt to reduce or eliminate our market exposure in cost or equity method investments. We regularly monitor these non-publicly traded investments for impairment and record reductions in the carrying values when necessary. Circumstances that indicate an other-than-temporary decline include valuation ascribed to the issuing company in subsequent financing rounds, decreases in quoted market price and declines in operations of the issuer. There can be no assurance that cost or equity method investments will not face risks of loss. During the year ended December 31, 2011, we elected not to participate in Fisker's subsequent stock financing. Our investment in Fisker is accounted for under the cost method. This election not to participate resulted in the conversion of our preferred shares of Fisker to common shares on a 2:1 ratio. As such, we performed an analysis and valuation of our investment in Fisker resulting in the recognition of an impairment charge of $11.6 million for the year ended December 31, 2011. As of December 31, 2011,

the carrying value of our investment in Fisker was $8.9 million. As of December 31, 2011, non-publicly traded investments of $3.0 million are accounted for using the equity method.

The following table sets forth the results of our operations as a percentage of revenue for each of the following periods:

Product Revenue. The increase in sales in the transportation industry of $40.6 million for the year ended December 31, 2011 compared to the year ended December 31, 2010 was primarily due to the transition of one of our significant customers to volume production and our delivery against the supply agreement with this customer. Additionally, the transition of several of our other customers from development programs to prototype production programs, corresponded to an increase in sales to these customers. These increases were partially offset by a decrease of $17.3 million in sales to one of our existing production stage transportation customers. We expect sales to this customer to decrease as a percentage of transportation revenue as revenues from other customers increase. The sales in the commercial industry for the year ended December 31, 2011 compared to the year ended December 31, 2010, were consistent.

The increase in sales in the electric grid industry of $23.9 million for the year ended December 31, 2011 compared to the year ended December 31, 2010 is driven by the timing of demand from our existing production customers. Most of our electric grid products involve project-based contracts with multiple elements in which there are separate units of accounting within the arrangement. The timing of when we complete the required deliverables for the units of accounting and when all other revenue recognition criteria are met, may cause some variability in the timing of revenue recognition. We anticipate that revenue recognition in the electric grid market for future periods will continue to be volatile due to the timing of deployment, delivery and commissioning of systems.

Services Revenue. The decrease in services revenue is primarily attributable to a $7.4 million decrease in services revenue related to a significant government contract awarded in January 2010. A substantial portion of this significant government contract was completed during the year ended December 31, 2010 with no similar work required during the year ended December 31, 2011. This decrease is offset by an increase in services revenue of $3.6 million from a development contract with a non-government customer that commenced in 2010 and a $0.4 million increase in services revenue related to the mix of government and non-government contracts and the timing of development milestones.

Cost of Product Revenue. The increase in cost of product revenue was primarily due to an increase in product revenues, higher inventory charges and other period expenses incurred in 2011, and a change in the mix of products sold during the year ended December 31, 2011 which included a higher product shipments ratio of prismatic cell products to cylindrical cells of 19% as compared to 2% during the year ended December 31, 2010. The higher inventory charges consisted primarily of $8.0 million in inventory write-offs due to prismatic cells and modules that failed to meet specifications as well as an increase in our warranty charges. Warranty cost increased from 3% of product revenue in 2010 to 12% of product revenue in 2011 due to $7.6 million in specific warranty event charges as well as an increase in our general warranty provision. During the year ended December 31, 2011, we were in the process of qualification and production ramp-up at our Livonia and Romulus, Michigan facilities. Our prismatic cell costs are currently higher as these facilities are not yet operating at their yield and uptime targets and we have incurred significant extra expenses, a portion of which are included in production start-up expenses, to launch these facilities on a compressed timeline.

Additionally, we are currently incurring higher costs as we purchase certain raw materials at low volumes. As our production volumes of prismatic have increased, our material costs have begun to decrease as we benefit from volume purchase discounts. Due to low factory utilization, unabsorbed manufacturing expenses were $20.6 million for the year ended December 31, 2010, compared to

$45.0 million for the year ended December 31, 2011. The increase in unabsorbed manufacturing expenses was due to the increase in capacity brought online in Michigan late in 2010 combined with the fact that production volumes for customer agreements did not begin to increase until the second quarter of 2011. As production volumes increase and our manufacturing process matures, we anticipate reduced per-unit costs through improved absorption of manufacturing overhead, improved labor efficiencies, reduced scrap charges and other process improvements.

Cost of Services Revenues. The decrease in costs of services revenue resulted from the decrease in costs incurred related to a significant government contract awarded in January 2010 where a substantial portion of the research and development work had been completed during 2010. This decrease in costs is offset by costs incurred related to new contracts in addition to the mix of government and non-government contracts and the timing of development milestones for the year ended December 31, 2011 as compared to the year ended December 31, 2010.

Product Gross Profit (Loss). We experienced a product gross loss during the year ended December 31, 2011, primarily due to low factory utilization and a change in the mix of products sold included a higher ratio of prismatic cells. Currently, our prismatic cell products have higher per-unit costs, as we were in the process of qualification and production ramp-up at our Livonia and Romulus, Michigan facilities, as discussed above, and correspondingly, have lower gross margins as compared to cylindrical cell products which are a more mature product line.

Our future gross profit will be affected by numerous factors, including the build-out of our manufacturing capacity, the timing of the production of new product designs and our ability to reduce cell costs. While we complete the expansion of our manufacturing capacity and ramp-up production volume of prismatic cells, our gross loss will be negatively affected by higher per-unit costs. When we increase our production volumes we anticipate lower per-unit costs due to lower material costs, improved absorption of our manufacturing overhead costs, and improved efficiencies that will all drive down the per-unit cell costs, and positively impact our gross profit. Unabsorbed manufacturing expenses were $45.0 million during the year ended December 31, 2011 as compared to $20.6 million for the year ended December 31, 2010 due to increased capacity brought online in Michigan in late 2010. Due to unabsorbed manufacturing costs and the timing of project-based revenues and costs, we anticipate our gross profit or loss will vary significantly from period-to period going forward.

Services Gross Profit. Services gross profit remained consistent during the year ended December 31, 2011 compared to the year ended December 31, 2010.

Research, Development and Engineering Expenses. A portion of research, development and engineering expenses was offset by cost-sharing funding. Our research, development and engineering expenditures are summarized as follows:

The increase in research, development and engineering expenses for the year ended December 31, 2011 compared to the year ended December 31, 2010 was primarily attributable to an increase of $12.5 million in personnel-related expenses associated with an increase in research, development and engineering personnel who primarily focus on process improvement, material science chemistry and battery and battery systems technology. In addition the increase is also attributable to $3.9 million related to the depreciation of machinery and equipment used for research, development and engineering and an increase of $1.2 million in other research, development and engineering costs. This increase was partially offset by an increase in research, development and engineering reimbursements of $1.4 million from funding received under cost-sharing contracts. Research, development and engineering expense was 62% of revenue for the year ended December 31, 2010, compared to 48% for the year ended December 31, 2011.

Sales and Marketing Expenses. The increase in sales and marketing expenses for the year ended December 31, 2011 compared to the year ended December 31, 2010 was primarily attributable to an increase in personnel-related expenses associated with an increase in sales and marketing headcount. Sales and marketing expense was 15% of revenue for the year ended December 31, 2010, compared to 11% for the year ended December 31, 2011.

General and Administrative Expenses. The increase in general and administrative expenses for the year ended December 31, 2011 compared to the year ended December 31, 2010 was primarily due to an increase in personnel-related expenses of $3.6 million, associated with an increase in general and administrative headcount, an increase in legal expenses of $4.1 million primarily related to the settlement charge on the HydroQuebec lawsuit and an increase in other general and administrative expenses of $1.4 million. General and administrative expense was 37% of revenue for the year ended December 31, 2010, compared to 28% for the year ended December 31, 2011.

Production Start-up Expenses. A portion of production start-up expenses was offset primarily by government grant funding. Our production start-up expenditures are summarized as follows:

The decrease in production start-up expenses for the year ended December 31, 2011 compared to the year ended December 31, 2010 is primarily due to decreased production start-up expenses related to our manufacturing expansion at our Livonia, Michigan facility as the first production line was qualified for production in December 2010. The qualification of our first production line involved the use of more materials and labor compared to the subsequent production lines as we are able to better anticipate the outcomes of the qualification process. Further, the Romulus, Michigan facility, which was qualified during the year ended December 31, 2011, involved the use of more machinery and equipment, therefore requiring less labor expenses. This decrease was partially offset by a reduction in reimbursement from government grant funding totaling $1.0 million. Production start-up expenses were 22% of revenue for the year ended December 31, 2010, compared to 6% for the year ended December 31, 2011.

The change in interest expense for the year ended December 31, 2011 was due to an increase in total debt and capital lease balances outstanding during the year ended December 31, 2011. The increase in net foreign exchange gains for the year ended December 31, 2011 is due to the effect of currency exchange rate changes on transactions that are not U.S Dollar denominated and charged or credited to earnings.

During the year ended December 31, 2011, we elected not to participate in Fisker's subsequent stock financing. Our investment in Fisker is accounted for under the cost method. This election not to participate resulted in the conversion of our preferred shares of Fisker to common shares on a 2:1 ratio. As such, we performed an analysis and valuation of our investment in Fisker resulting to the recognition of an impairment charge of $11.6 million for the year ended December 31, 2011.The increase in other income is primarily due to the gain recognized on the deconsolidation of our joint venture which was previously consolidated as a variable interest entity.

Provision for Income Taxes. The provision for income taxes for the years ended December 31, 2010 and 2011 was primarily related to foreign and state income taxes. We did not report a benefit for federal income taxes in the consolidated financial statements as the deferred tax asset generated from our net operating loss has been offset by a full valuation allowance because it is more likely than not that the tax benefits of the net operating loss carry forward may not be realized.

Product Revenue. The decrease in sales in the transportation industry of $1.6 million for the year ended December 31, 2010 compared to the year ended December 31, 2009 was primarily due to a decrease in sales to Mercedes-Benz HighPerformanceEngines of $6.0 million. This decrease was partially offset by an increase of $4.4 million in sales to other transportation customers. The decrease in sales in the commercial industry of $3.5 million for the year ended December 31, 2010 compared to the year ended December 31, 2009 was primarily due to a decrease in sales to a commercial customer and its affiliates of $9.1 million, partially offset by an increase in sales to other customers in the commercial industry of $5.6 million. Sales to customers in the electric grid industry increased by $2.5 million due to increased shipments of electric grid storage systems.

Services Revenue. The increase in services revenue was related to the increase in revenue from government agency research contracts, which was primarily due to a new project award granted.

Cost of Product Revenue. The increase in cost of product revenue was primarily due to an unfavorable change in the mix of products sold in the year ended December 31, 2010 which included a higher ratio of prismatic cell products to cylindrical cell products, as compared to the year ended December 31, 2009. In addition, due to low factory utilization, unabsorbed manufacturing expenses were $21.7 million for the year ended December 31, 2009, compared to $20.6 million for the year ended December 31, 2010.

Cost of Services Revenues. The increase in costs of services revenue resulted from the increase in services revenues in addition to the mix of government and non-government contracts for the year ended December 31, 2010 as compared to the year ended December 31, 2009.

Product Gross Profit (Loss). We experienced a product gross loss during the year ended December 31, 2010, primarily due to low factory utilization. Our future gross profit will be affected by numerous factors, including the build-out of our manufacturing capacity, the timing of the production of new product designs, and our ability to reduce cell costs. For example, unabsorbed manufacturing expenses were $20.6 million during the year ended December 31, 2010. As a result, our gross profit or loss will vary significantly from period-to period going forward. In addition, gross profit decreased due to an unfavorable change in the mix of products sold in the year ended December 31, 2010 as the year ended December 31, 2010 included a higher ratio of prismatic cell products to cylindrical cell products, as compared to the year ended December 31, 2009.

Services Profit. Services gross profit decreased due to the mix of government and non-government contracts in the year ended December 31, 2010, as the year ended December 31, 2009 included a greater percentage of higher margin contracts.

Research and Development Expenses. A portion of research and development expenses was offset by cost-sharing funding. Our research and development expenditures are summarized as follows:

The increase in research, development and engineering expenses for the year ended December 31, 2010 compared to the year ended December 31, 2009 was primarily attributable to an increase of $13.5 million in personnel-related expenses associated with an increase in research, development and engineering personnel who primarily focus on process improvement, material science chemistry and battery and battery systems technology and an increase of $1.1 million in other research, development and engineering costs. This increase was partially offset by an increase in research, development and engineering reimbursements of $2.2 million. Research, development and engineering expense was 53% of revenue for the year ended December 31, 2009, compared to 62% for the year ended December 31, 2010.

Sales and Marketing Expenses. The increase in sales and marketing expenses for the year ended December 31, 2010 compared to the year ended December 31, 2009 was primarily attributable to an increase of $4.2 million in personnel-related expenses associated with an increase in sales and marketing headcount, in addition to an increase in marketing expenses related to trade shows, public relations, advertising, and other sales and marketing related expenses of $1.5 million. Sales and marketing expense was 9% of revenue for the year ended December 31, 2009, compared to 15% for the year ended December 31, 2010.

General and Administrative Expenses. The increase in general and administrative expenses for the year ended December 31, 2010 compared to the year ended December 31, 2009 was primarily due to an increase in personnel-related expenses of $5.8 million, associated with an increase in general and administrative headcount, an increase in legal expenses of $1.7 million and an increase in other general and administrative expenses of $4.1 million. General and administrative expense was 27% of revenue for the year ended December 31, 2009, compared to 37% for the year ended December 31, 2010.

Production Start-up Expenses. A portion of production start-up expenses was offset primarily by government grant funding. Our production start-up expenditures are summarized as follows:

The increase in production start-up expenses for the year ended December 31, 2010 compared to the year ended December 31, 2009 was primarily due to increased production start-up expenses related to our manufacturing expansion at our Livonia and Romulus, Michigan facilities. In addition, during the year ended December 31, 2010, we incurred $12.7 million of production start-up expenses related to materials, labor and overhead costs incurred in the qualification of the prismatic cell production line. This increase was partially offset by cost offsets from government grant funding totaling $5.6 million. There was no offset to production start-up expenses during the year ended December 31, 2009.

The change in interest expense for the year ended December 31, 2010 was due to an increase in total debt and capital lease balances outstanding. The decrease in net foreign exchange gains for the year ended December 31, 2010 is due to the effect of currency exchange rate changes, in particular changes in the U.S. Dollar—Korean Won exchange rate. The decrease in unrealized loss on preferred stock warrant liability was due to the conversion of the preferred stock warrants to common stock warrants in connection with our IPO. Other income is due to losses recognized on our Chinese joint venture and our investment in 24M Technologies, Inc., or 24M, a privately-held company, both accounted for under the equity method. These losses are partially offset by a gain on long-term investment due to the excess of the fair value of the ownership 24M, over the carrying value of the patents transferred to 24M.

Provision for Income Taxes. The provision for income taxes for the years ended December 31, 2009 and 2010 was primarily related to foreign and state income taxes. We did not report a benefit for federal income taxes in the consolidated financial statements as the deferred tax asset generated from our net operating loss has been offset by a full valuation allowance because it is more likely than not that the tax benefits of the net operating loss carry forward may not be realized.

Since inception, we have funded our operations primarily through the sale and issuance of preferred stock, common stock, convertible debt, warrants, demand notes and term loans, and credit facilities. In April 2011, we received net proceeds, after deducting issuance costs, of $138.8 million and $115.2 million from the issuance of our 3.75% convertible subordinated notes and the issuance of common stock, respectively, in our concurrent public offerings. In September 2011, we secured $38.1 million from a revolving line of credit with Silicon Valley Bank, and in November 2011, we received $25.0 million through the sale and issuance of shares of our common stock to IHI Corporation and a $7.5 million upfront fee in connection with our technology license agreement. Additionally, we received government grants of $33.7 million as reimbursement of capital expenditures. As of December 31, 2011, we had cash and cash equivalents of $186.9 million, accounts receivable of $47.2 million and purchase obligations of $48.4 million due within the year. And most recently, in January 2012, we completed a registered direct offering of 12,500,000 units at a negotiated price of $2.034 per unit, with each unit consisting of (i) one share of our common stock and (ii) one warrant to purchase a share of our common stock for net proceeds of approximately $23.5 million.

To fund our growth over the next 12 months, including anticipated future losses, purchase commitments, and capital expenditures, we are taking actions to reduce the cash used in operating and investing activities including plans to improve our gross margins, reduce our operating expenses, and increase inventory turns. However, we may also attempt to raise additional capital to fund cash requirements through expansion of the existing line of credit and/or additional strategic partnerships. As part of our ongoing strategic efforts, we regularly take part in discussions with other potential strategic partners that could provide additional capital as well as improved access to different markets in which to sell our products. Although our intent is to improve our operating efficiencies and to obtain additional financing through new partnerships, there is no guarantee that we will be able to achieve such expected improvements in operating performance or that we will obtain such external funding. As a result of all these actions, we will have sufficient cash for the next 12 months.

Our capital expenditures were $39.4 million in 2009, $177.2 million for 2010 and $123.3 million for 2011. In 2012, we expect our capital expenditures, excluding any reimbursement under government grants, to be approximately $30.0 million.

The following table sets forth the major sources and uses of cash for each of the periods set forth below (in thousands):

Operating activities used $251.6 million of net cash during the year ended December 31, 2011. Including the portion related to the non-controlling interest, we incurred a net loss of $257.8 million in 2011, which included impairment of long-term investment of $11.6 million, non-cash share-based compensation expense of $14.1 million and depreciation and amortization of $25.2 million. Increased investment in working capital and non-current operating assets and liabililties used $51.1 million of net cash during the year ended December 31, 2011.

Operating activities used $127.8 million of net cash during the year ended December 31, 2010. We incurred a net loss of $152.9 million in 2010, which included non-cash share-based compensation expense of $11.8 million and depreciation and amortization of $17.0 million. Increased investment in working capital and non-current operating assets and liabilities used $6.3 million of net cash during the year ended December 31, 2010.

Operating activities used $73.6 million of net cash during the year ended December 31, 2009. We incurred a net loss of $86.6 million in 2009, which included non-cash share-based compensation expense of $8.6 million and depreciation and amortization of $13.2 million. Increased investment in working capital and non-current operating assets and liabilities used $9.9 million of net cash during the year ended December 31, 2009.

We anticipate negative cash flow from operations in the near future as we continue to support the anticipated growth of our business.

Cash flows from investing activities primarily relate to capital expenditures to support our growth.

Cash used in investing activities totaled $82.2 million during the year ended December 31, 2011 and consisted of capital expenditures of $123.3 million, primarily related to the purchase of manufacturing equipment, offset in part by proceeds from government grants of $33.7 million, cash paid for investments of $3.3 million and a decrease in restricted cash used of $10.7 million.

Cash used in investing activities totaled $122.5 million during the year ended December 31, 2010 and consisted of capital expenditures of $177.2 million, primarily related to the purchase of manufacturing equipment, offset in part by proceeds from government grants of $78.2 million, cash paid for investments of $14.9 million and an increase in restricted cash used of $8.6 million.

Cash used in investing activities totaled $41.2 million during the year ended December 31, 2009 and consisted of capital expenditures of $39.4 million primarily related to the purchase of manufacturing equipment and an increase in restricted cash used of $1.8 million.

We anticipate additional capital expenditures in future periods as we continue to fund the expansion of our facilities to support the continued growth of our business. As of December 31, 2011, we have contractual obligations, which include agreements or purchase orders to purchase goods, related to capital expenditure purchases of $10.7 million. Additionally, in future periods, we anticipate investing cash in joint ventures and other equity investments in order to establish strategic relationships.

Cash flows from financing activities totaled $303.9 million during the year ended December 31, 2011 and included proceeds from issuance of long-term debt of $138.8 million, proceeds from issuance of common stock of $140.2 million, proceeds from revolving line of credit of $37.8 million, proceeds from government grants of $0.9 million, proceeds from exercise of stock options of $2.0 million, and contribution from noncontrolling interests of $0.6 million. These proceeds were partially offset by repayments on our revolving credit line of $8.0 million and repayment on long-term debt of $5.4 million, and repayments on capital lease obligations of $3.0 million. In future periods, we expect

financing activities such as proceeds from grants, equity offerings and debt issuances to be a significant source of cash.

Cash flows from financing activities totaled $9.9 million during the year ended December 31, 2010 and included proceeds from government grants of $9.8 million, proceeds from exercise of stock options of $4.3 million, proceeds from issuance of long-term debt of $2.5 million and contribution from noncontrolling interests of $0.5 million. These proceeds were partially offset by repayments on long-term debt of $6.5 million, and repayments on capital lease obligations of $0.7 million. In future periods, we expect financing activities such as proceeds from grants, equity offerings and debt issuances to be a significant source of cash.

Cash flows from financing activities totaled $501.4 million during the year ended December 31, 2009 and included net proceeds from the initial public issuance of common stock of $395.8 million, proceeds of $99.6 million from the issuance of series F redeemable convertible preferred stock, proceeds from government grants of $3.9 million, proceeds from issuance of long-term debt of $8.6 million and proceeds from exercise of stock options of $0.4 million. These proceeds were partially offset by repayments on long-term debt of $6.2 million, and repayments on capital lease obligations of $0.7 million.

On September 30, 2011, we entered into a Revolving Credit Agreement (the "Agreement"), providing us a revolving loan facility in an aggregate principal amount of up to the lesser of (i) $40.0 million or (ii) a Borrowing Base (as defined in the Agreement) established at 80% of certain eligible accounts, 15% of certain eligible foreign accounts and 30% of certain eligible inventory, as more specifically described in the Agreement. The Agreement also provides a letter of credit sub-facility in an aggregate principal amount of up to $10.0 million and a swing-line loan sub-facility in an aggregate principal amount of up to $5.0 million. Any outstanding obligations under either the letter of credit sub-facility or swing-line sub-facility deduct from the availability under the $40.0 million revolving facility. The Agreement additionally provides a discretionary incremental facility in an aggregate principal amount of not less than $10.0 million and up to $35.0 million. The funding of the incremental facility is discretionary on the part of the lenders and will depend on market conditions and other factors. The Agreement permits us to enter into cash management and hedging agreements with the lenders.

The facilities provided under the Agreement were used to refinance the our prior outstanding revolving loan facility with the financial institution, dated as of August 2, 2006, and are to be used for working capital and general corporate purposes. The maturity date for any revolving cash borrowings under the Agreement is September 30, 2014.

Revolving cash borrowings under the Agreement will bear interest at (i) the Eurodollar Rate (as defined in the Agreement), plus 2.25% (if our liquidity is greater than $75.0 million) or 2.75% (if our liquidity is equal to or less than $75.0 million) per annum, and/or (ii) the base rate (customarily defined), plus 0.50% (if our liquidity is equal to or less than $75.0 million) per annum. The interest rate at December 31, 2011 is 2.62%.

Amounts outstanding under the Agreement (including any cash management or hedging agreements as provided in the Agreement) are secured by substantially all of our existing and future assets, except intellectual property and certain other exceptions as set forth in the Agreement and related security documents.

Additionally, we may not create, issue, incur, assume or be liable in respect of or suffer to exist, any indebtedness, except for permitted indebtedness or create, incur, assume or suffer to exist, any lien on its property, except for permitted liens. Under the credit agreement, an event of default would occur if we fail to pay any obligation due or fail or neglect to perform, keep or observe any material term provision, condition, covenant or agreement within the credit agreement, and do not, or are not able to remedy the default within the allowed grace period, or a material adverse change in our business occurs. Upon an event of default, the financial institution may declare all obligations immediately due and payable, it may stop advancing money or extending credit or it may apply against the obligation balances and deposits which we hold with the financial institution, among other remedies available to the financial institution under the terms of the credit agreement. As of December 31, 2011, we were in compliance with all covenants under this facility.

On March 6, 2012, we entered into the First Amendment to our Revolving Credit Agreement that was previously established on September 30, 2011. The amendment extends the Revolving Termination Date of the agreement to June 1, 2013.

The amendment increases all applicable interest rates by 0.50%, such that the revolving cash borrowings under the Agreement now bear interest at (i) the Eurodollar Rate (as defined in the Agreement), plus 2.75% (if our liquidity is greater than $75.0 million) or 3.25% (if our liquidity is equal to or less than $75.0 million) per annum, and/or (ii) the base rate (customarily defined), plus 0.50% (if our liquidity is greater than $75.0 million) or 1.00% (if our liquidity is equal to or less than $75.0 million) per annum.

The eligible inventory component of the Borrowing Base (as defined in the Agreement) formula remains capped at 30% of the entire Borrowing Base, but the previous limitation on this eligible inventory component increased from 20% of all outstanding revolving extensions of credit to the lesser of $8.0 million or 50% of all outstanding revolving extensions of credit. Also, the required Consolidated Tangible Net Worth (as defined in the Agreement) that we must maintain decreased from $400.0 million to $300.0 million.

Our contractual obligations relate primarily to borrowings under long-term debt obligations, capital leases, operating leases, and purchase obligations which include agreements or purchase orders to purchase goods or services that are enforceable and legally binding.

The following is a summary of our contractual obligations as of December 31, 2011:

In addition, as discussed in Note 12 to our consolidated financial statements, we have approximately $1.3 million associated with uncertain tax positions and related interest and penalties. These liabilities are included as a component of "other long-term liabilities" in our consolidated balance sheet, as we do not anticipate that settlement of the liabilities will require payment of cash within the next twelve months. We are not able to reasonably estimate when we would make any cash payments required to settle these liabilities, but do not believe that the ultimate settlement of our obligations will materially affect our liquidity. Additionally, we have a line of credit with an outstanding balance of $38.1 million as of December 31, 2011.

In June 2010, we entered into a supply agreement under which we committed to minimum purchase volumes for each of the years ending December 31, 2010 through December 31, 2013 for a raw material component. If our purchase volumes during any year fail to meet the minimum purchase commitments, we are required to pay the seller a variance payment for the difference between the amount actually purchased in that calendar year and the annual minimum purchase commitment for that calendar year. We will receive a credit for the amount of the variance payment to be applied to purchases in the following year and we will have until April 1, 2015 to reclaim any variance payment resulting from the minimum purchase commitments for calendar years 2012 or 2013. The table shown above in the section titled "Purchase Obligations" shows the amount of our purchase commitments payable by year inclusive of our commitment under the supply agreement described above. For the year ended December 31, 2011, we have purchased $8.5 million under this supply agreement. As the supplier of raw materials was not able to meet capacity requirements, we were relieved of our obligation to meet the minimum purchase commitment for the year ended December 31, 2011.

During the periods presented, we did not have and do not currently have, any off-balance sheet arrangements, as defined under SEC rules, such as relationships with unconsolidated entities or financial partnerships, which are often referred to as structured finance or special purpose entities, established for the purpose of facilitating financing transactions that are not required to be reflected on our balance sheet, other than the arrangement described above.

Foreign Currency Exchange Risk. As a result of our foreign operations, we have significant expenses, assets and liabilities that are denominated in foreign currencies. A significant number of our employees are located in Asia. Therefore, a substantial portion of our payroll as well as certain other operating expenses are paid in the China RMB and South Korean Won. Additionally, we purchase materials and components from suppliers in Asia. While we pay these suppliers in U.S. dollars, their costs are typically based upon the local currency of the country in which they operate. All of our revenues are received in U.S. dollars because our customer contracts generally provide that our customers will pay us in U.S. dollars.

As a consequence, our gross profit, operating results, profitability and cash flows are adversely impacted when the dollar depreciates relative to other foreign currencies. We have a particularly significant currency rate exposure to changes in the exchange rate between the China Renminbi (RMB) and South Korean Won to the U.S. dollar. For example, to the extent that we need to convert U.S. dollars for our operations, appreciation of the RMB or South Korean Won against the U.S. dollar would have an adverse effect on the amount we receive from the conversion.

We have not used any forward contracts or currency borrowings to hedge our exposure to foreign currency exchange risk.

Interest Rate Sensitivity. We had cash and cash equivalents totaling $186.9 million as of December 31, 2011, and $216.8 million as of December 31, 2010. Our exposure to interest rate risk primarily relates to the interest income generated by excess cash invested in highly liquid investments with maturities of three months or less from the original dates of purchase. The cash and cash equivalents are held for working capital purposes. We have not used derivative financial instruments in our investment portfolio. We have not been exposed, nor do we anticipate being exposed, to material risks due to changes in market interest rates.

Interest rate risk also refers to our exposure to movements in interest rates associated with our revolving line of credit and term loan with Silicon Valley Bank. The interest bearing liabilities are denominated in U.S. dollars and the interest expense is based on the prime interest rate or London Interbank Offered Rate (LIBOR) plus an additional margin, depending on the respective credit facilities. If the prime rate or LIBOR had increased by 100 basis points during the years ended December 31, 2010 and 2011, our interest expense would have increased by approximately $0.2 million assuming consistent borrowing levels.

To the Board of Directors and Stockholders of
A123 Systems, Inc.
Waltham, Massachusetts

We have audited the accompanying consolidated balance sheets of A123 Systems, Inc. and subsidiaries (the "Company") as of December 31, 2010 and 2011, and the related consolidated statements of operations, stockholders' (deficit) equity, and cash flows for each of the three years in the period ended December 31, 2011. These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on these financial statements 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 accessing 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, such consolidated financial statements present fairly, in all material respects, the financial position of A123 Systems, Inc. and subsidiaries as of December 31, 2010 and 2011, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2011, in conformity with accounting principles generally accepted in the United States of America.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the Company's internal control over financial reporting as of December 31, 2011, based on the criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated March 12, 2012 expressed an adverse opinion on the Company's internal control over financial reporting because of a material weakness.

A123 Systems, Inc.

Consolidated Balance Sheets

(in thousands, except share and per share data)

	December 31, 2010			December 31, 2011

ASSETS
Current assets:
Cash and cash equivalents	$	216,841		$	186,893
Restricted cash and cash equivalents		9,367			668
Accounts receivable, net		28,106			47,200
Inventory		47,765			103,394
Deferred cost		1,022			6,256
Prepaid expenses and other current assets		8,006			8,011

Total current assets		311,107			352,422
Property, plant and equipment, net		143,998			145,203
Goodwill		9,581			9,581
Intangible assets, net		413			—
Long-term grants receivable		75,790			101,054
Deposits and other assets		11,768			5,745
Restricted cash and cash equivalents, net of current portion		1,993			—
Investments		21,508			11,897

Total assets	$	576,158		$	625,902

LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Revolving credit lines	$	8,000		$	38,094
Current portion of long-term debt		5,379			2,069
Current portion of capital lease obligations		1,571			1,740
Accounts payable		43,523			27,220
Accrued expenses		48,179			31,910
Other current liabilities		7,550			8,329
Deferred revenue		4,881			9,577
Deferred rent		132			181

Total current liabilities		119,215			119,120
Long-term debt, net of current portion		4,603			142,755
Capital lease obligations, net of current portion		18,655			17,336
Deferred revenue, net of current portion		29,836			35,303
Deferred rent, net of current portion		1,452			1,203
Other long-term liabilities		3,865			13,820

Total liabilities		177,626			329,537
Commitments and contingencies (Note 10)
Stockholders' equity:
Preferred stock, $0.001 par value—5,000,000 shares authorized; 0 shares issued and outstanding at December 31, 2010 and December 31, 2011		—			—
Common stock, $0.001 par value—250,000,000 shares authorized; 105,194,073 and 134,342,974 shares issued and outstanding at December 31, 2010 and December 31, 2011, respectively		105			134
Additional paid-in capital		790,256			946,506
Accumulated deficit		(391,228	)		(648,958	)
Accumulated other comprehensive loss		(935	)		(1,317	)

Total A123 Systems, Inc. stockholders' equity		398,198			296,365
Noncontrolling interest		334			—

Total stockholders' equity		398,532			296,365

Total liabilities and stockholders' equity	$	576,158		$	625,902

A123 Systems, Inc.

Consolidated Statements of Operations

(in thousands, except per share data)

	Year Ended December 31,

	2009			2010			2011
Revenue:
Product	$	76,519		$	73,826		$	139,080
Services		14,530			23,486			20,067

Total revenue		91,049			97,312			159,147

Cost of revenue:
Product		83,778			94,277			232,092
Services		9,963			20,474			17,103

Total cost of revenue		93,741			114,751			249,195

Gross loss		(2,692	)		(17,439	)		(90,048	)

Operating expenses:
Research, development and engineering		48,286			60,723			76,925
Sales and marketing		8,455			14,111			16,808
General and administrative		24,480			36,053			45,132
Production start-up		1,524			21,064			9,221

Total operating expenses		82,745			131,951			148,086

Operating loss		(85,437	)		(149,390	)		(238,134	)

Other income (expense):
Interest income		165			135			19
Interest expense		(1,206	)		(1,430	)		(7,357	)
Gain (loss) on foreign exchange		682			(560	)		3
Unrealized loss on preferred stock warrant liability		(515	)		—			—
Impairment of long-term investment								(11,612	)
Other (expense) income, net		—			(849	)		691

Total other expense, net		(874	)		(2,704	)		(18,256	)

Loss from operations, before tax		(86,311	)		(152,094	)		(256,390	)
Provision for income taxes		278			843			1,367

Net loss		(86,589	)		(152,937	)		(257,757	)
Less: net loss attributable to the noncontrolling interest		810			377			27

Net loss attributable to A123 Systems, Inc.		(85,779	)		(152,560	)		(257,730	)
Accretion to preferred stock		(45	)		—			—

Net loss attributable to A123 Systems, Inc. common stockholders	$	(85,824	)	$	(152,560	)	$	(257,730	)

Net loss per share attributable to A123 Systems, Inc.—basic and diluted:	$	(2.55	)	$	(1.46	)	$	(2.12	)

Weighted average number of common shares outstanding—basic and diluted		33,669			104,364			121,583

A123 Systems, Inc.
Consolidated Statements of Stockholders' (Deficit) Equity
(in thousands, except per share data)

	Series B-1 Convertible Preferred Stock, $0.001 Par Value

							Common Stock, $0.001 Par Value
																	Accumulated Other Comprehensive Loss
											Additional Paid-in Capital			Accumulated Deficit						Total Stockholders' Equity			Noncontrolling Interest			Comprehensive Loss
	Shares			Amount			Shares		Amount		Additional Paid-in Capital			Accumulated Deficit						Total Stockholders' Equity			Noncontrolling Interest			Comprehensive Loss
BALANCE—January 1, 2009		1,493		$	1			7,662	$	8	$	19,649		$	(152,889	)	$	(197	)	$	(133,428	)	$	871
Accretion of redeemable convertible preferred stock to redemption value		—			—			—		—		(45	)		—			—			(45	)		—
Stock-based compensation		—			—			—		—		8,553			—			—			8,553			—
Exercise of stock options		—			—			141		—		369			—			—			369			—
Common stock issued in public offering, net of issuance costs		—			—			109		—		—			—			—			—			—
Exercise of common stock warrant		—			—			31,727		32		391,742			—			—			391,774			—
Conversion of redeemable common stock and convertible preferred stock to common stock and conversion of preferred stock warrant to common stock warrant		(1,493	)		(1	)		62,967		63		347,426			—			—			347,488			—
Comprehensive loss:
Net loss		—			—			—		—		—			(85,779	)		—			(85,779	)		(810	)	$	(86,589	)
Foreign currency translation adjustment		—			—			—		—		—			—			(712	)		(712	)		49			(663	)

Total comprehensive loss		—			—			—		—		—			—			—			—			—		$	(87,252	)

BALANCE—December 31, 2009		—		$	—			102,606	$	103	$	767,694		$	(238,668	)	$	(909	)	$	528,220		$	110
Stock-based compensation		—			—			—		—		11,762			—			—			11,762			—
Exercise of Stock options								2,156		2		4,299			—			—			4,301			—
Issuance of common stock		—			—			432		—		6,501			—			—			6,501			—
Purchase of subsidiary shares by noncontrolling interest holder								—		—		—			—			—			—			532
Comprehensive loss:
Net loss		—			—			—		—		—			(152,560	)		—			(152,560	)		(377	)	$	(152,937	)
Foreign currency translation adjustment		—			—			—		—		—			—			(26	)		(26	)		69			43

Total comprehensive loss		—			—			—		—		—			—			—			—			—		$	(152,894	)

BALANCE—December 31, 2010		—		$	—			105,194	$	105	$	790,256		$	(391,228	)	$	(935	)	$	398,198		$	334
Stock-based compensation								—		—		14,085			—			—			14,085			—
Exercise of stock options								658		1		2,006			—			—			2,007			—
Vesting of restricted stock units								70		—		—			—			—			—			—
Issuance of common stock								28,421		28		140,159			—			—			140,187			—
Deconsolidation of subsidiary								—		—		—			—			—			—			(307	)
Comprehensive loss:																								—
Net loss								—		—		—			(257,730	)		—			(257,730	)		(27	)	$	(257,757	)
Foreign currency translation adjustment								—		—		—			—			(382	)		(382	)		—			(382	)

Total comprehensive loss								—		—		—			—			—			—			—		$	(258,139	)

BALANCE—December 31, 2011		—		$	—			134,343	$	134	$	946,506		$	(648,958	)	$	(1,317	)	$	296,365		$	—

	Year Ended December 31,

	2009			2010			2011
Cash flows from operating activities:
Net loss attributable to A123 Systems, Inc. and non-controlling interest	$	(86,589	)	$	(152,937	)	$	(257,757	)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization		13,230			17,036			25,195
Noncash rent		506			896			(200	)
Noncash foreign exchange gain on intercompany loan		(883	)		(424	)		—
Noncash loss on equity investments		—			849			791
Impairment of long-lived and intangible assets		931			758			4,354
Impairment of long-term investment								11,612
Unrealized loss on preferred stock warrant liability		515			—			—
Gain on asset transfer and subsequent deconsolidation of variable interest entity (VIE)		—			—			(1,255	)
Loss on disposal of property and equipment		49			250			42
Amortization of debt issuance costs and noncash interest expense		65			306			2,629
Stock-based compensation		8,553			11,762			14,085
Changes in current assets and liabilities, excluding the effect of deconsolidation of VIE:
Accounts receivable		17			(9,401	)		(19,844	)
Inventory		(1,646	)		(10,556	)		(55,948	)
Deferred cost					(664	)		(5,234	)
Prepaid expenses and other assets		1,975			(2,598	)		(2,132	)
Accounts payable		(4,339	)		9,199			2,020
Accrued expenses		(474	)		2,568			10,361
Deferred revenue		(5,487	)		55			10,956
Other liabilities		18			5,066			8,735

Net cash used in operating activities		(73,559	)		(127,835	)		(251,590	)

Cash flows from investing activities:
Decrease (increase) in restricted cash		(1,762	)		(8,635	)		10,692
Purchases of and deposits on property, plant and equipment		(39,430	)		(177,233	)		(123,278	)
Proceeds from sale of property and equipment		19			—			—
Proceeds from government grant		—			78,187			33,665
Purchase of investments		—			(14,862	)		(3,287	)

Net cash used in investing activities		(41,173	)		(122,543	)		(82,208	)

Cash flows from financing activities:
Proceeds from issuance of common stock, net of offering costs		395,812			—			140,187
Proceeds from government grant		3,900			9,750			900
Proceeds from exercise of stock options		369			4,301			2,007
Proceeds from revolving credit lines, net of issuance costs		—			—			37,753
Proceeds from issuance of debt, net of offering costs		8,584			2,500			138,824
Principal payments on revolving credit line		—			—			(8,000	)
Principal payments on long term debt		(6,166	)		(6,484	)		(5,379	)
Payments on capital lease obligations		(653	)		(706	)		(3,027	)
Contributions from noncontrolling interest		—			532			600
Net proceeds from issuance of redeemable convertible preferred stock		99,590			—			—

Net cash provided by financing activities		501,436			9,893			303,865

Effect of foreign exchange rates on cash and cash equivalents		(92	)		204			(15	)

Net increase (decrease) in cash and cash equivalents		386,612			(240,281	)		(29,948	)
Cash and cash equivalents at beginning of period		70,510			457,122			216,841

Cash and cash equivalents at end of period	$	457,122		$	216,841		$	186,893

Supplemental cash flow information—cash paid for interest	$	1,189		$	1,033		$	3,696

Noncash investing and financing activities:
Issuance of note for consulting services	$	830		$	—		$	—

Purchase of equipment under capital leases	$	572		$	20,022		$	153

Increase in accounts payable and accrued expenses for property, plant and equipment	$	1,939		$	53,257		$	9,584

Deferred offering costs included in accounts payable and accrued expenses	$	221		$	—		$	—

Issuance of common stock for investment	$	—		$	7,495		$	—

Fulfillment of government grants with advanced proceeds	$	—		$	12,790		$	925

A123 Systems, Inc. (the "Company") was incorporated in Delaware on October 19, 2001 and has its corporate offices in Waltham, Massachusetts. The Company designs, develops, manufactures and sells advanced rechargeable lithium-ion batteries and energy storage systems and provides research and development services to government agencies and commercial customers.

Management Plan Note—The Company's available sources of cash primarily include cash and cash equivalents, proceeds from government grants, and available borrowings under the revolving line of credit. To fund the Company's growth and expansion plans, including anticipated future losses, purchase commitments, capital expenditures, and principal and interest payments on borrowing, the Company will need to raise additional capital in the next twelve months. The Company believes that it will be able to raise the capital necessary to implement its business plan through 2012 and into 2013 through strategic and independent investors. On January 25^th, the Company raised $23.5 million from an institutional investor in a registered direct offering (see footnote 20). In addition, the Company is also taking actions to improve cash flow by reducing manufacturing costs and operating expenses, as well as by managing inventory levels based on improved forecasting of customer demand and manufacturing lead times.

However, if the Company is unable to raise enough capital and improve operating performance, the Company's growth potential may be adversely affected and the Company will have to modify its growth plans to conserve available cash. Management believes that the available cash and cash equivalents should be sufficient to fund operations for the next twelve months.

Principles of Consolidation—The accompanying consolidated financial statements include the accounts of the Company and its subsidiaries. All inter-company balances and transactions have been eliminated in consolidation.

In February 2011, the Company entered into an agreement to transfer certain of its assets held by its wholly owned Korean subsidiary to its joint venture with a quasi governmental entity in the Peoples' Republic of China. For years ended December 31, 2009 and 2010, the joint venture was consolidated as a variable-interest entity, but did not have a material impact on the Company's consolidated financial operations and did not represent a material portion of the Company's total consolidated assets. The asset transfer and subsequent deconsolidation of the joint venture resulted in a $1.2 million gain recognized in other expense, net for the year ended December 31, 2011.

Use of Estimates—The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America ("GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenue, expense and related disclosures. The Company bases estimates and assumptions on historical experience and on various other factors that it believes to be reasonable under the circumstances. The Company evaluates its estimates and assumptions on an ongoing basis. The Company's actual results may differ from these estimates under different assumptions or conditions.

Revisions to Amounts Previously Presented—Certain prior period amounts have been reclassified to conform to the current period presentation. Deferred costs of $1.0 million for the year ended December 31, 2010 relating to costs of product shipments where title has passed to the customer but not all of the revenue recognition criteria have been met, have been reclassified from inventory to

deferred costs in the consolidated balance sheets and consolidated statements of cash flows. Additionally, customer deposits received from customers of $6.2 million for products that have not been shipped, have been reclassified from deferred revenue to other current liabilities in the consolidated balance sheets and consolidated statements of cash flows.

Foreign Currency Translation and Remeasurement—The Company's foreign operations are subject to exchange rate fluctuations and foreign currency transaction costs. Majority of the Company's sales are denominated in U.S. dollars. During the second quarter of 2011, the Company's foreign operations in Korea changed to a U. S. dollar foreign functional currency as a result of the asset transfer and deconsolidation of its joint venture. Prior to the change in the functional currency of our foreign operations in Korea, local currency denominated assets and liabilities are translated at the period-end exchange rates, and sales, costs and expenses are translated at the average exchange rates during the period. Gains or losses resulting from foreign currency translation attributable to the Company are included as a component of accumulated other comprehensive loss in the consolidated balance sheets. For foreign operations with the U.S. dollar as the functional currency, foreign currency denominated assets and liabilities are remeasured at the period-end exchange rates and related gains or losses are reflected as other expense in the consolidated statements of operations. Nonmonetary assets (e.g., inventories, and property, plant, and equipment) and related income statement accounts (e.g., cost of sales and depreciation) are remeasured at historical exchange rates. During the years ended December 31, 2009, 2010 and 2011, the Company recognized net gains (losses) on foreign exchange of $0.7 million, $(0.6) million and $0, respectively.

Cash and Cash Equivalents—Cash equivalents include short-term, highly-liquid instruments, consisting of money market accounts and short-term investments with original maturities of less than 90 days. The majority of cash and cash equivalents are maintained with major financial institutions in North America. Deposits with these financial institutions may exceed the amount of insurance provided on such deposits; however, these deposits may be redeemed upon demand and, therefore, bear minimal risk.

Restricted Cash and Cash Equivalents—Cash and cash equivalent accounts with any type of restriction are classified as restricted cash and cash equivalents. If the restriction is expected to be lifted in more than twelve months or will be used for the purchase of property, plant and equipment, the restricted cash and cash equivalent account is classified as non-current. The Company maintained compensating cash balances for letters of credit as security for facility leases and contracts in the amount of $10.4 million at December 31, 2010. The letters of credit related to contracts were released as of December 31, 2011 due to the achievement of certain milestones while the compensating cash balance requirement for facility leases were released upon entering into a new credit agreement in September 2011.

The Company classifies cash received from government grants as restricted cash when the funding is received in advance of using it for qualified expenditures. As of December 31, 2010 and 2011, $0.8 million and $0.7 million were recorded as restricted cash classified as current.

Government Grants—The Company recognizes government grants when there is reasonable assurance that the Company will comply with the conditions attached to the grant arrangement and the grant will be received. The Company evaluates the conditions of each individual grant as of each reporting period to ensure that the Company has reached reasonable assurance of meeting the

conditions of each grant arrangement and that it is expected that the grant will be received as a result of meeting the necessary conditions. For example, if a grant has conditions where the Company must create and maintain a certain number of jobs, the Company records the grant in the period that it has evaluated and determined that the necessary number of jobs has been created and, based on the Company's forecasts, it is reasonably assured that the jobs will be maintained during the required employment period. Government grants are recognized in the consolidated statements of operations on a systematic basis over the periods in which the Company recognizes the related costs for which the government grant is intended to compensate. Specifically, when government grants are related to reimbursements for cost of revenues or operating expenses, the government grants are recognized as a reduction of the related expense in the consolidated statements of operations over the period that the Company is required to comply with the conditions of the grants. For government grants related to reimbursements of capital expenditures, the government grants are recognized as a reduction of the basis of the asset and recognized in the consolidated statements of operations over the estimated useful life of the depreciable asset as reduced depreciation expense.

The Company records government grant receivables in the consolidated balance sheets in prepaid expenses and other current assets or long-term grant receivable, depending on when the amounts are expected to be received from the government agency. The Company does not discount long-term grant receivables. Proceeds received from government grants prior to expenditures being incurred are recorded as restricted cash and other current liabilities or other long-term liabilities, depending on when the Company expects to use the proceeds.

The Company classifies in the consolidated statements of cash flows grant proceeds received in advance of spending for qualified expenditures as a cash flow from financing activities, as the proceeds are used to assist in funding future expenditures. Grant proceeds received as reimbursements for capital expenditures previously incurred are classified in cash flows from investing activities and grant proceeds received as reimbursements for operating expenditures previously incurred are classified in cash flows from operating activities.

Accounts Receivable and Concentrations of Credit Risks—Accounts receivable are stated net of an allowance for contractual adjustments and uncollectible accounts, which are determined by establishing reserves for specific accounts and consideration of historical and estimated probable losses. The following table sets forth the activity in the allowance for each of the periods set forth below (in thousands):

The unbilled portion of accounts receivable from certain government research and development contracts included in the accounts receivable balance was $0.8 million and $0 at December 31, 2010 and 2011, respectively. The unbilled portion of the accounts receivable are periodically invoiced based on the terms of the government research and development contract.

The Company had one customer at December 31, 2010 who accounted for 32% of total accounts receivable and one customer, who, together with its affiliates, accounted for 36% of total accounts receivable at December 31, 2011.

During the year ended December 31, 2009, one customer of the Company, together with its affiliates, and a second customer represented 14% and 35% of the Company's revenue, respectively. During the year ended December 31, 2010, two customers of the Company represented 28% and 13% of the Company's revenue, respectively. During the year ended December 31, 2011, one customer of the Company, and a second customer, together with its affiliates, represented 26% and 24% of the Company's revenue, respectively.

The U.S. government and its agencies, departments and subcontractors comprised 23%, 51% and 36% of services revenue for the years ended December 31, 2009, 2010, and 2011 , respectively.

Inventory—Inventories are stated at the lower of cost or market. Cost is determined on a first-in, first-out basis and includes material costs, labor and applicable overhead. The Company reviews inventory for excess quantities and obsolescence based on its best estimates of future demand, product lifecycle and product development plans. The Company uses historical information along with future estimates to write-down obsolete and potentially obsolete inventory.

Property, Plant and Equipment—Property, plant and equipment are stated at cost. Assets held under capital leases are stated at the lesser of the present value of future minimum payments, using the Company's incremental borrowing rate at the inception of the lease, or the fair value of the property at the inception of the lease. Expenditures for maintenance and repairs are charged to expense as incurred, whereas major betterments are capitalized as additions to property, plant and equipment. The Company capitalizes interest costs as part of the historical cost of constructing manufacturing facilities. Depreciation and amortization is provided using the straight-line method over the following estimated useful lives:


Asset Classification		Estimated Useful Life
Computer equipment and software		3 years
Furniture and fixtures		5 years
Automobiles		5 years
Machinery and equipment		5-7 years
Buildings		10-20 years
Leasehold improvements		Lesser of useful life or lease term

Goodwill and Indefinite-Lived Intangible Assets—Goodwill is comprised of the cost of business acquisitions in excess of the fair value assigned to the net tangible and identifiable intangible assets acquired. Indefinite-lived intangible assets consist of trademarks and trade names the Company has acquired through business acquisitions. Goodwill and indefinite-lived intangible assets are not amortized but are reviewed for impairment annually and more frequently if events or changes in circumstances indicate that the asset might be impaired. If an impairment exists, a loss is recorded to write-down the value of goodwill or indefinite-lived intangible assets to their implied fair value. As a result of the decline in revenue from the Company's Korean subsidiary the Company evaluated the trade name intangible for impairment which resulted in a $0.3 million asset impairment charge in the year ended

December 31, 2010 which was recorded in sales and marketing expenses in the Company's consolidated statements of operations.

The Company performed the annual impairment test for goodwill and indefinite-lived intangible assets in the fourth quarter 2011. Based on the results of the test, there was no impairment on the carrying value of goodwill and the Company did not record any material impairment charges related to indefinite-lived intangible assets.

Intangible Assets Subject to Amortization—The Company amortizes its intangible assets with definitive lives over their estimated useful lives, which range from less than a year to 17 years, based on the same pattern as the Company expects to receive the economic benefit from these assets.

The Company evaluated its intangible assets related to customer relationships for impairment which resulted in a $0.2 million intangible asset impairment charge for the year ended December 31, 2011. No impairment charge for intangible assets subject to amortization was recorded for the years ended December 31, 2009 or 2010.

Impairment of Long-Lived Assets—The Company's long-lived assets include property, plant and equipment and intangible assets subject to amortization (i.e., patented technology, contractual backlog, specially-trained workforce and customer relationships). The Company evaluates long-lived assets for recoverability whenever events or changes in circumstances indicate that an asset may have been impaired. Such circumstances would include, but are not limited to, material adverse changes in projected revenues and expenses, significant underperformance relative to historical or projected future operating results and significant negative industry or economic trends. In evaluating an asset or asset group for recoverability, the Company estimates the future cash flow expected to result from the use of the asset or asset group and eventual disposition. If the expected future undiscounted cash flow is less than the carrying amount of the asset or asset group, an impairment loss, equal to the excess of the carrying amount over the fair value of the asset or asset group, is recognized. The estimates used to determine whether impairment has occurred are subject to a number of management assumptions. The Company groups long-lived asset or assets with other assets and liabilities at the lowest level for which identifiable cash flows are available. The Company estimates the fair value of an asset or asset group based on market prices (i.e., the amount for which the asset could be bought by or sold to a third party), when available. When market prices are not available, the Company estimates the fair value of the asset group using the income approach, which is subject to a number of management assumptions. The income approach uses cash flow projections. Inherent in the Company's development of cash flow projections are assumptions and estimates derived from a review of the Company's operating results, approved operating budgets, expected growth rates and cost of capital. The Company also makes certain assumptions about future economic conditions, interest rates, and other market data. Many of the factors used in assessing fair value are outside the control of management, and these assumptions and estimates can change in future periods.

Directors. Historically, the Company's primary variances between its projections and actual results have been with regard to assumptions for future production, service sales, and cost of products and services. These factors are based on the Company's best knowledge at the time the Company prepares the budgets but can vary significantly due to changes in supply and demand, changes in raw material prices, and changes in other economic conditions

During the years ended December 31, 2009 and 2010, the Company recorded impairment charges of $0.7 million and $0.4 million, respectively, related to impaired equipment at its China and Korea facilities, which were recorded in product cost of sales in the Company's consolidated statements of operations. During the year ended December 31, 2011, the Company recorded impairment charges related to impaired equipment at its China and Korea facilities of $4.2 million, of which $3.9 million was recorded in product cost of sales and $0.3 million was recorded in research, development and engineering expenses, respectively.

Investments—The Company's investments include investments in non-publicly traded companies which are accounted for using the cost method or the equity method, depending on the level of influence the Company has over the investment. The Company evaluates investments for impairment whenever events or changes in circumstances indicate that the market value may be less than the carrying value, which if determined to be other-than-temporary, could result in an impairment loss. As of December 31, 2010, the Company had a $20.5 million of investment in Fisker Automotive, Inc. ("Fisker") accounted for under the cost method and an investment of $1.0 million accounted under the equity method. During the year ended December 31, 2011, the Company elected not to participate in Fisker's subsequent stock financing. This election not to participate resulted in the conversion of the Company's preferred shares of Fisker to common shares on a 2:1 ratio. As such, the Company performed an analysis and valuation of its investment in Fisker resulting to the recognition of an impairment charge of $11.6 million in other expense in the Company's consolidated statement of operations for the year ended December 31, 2011. As a result, as of December 31, 2011, the carrying value of the Company's investment in Fisker was $8.9 million. The Company also had an investment of $3.0 million accounted for under the equity method as of December 31, 2011. For the years ended December 31, 2010 and 2011, the Company recorded equity method losses of $1.0 million and $0.8 million, respectively, in the consolidated statement of operations.

Segment, Geographic and Significant Customer Information—Operating segments are defined as components of an enterprise about which discrete financial information is available that is evaluated regularly by the chief operating decision maker, or decision making group, in making decisions on how to allocate resources and assess performance. The Company's chief decision maker is the Chief Executive Officer. The Company's chief decision maker reviews consolidated operating results to make decisions about allocating resources and assessing performance for the entire Company. The Company views its operations and manages its business as one operating segment.

Information about the Company's operations in different geographic regions is presented in the tables below (in thousands):

	Year Ended December 31,

	2009		2010		2011
Geographic revenues (based on shipment destination
or services location)
United States	$	48,876	$	70,856	$	67,014
Finland		—		—		41,264
Chile		8,505		233		15,891
China		8,391		6,875		11,589
Germany		6,023		7,933		5,866
United Kingdom		7,494		1,688		3,912
Korea		669		333		3,069
Japan		479		786		2,588
Austria		1,351		1,250		2,385
Czech Republic		3,086		1,633		—
Mexico		4,185		1,024		—
Malaysia		75		204		—
Other		1,915		4,497		5,569

	$	91,049	$	97,312	$	159,147

The Company groups its revenues into four revenue categories. Revenue for these categories is as follows (in thousands):

Revenue Recognition—The Company earns revenue from the sale of products and delivery of services, including products and services sold under governmental contracts. Revenue is recognized when all of the following criteria are met: persuasive evidence of an arrangement exists, delivery has occurred or services have been provided, the price to the buyer is fixed or determinable, and collectability is reasonably assured. When collectability is not reasonably assured, the Company will record a receivable and defer the revenue and costs associated with the delivered product or services until cash is received from the customer.

If a sales arrangement contains multiple elements, the Company evaluates the agreement to determine if separate units of accounting exist within the arrangement. If separate units of accounting exist within the arrangement, the Company allocates revenue to each element based on the relative selling price of each of the elements.

The Company's multiple element arrangements typically include prototypes, production units and/or engineering and design services. Generally, provided all other revenue recognition criteria have been met, the Company recognizes revenue from prototype and production units upon shipment to the customer and revenue from engineering and design services upon the completion of milestones based on the proportional performance method. In circumstances where the Company does not have the ability to reasonably estimate either the contract costs and/or progress toward completion of the contract, revenue is recognized upon the completion of the contract. The Company's customers may generally cancel orders at any time prior to product shipment.

Each deliverable within a multiple-element revenue arrangement is accounted for as a separate unit of accounting if both of the following criteria are met: (1) the delivered item or items have value to the customer on a standalone basis, and (2) for an arrangement that includes a general right of return relative to the delivered item(s), delivery or performance of the undelivered item(s) is considered probable and substantially in the Company's control. The Company considers a deliverable to have standalone value if the Company sells this item separately, if the item is sold by another vendor, or if the item could be resold by the customer. Further, the Company's revenue arrangements generally do not include a general right of return relative to delivered products. Deliverables that do not meet the criteria for being a separate unit of accounting are combined with a deliverable that does meet that criterion. The appropriate allocation of arrangement consideration and recognition of revenue is then determined for the combined unit of accounting.

The Company allocates arrangement consideration to each deliverable in an arrangement based on its relative selling price. The Company determines selling price using vendor-specific objective evidence ("VSOE"), if it exists; otherwise, the Company uses third-party evidence ("TPE"). If neither VSOE nor TPE of selling price exists for a unit of accounting, the Company uses estimated selling price ("ESP").

VSOE is generally limited to the price charged when the same or similar product is sold separately. If a product or service is seldom sold separately, it is unlikely that the Company can determine VSOE for the product or service. In most cases, VSOE of selling price is an average price of recent actual transactions that are priced within a reasonable range. TPE is determined based on the prices charged by the Company's competitors for a similar deliverable when sold separately. It may be difficult for the Company to obtain sufficient information on competitor pricing to substantiate TPE and, therefore, the Company may not always be able to use TPE.

If the Company is unable to establish selling price using VSOE or TPE, and the new or materially modified arrangement was entered into after January 1, 2010, the Company will use ESP in the allocation of arrangement consideration. The objective of ESP is to determine the price at which the Company would transact if the product or service were sold on a standalone basis. The Company's determination of ESP involves a weighting of several factors based on the specific facts and circumstances of the arrangement. Because of the nature of the business and history with providing services and manufacturing products for various applications, the Company performs an initial assessment on the nature of the services that will be provided by estimating the cost to provide those services plus an estimated profit margin. The Company performs the same assessment on new products by estimating the per unit cost to manufacture the product plus an estimated profit margin. The estimated profit margins initially used in the assessment are based on the Company's profit objectives which will be adjusted based on other considerations such as pricing of similar products and services, characteristics of the specific market, ongoing pricing strategy and policies and value of any enhancements in functionality included in the deliverable.

The Company analyzes the selling prices used in the allocation of arrangement consideration at a minimum on an annual basis. Selling prices will be analyzed on a more frequent basis if a significant change in the business necessitates a more timely analysis or if the Company experiences significant variances in selling prices.

Product revenue is generally recognized upon transfer of title and risk of loss, which is typically upon shipment, unless an acceptance period exists. The Company's customary shipping terms are FOB shipping point or free carrier. In instances where customer acceptance of a product is required, revenue is either recognized (i) upon shipment when the Company is able to demonstrate that the customer specific objective criteria have been met or (ii) upon the earlier of customer acceptance or expiration of the acceptance period.

The Company provides warranties for its products and records the estimated costs as a cost of revenue in the period the revenue is recorded. The Company's standard warranty period extends one to five years from the date of delivery, depending on the type of product purchased and its application. The warranties provide that the Company's products will be free from defects in material and workmanship and will, under normal use, conform to the specifications for the product. The standard warranties further provide that the Company will repair the product or provide replacement parts at no charge to the customer. The Company's warranty liability is based on projected product failure rates and estimated costs of fulfilling warranty claims. Projections are based on the Company's actual warranty experience and other known and expected factors. The Company monitors its warranty liability and adjusts the amounts as necessary. When the Company is unable to reasonably determine its obligation for warranty of new products, revenue from the sale of the products is deferred until expiration of the warranty period or until such time as the warranty obligation can be reasonably estimated.

In instances where the Company has deferred revenue due to not meeting all of the revenue recognition criteria but where title has passed to the customer, the Company also defers the associated costs of revenue until such time that it is able to recognize the revenue. Deferred costs of revenue are classified in the consolidated balance sheets as deferred costs under current assets as these are expected to be recognized as cost of revenue in the consolidated statement of operations within one year. As of December 31, 2010 and 2011, the Company had deferred cost of revenue of $1.0 million and $6.3 million, respectively.

Revenue from services is recognized as the services are performed consistent with the performance requirements of the contract using the proportional performance method if the Company is able to reasonably estimate the contract cost and progress toward completion of the contract. Where arrangements include milestones or governmental approval that impact the fees payable to the Company, revenue is limited to those amounts whereby collectability is reasonably assured. The Company recognizes revenue earned under time and materials contracts as services are provided based upon actual costs incurred plus a contractually agreed-upon profit margin. The Company recognizes revenue from fixed-price contracts using the proportional performance method based on the ratio of costs incurred to estimates of total expected project costs if reasonably dependable estimates of the revenues and costs applicable to various stages of a contract can be made. Estimates made are based on historical experience and deliverables identified in the contract and are indicative of the level of benefit provided to the Company's clients. Project costs are based on the direct salary and associated fringe benefits of the employees on the project plus all direct expenses incurred to complete the project including sub-contractual and equipment costs where the Company is the principal in the arrangement. Under the proportional performance method, there are no costs that are deferred and amortized over the contract term. If the Company does not have the ability to reasonably estimate contract costs or progress toward completion of the contract, the Company defers the related revenue and costs and recognizes the revenues and costs based on the completed contract method. When the completed contract method is used, the excess of accumulated costs over related billings, if any, are classified as an asset and the excess of accumulated billings over related costs, if any, are classified as a liability. The Company classifies the portion of the related asset or liability as long-term if such asset or liability is expected to be recognized beyond one year.

Service revenue includes revenue derived from the execution of contracts awarded by the U.S. Federal government, other government agencies and commercial customers. The Company's research and development arrangements with the federal government or other government agencies typically require the Company to provide pure research, in which the Company investigates design techniques on new battery technologies. The Company's arrangements with commercial customers consist of arrangements where the Company is paid to enhance or modify an existing product or to develop a new product to meet a customer's specifications.

Fees to license the use of the Company's proprietary and licensed technologies are recognized only after both the license period has commenced and the technology has been delivered to the customer. Royalty revenue is recognized when it becomes determinable and collectability is reasonably assured;

otherwise the Company recognizes revenue upon receipt of payment. To date, the Company has not recognized any significant license or royalty revenue.

The Company records deferred revenue for product sales and services revenue in several different circumstances. These circumstances include when (i) the Company has delivered products or performed services but other revenue recognition criteria have not been satisfied, (ii) payments have been received in advance of products being delivered or services being performed and (iii) all other revenue recognition criteria have been met, but the Company is not able to reasonably estimate the warranty expense. Deferred revenue includes up-front fees associated with services arrangements. Deferred revenue expected to be recognized as revenue more than one year subsequent to the balance sheet date is classified as long-term deferred revenue. Deferred revenue will vary depending on the timing and amount of cash receipts from customers and can vary significantly depending on specific contractual terms.

On November 17, 2008, the Company entered into an exclusive agreement to license certain of its technology in the field of consumer electronics devices (excluding power tools and certain other consumer products). In connection with the license agreement and modification, the Company has received and recorded as deferred revenue an up-front license, support and additional fees totaling $28.0 million. In addition, the agreement provides that the Company will be paid royalty fees on net sales of licensed products that include its technology. The Company has agreed to the terms of the license agreement that if, during a certain period following execution of the license agreement, the Company enters into an agreement with a third party that materially restricts the licensee's rights under the license agreement or fails to provide the necessary support to enable the licensee to utilize the Company's technology, then the Company may be required to refund the licensee all license and support fees paid to cover the licensee's capital and other expenses paid and/or committed by the licensee in reliance upon its rights under the license agreement. On April 29, 2011, the transfer of technology was completed, which allowed the Company to begin recognizing revenue on the license and support fee over the longer of the patent term or the expected customer relationship, which is 20 years. During the year ended December 31, 2011, the Company recognized $1.0 million of revenue related to the license and support fee. There was no revenue recognized related to the license and support fee for the years ended December 31, 2009 and 2010.

On November 18, 2011, the Company entered into a technology license agreement to exclusively license its advance battery system technology and systems integration know-how to manufacture battery systems and modules for the transportation market in Japan for a one-time non-refundable license fee of $7.5 million. During the license term of ten years, the Company will also receive royalty payments based on a percentage of the licensee's net sales of products that use or embody the licensed technology and know-how. The Company has received and recorded the upfront license fee of $7.5 million in deferred revenue as of December 31, 2011. Revenue on the license fee will be amortized over the license term expected to commence in 2012.

Customer deposits received from customers related to products where title has not passed are recorded in other liabilities. The Company classifies as long-term the portion of customer deposits that

are expected to be recognized beyond one year. Upon transfer of title and when all of the revenue recognition criteria have been met, the Company recognizes the related revenue. If not all of the revenue recognition criteria have been met, but title to the goods has passed to the customer, the Company records the related amount in deferred revenue. As of December 31, 2010 and 2011, the Company recorded customer deposits of $6.2 million and $6.9 million in other current liabilities, respectively.

Shipping and Handling Costs—Shipping and handling costs are classified as a component of cost of revenue. Customer payments of shipping and handling costs are recorded as product revenue.

Research, Development and Engineering Costs—Costs incurred in the research, development and engineering of the Company's products are expensed as incurred and include salaries, third-party contractors, materials, and supplies. Research, development and engineering costs directly associated with services revenue are classified as cost of research, development and engineering services. A portion of research, development and engineering costs were offset by cost-sharing funding. For the years ended December 31, 2009, 2010 and 2011, the research and development costs that were offset by cost-sharing funding were $2.8 million, $4.9 million and $6.3 million, respectively.

Pre-production engineering, design and development costs for products sold under long-term supply arrangements are expensed as incurred in research, development and engineering expenses in the consolidated statement of operations, unless the Company has a contractual guarantee for reimbursement from the customer. Costs that have a contractual guarantee for reimbursement are capitalized and amortized as a cost of sales over the applicable term. For the years ended December 31, 2010 and 2011, the Company expensed $2.1 million and $2.7 million, respectively, of pre-production costs related to long-term supply arrangements as research, development and engineering expense. There was no expense recorded for the year ended December 31, 2009.

Production start-up—Production start-up expenses consist of manufacturing salaries and personnel-related costs, site selection costs, including legal and regulatory costs, rent and the cost of operating a production line before it has been qualified for production, including the cost of raw materials run through the production line during the qualification phase. During the years ended December 31, 2010 and 2011, the Company incurred production start-up expenses related to its facilities in Livonia and Romulus, Michigan. The Livonia facility began qualification for production in the third quarter of 2010 and the first production line was qualified in December 2010. Since the qualification, expenses related to the first production line in the Livonia facility are no longer included in production start-up expenses. The second production line in the Livonia facility began qualification for production in the first quarter of 2011 and was qualified in July 2011. The Romulus facility began qualification for production in the first quarter of 2011 and was qualified in October 2011. A portion of production start-up expenses was offset primarily by government grant funding. The following table presents

production start-up expenditures included in the Company's consolidated statements of operations (in thousands):

Income Taxes—Deferred tax assets and liabilities are recognized based on temporary differences between the financial reporting and income tax basis of assets and liabilities using rates anticipated to be in effect when such temporary differences reverse. A valuation allowance against net deferred tax assets is required if, based upon the available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized. The Company provides reserves for potential payments of tax to various tax authorities related to uncertain tax positions and other issues. Reserves are based on a determination of whether and how much of a tax benefit taken by the Company in its tax filings or positions is more likely than not to be realized following resolution of any potential contingencies present related to the tax benefit. Potential interest and penalties associated with such uncertain tax positions are recorded as a component of income tax expense.

Guarantees and Indemnifications—Upon issuance of a guarantee, the Company must disclose and recognize a liability for the fair value of the obligation assumed under the guarantee.

As permitted under Delaware law, the Company indemnifies its officers and directors for certain events or occurrences while the officer or director is, or was, serving at the Company's request in such capacity. The term of the indemnification is for the officer's or director's lifetime. The maximum potential amount of future payments the Company could be required to make is unlimited. The Company has directors' and officers' insurance coverage that limits its exposure and enables it to recover a portion of any future amounts paid.

In connection with certain loan agreements, the Company has agreed to indemnify the lender and its representatives against all obligations, demands, claims, and liabilities claimed or asserted by any other party in connection with the loan and all losses incurred by the indemnified party in connection with the execution, delivery, enforcement, performance, and administration of the loan. The term of these indemnification agreements are perpetual. The maximum potential amount of future payments the Company could be required to make under these indemnification agreements is unlimited.

The Company leases facilities under certain noncancelable leases. The Company has agreed under these leases to indemnify the landlord against all costs, expenses, fines, suits, claims, demands, liabilities, and actions arising from or related to the omission, fault, act, negligence, or misconduct (whether under the lease or otherwise) of the Company or of any employee, agent, contractor, licensee, or visitor of the Company; or arising from any accident, injury, or damage whatsoever resulting to any person or property while on or about the Company's premises except to the extent arising from any omission, fault, negligence, or other misconduct of landlord or of landlord's agents, contractors, or employees.

The Company generally agrees to indemnify customers from costs resulting from the products' deviations from specifications, delivery and performance requirements, and any third-party claims arising from the product or violations of specified laws and safety regulations. The amount of indemnification generally is limited to the amount of fees paid to the Company.

The Company has not experienced any losses related to these indemnification obligations, and no claims with respect thereto were outstanding. The Company does not expect significant claims related to these indemnification obligations, and, consequently, concluded that the fair value of these obligations is negligible and no related liabilities were established.

Accumulated Other Comprehensive Loss—Accumulated other comprehensive loss consists of foreign currency translation adjustments attributable to A123 Systems, Inc. The largest portion of the cumulative translation adjustment relates to the Company's Asian operations and reflects the changes in the Chinese Renminbi ("RMB") and Korean Won exchange rates relative to the U.S. Dollar. During the second quarter of 2011, the Company's foreign operations in Asia changed to a U. S. dollar functional currency as a result of the asset transfer and deconsolidation of its joint venture.

Fair Value of Financial Instruments—As of December 31, 2010 and 2011, except for the convertible notes outstanding as of December 31, 2011, the carrying amount of all financial instruments approximate their fair values. The carrying amount of cash, cash equivalents, restricted cash and cash equivalents, accounts receivable, accounts payable and accrued expenses approximates fair value due to the short-term nature of these items. Management believes that the Company's debt obligations, except for the convertible notes outstanding as of December 31, 2011, and the Company's capital lease obligations accrue interest at rates which approximate prevailing market rates for instruments with similar characteristics and, accordingly, the carrying values for these instruments approximate fair value. Investments are accounted for using the cost or equity method. The Company's outstanding convertible notes have an estimated fair value of $51.4 million as of December 31, 2011 based on available market data. As of December 31, 2011, the convertible notes had a carrying value of $140.1 million reflected in long-term debt in the Company's consolidated balance sheet, which reflects the face amount of $143.8 million, net of the unamortized discount.

Fair value is an exit price, representing the amount that would be received from the sale of an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. As a basis for considering such assumptions, GAAP establishes a three-tier value hierarchy, which prioritizes the inputs used in measuring fair value as follows: (Level 1) observable inputs such as quoted prices in active markets; (Level 2) inputs other than the quoted prices in active markets that are observable either directly or indirectly; and (Level 3) unobservable inputs in which there is little or no market data, which requires the Company to develop its own assumptions. This hierarchy requires the Company to use observable market data, when available, and to minimize the use of unobservable inputs when determining fair value. On a recurring basis, the Company measures certain financial assets and liabilities at fair value, including the Company's cash equivalents.

Items Measured at Fair Value on a Nonrecurring Basis—During the year ended December 31, 2011, long-lived assets at the Company's China and Korea facilities and a trade name intangible with an aggregate carrying value of $4.2 million and $0.2 million were written down to their net realizable

value, resulting in an asset impairment charge of $4.4 million. In addition, during the year ended December 31, 2011, the Company recorded an other-than-temporary impairment charge of $11.6 million related to its investment in Fisker Automotive, Inc. The investment is accounted for under the cost method and, as a result of the impairment charge, the carrying value was $8.9 million as of December 31, 2011. These adjustments were determined by comparing the estimated value of the assets (calculated using Level 3 inputs) to the asset's carrying value. There was no impairment charge on the Company's long-term investment during the year ended December 31, 2010.

Items Measured at Fair Value on a Recurring Basis—The following tables show assets measured at fair value on a recurring basis and the input categories associated with those assets (in thousands):

Cash and cash equivalents include investments in money market fund investments that are measured at fair value on a recurring basis based on quoted prices in active markets for identical assets. As of December 31, 2010, the Company held investments in U.S. Treasury and government agency securities that were classified as either cash equivalents or restricted cash equivalents and were measured at fair value based on inputs (other than quoted prices) that are observable for securities, either directly or indirectly. At December 31, 2011, there were no investments held in U.S. Treasury and government agency securities.

Stock-Based Compensation—The Company accounts for all awards, including employee and director awards, by recognizing compensation expense based on the fair value of share-based transactions in the consolidated financial statements. The Company recognizes compensation expense over the vesting period using a ratable method (providing the minimum amount of compensation recorded is equal to the vested portion of the award, requiring a ratable method when necessary) and classifies these amounts in the consolidated statements of operations based on the department to which the related employee reports. The Company uses the Black-Scholes valuation model to calculate the fair value of stock options, utilizing various assumptions. See Note 14 for additional details on Stock-Based Compensation.

The Company records equity instruments issued to non-employees as expense at their fair value over the related service period and periodically revalues the equity instruments as they vest.

Net Loss Per Share—Basic net loss per share is computed by dividing net loss by the weighted-average number of common shares outstanding during the relevant period. Diluted net loss per share is computed by dividing net loss by the weighted-average number of dilutive common shares outstanding during the relevant period. Dilutive shares outstanding are calculated by adding to the weighted shares outstanding any potential (unissued) shares of common stock and warrants based on the treasury stock method.

The following potentially dilutive securities were excluded from the calculation of diluted net loss per share, as the effect would have been anti-dilutive (in thousands):

New Accounting Pronouncements—In September 2011, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Updated ("ASU") No. 2011-08, "Intangibles—Goodwill and Other (Topic 350): Testing Goodwill for Impairment." ASU No. 2011-08 provides companies an option to perform a qualitative assessment to determine whether further goodwill impairment testing is necessary. If, as a result of the qualitative assessment, it is determined that it is more likely than not that a reporting unit's fair value is less than its carrying amount, the two-step quantitative impairment test is required. Otherwise, no further testing is required. ASU No. 2011-08 will be effective for the Company for goodwill impairment tests performed in the fiscal year ending December 31, 2012, with early adoption permitted. The adoption of this guidance is expected to have no impact on the Company's consolidated financial condition and results of operations.

In June 2011, the FASB issued ASU No. 2011-05, "Comprehensive Income (Topic 220): Presentation of Comprehensive Income." ASU No. 2011-05 eliminates the option to present components of other comprehensive income as part of the statement of shareholders' equity. All non-owner changes in shareholders' equity instead must be presented either in a single continuous statement of comprehensive income or in two separate but consecutive statements. Also, reclassification adjustments for items that are reclassified from other comprehensive income to net income must be presented on the face of the financial statements. With the exception of the indefinite deferral of the provisions that require entities to present, in both net income and Other Comprehensive Income, adjustments of items that are reclassified from Other Comprehensive Income to net, income, ASU No. 2011-05 will be effective for the Company for the year ending December 31, 2012. The adoption of this guidance will have no impact on the Company's consolidated financial condition and results of operations.

In May 2011, the FASB issued ASU No. 2011-04, "Fair Value Measurement (Topic 820): Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRSs." ASU No. 2011-04 clarifies and changes the application of various fair value measurement principles and disclosure requirements, and will be effective for the Company for the year ending December 31, 2012. The adoption of this guidance is not expected to have any impact on the Company's consolidated financial condition and results of operations.

In February 2009, the State of Michigan awarded the Company a $10.0 million Center of Energy and Excellence grant. Under the agreement, the State of Michigan will provide cost reimbursement for 100% of qualified expenditures based on the achievement of certain milestones by March 2012. There are no substantive conditions attached to this award that would require repayment of amounts received if such conditions were not met. The Company received $3.0 million of this grant in March 2009 and $6.0 million of this grant in July 2010, with additional payments to be made based on the achievement of certain milestones in the facility development. Through December 31, 2011, the Company has used $8.3 million of these funds, of which $7.9 million and $0.4 million was recorded as an offset to property, plant and equipment and operating expenses, respectively. For the years ended December 31, 2009, 2010 and 2011, $0.1 million, $0.3 million and $0.1 million was recorded as an offset to operating expenses in the consolidated statements of operations, respectively. As of December 31, 2010 and 2011, $0.8 million and $0.7 million of these funds are recorded in short-term restricted cash and other current liabilities on the consolidated balance sheets, respectively.

In April 2009, the Michigan Economic Growth Authority ("MEGA") offered the Company certain tax incentives, which can be used to offset the Michigan Business Tax owed in a tax year, carried forward for the number of years specified by the agreement, or be paid to the Company in cash at the time claimed to the extent the Company does not owe a tax. The terms and conditions of the High-Tech Credit were established in October 2009 and the Cell Manufacturing Credit in November 2009.

High Tech Credit—The High-Tech Credit agreement provides the Company with a 15-year tax credit, based on qualified wages and benefits multiplied by the Michigan personal income tax rate beginning with payments made for the 2011 fiscal year. The proceeds to be received by the Company will be based on the number of jobs created, qualified wages paid and tax rates in effect over the 15 year period. The tax credit is subject to a repayment provision in the event the Company relocates a substantial portion of the jobs outside the state of Michigan on or before December 31, 2026. As of December 31, 2011, $1.0 million was recorded as an undiscounted receivable in long-term grant receivable with an offsetting balance in other long-term liabilities in the consolidated balance sheet. No receivable was recorded as of December 31, 2010. The balance will be recognized in the statements of operations over the term that the Company is required to maintain the required number of jobs in Michigan.

Cell Manufacturing Credit—The Cell Manufacturing Credit agreement authorizes a tax credit or cash for the Company equal to 50% of capital investment expenses related to the construction of the

Company's integrated battery cell manufacturing facilities in Michigan, commencing with costs incurred from January 1, 2009, up to a maximum of $100.0 million over a four year period. The tax credit shall not exceed $25.0 million per year and can be submitted for reimbursement beginning in tax year 2012. The Company is required to create 300 jobs no later than December 31, 2016 for the tax credit to be non-refundable. The tax credit is subject to a repayment provision in the event the Company relocates 51% or more of the 300 jobs outside of the state of Michigan within three years after the last year the tax credit is received. Through December 31, 2011, the Company has incurred $200.0 million in qualified expenses related to the construction of the Livonia and Romulus facilities. When the Company has met the filing requirements for the tax year ending December 31, 2012, the Company expects to begin receiving $100.0 million in proceeds related to these expenses. As of December 31, 2010 and 2011, the Company has recorded undiscounted receivables of $75.8 million and $100.0 million, respectively, as it is reasonably assured that the Company will comply with the conditions of the tax credit and will receive the proceeds. Upon recording the receivables, the Company reduced the basis in the fixed assets acquired in accordance with the tax credit and this will be recognized in the consolidated statements of operations over the estimated useful lives of the depreciable asset as reduced depreciation expense.

The State of Michigan also granted the Company a low interest forgivable loan of up to $4.0 million effective August 2009 with the objective of conducting advance vehicle technology operations to promote and enhance job creation within the State of Michigan. To receive advances under the loan, the Company is required to achieve certain key milestones related to the development of the manufacturing facility. The Company received the $4.0 million under this loan during the year ended December 31, 2011. The note will accrue interest of 1% per annum from the date of the initial advance, and the Company will have no obligation to pay any principal or interest until August 2012. If the Company creates 350 full time jobs by August 2012 and maintains the jobs in the State of Michigan for three years after the end of the loan, the entire debt will be forgiven. As it is reasonably assured that the Company will comply with the conditions of the forgivable loan, the Company reduced the basis in fixed assets acquired by the amount received and this will be recognized in the consolidated statements of operations over the estimated useful lives of the depreciable asset as reduced depreciation expense.

In December 2009, the State of Michigan awarded the Company $2.0 million to assist in funding the Company's smart grid stabilization project, the purpose of which is to develop and improve the quality of application of energy efficient technologies and to create or expand the market for such technologies. The Company received an advance of $0.9 million in December 2009 and another $0.9 million in February 2011. Through December 31, 2011, the Company incurred $1.6 million in allowable costs, which was recorded as an offset to operating expenses. During the year ended, December 31, 2011, the remaining $0.4 million in funding has been cancelled.

In December 2009, the Company entered into an agreement establishing the terms and conditions of a $249.1 million grant awarded under the U.S. Department of Energy ("DOE") Battery Initiative to

support manufacturing expansion of new lithium-ion battery manufacturing facilities in Michigan. Under the agreement, the DOE will provide cost reimbursement for 50% of qualified expenditures incurred from December 1, 2009 to November 30, 2012. The agreement also provides for reimbursement of pre-award costs incurred from June 1, 2009 to November 30, 2009. There are no substantive conditions attached to this award that would require repayment of amounts received if such conditions were not met. Through December 31, 2011, the Company has incurred $216.9 million in capital expenditures and $38.6 million in operating expenses, for a total of $255.5 million in qualified expenses, of which 50%, or $127.8 million, are allowable costs for reimbursement. Nearly all of the allowable costs have been reimbursed. As of December 31, 2010 and 2011, the Company recorded $2.1 million and $0.8 million, respectively, as receivables in prepaid expenses and other current assets in the consolidated balance sheets.

In October 2010, the Company entered into a forgivable loan agreement with Massachusetts Clean Energy Technology Center for $5.0 million for the purpose of funding working capital, capital expenses, and leasehold improvements for the Company's new corporate headquarters and primary research and development center in Waltham, Massachusetts and Energy Solution Group engineering and manufacturing facilities in Westborough, Massachusetts. Amounts borrowed under this agreement accrue interest of 6% from the date of the advance and mature in October 2017. The loan is collateralized by certain designated equipment and a subordinated lien on certain other assets of the Company. Pursuant to the agreement, if the Company creates 263 new jobs in Massachusetts between January 1, 2010 and December 31, 2014 and maintains at least 513 jobs in Massachusetts from January 1, 2015 to the maturity date, $2.5 million of the outstanding principal and accrued interest on the loan will be forgiven. In addition, if the Company spends, or commits to spend, at least $12.5 million in capital expenses or leasehold improvements within one year from closing the loan, $2.5 million of the outstanding principal and accrued interest on the loan will be forgiven. As of December 31, 2011, $2.5 million of the $5.0 million borrowed is recorded as an offset to property, plant and equipment in the consolidated balance sheet to reduce the basis in the fixed assets acquired under the grant as the Company complied with the conditions for the forgiveness of $2.5 million related to the capital expenditure target. The offset to property, plant and equipment will be recognized in the consolidated statements of operations over the estimated useful lives of the depreciable assets as reduced depreciation expense. As the Company is not reasonably assured that it will comply with the conditions of the grant for the forgiveness related to the creation of new jobs in Massachusetts, the remaining $2.5 million is recorded in long-term debt.

The Company's lower of cost or market provision as of December 31, 2010 and, 2011 was $2.2 million and $4.9 million, respectively. The inventory on hand as of December 31, 2011 was written down by $4.9 million to reduce specific inventory items on hand with unit costs that exceed their net realizable value. The net realizable value of inventory is calculated by taking the estimated selling price of the inventory on hand based on customer contracts and forecasted sales and subtracting the remaining costs to complete and dispose of the inventory.

For government grants related to capital expenditures, the Company recognizes the reimbursement as a reduction of the basis of the asset and a reduction to depreciation expense over the useful life of the asset. Property, plant and equipment consists of the following (in thousands):

The Company has deposits for equipment not yet received of $11.6 million and $2.1 million at December 31, 2010 and 2011, respectively, included within deposits and other assets in the consolidated balance sheets. These deposits are reported net of contra deposit balances related to reimbursements under government grants of $1.7 million and $0.1 million at December 31, 2010 and 2011, respectively.

Property, plant and equipment under capital lease consists of the following (in thousands):

Net depreciation expense for the years ended December 31, 2009, 2010 and 2011, $12.3 million, $16.5 million and $25.0 million, respectively. For the years ended December 31, 2009, 2010 and 2011, the Company recorded $0 , $2.0 million and $18.3 million, respectively, as a reduction to depreciation expense related to reduced carrying value due to government grant reimbursements.

There was no change in the carrying value of goodwill during the years ended December 31, 2010 and 2011.

Amortization expense for intangible assets totaled $0.9 million, $0.5 million, and $0.2 million for years ended December 31, 2009, 2010 and 2011, respectively. As of December 31, 2011, the Company has written down the remaining carrying value of the intangible assets.

In January 2010, the Company entered into an agreement to purchase preferred stock of Fisker Automotive, Inc., a maker of plug-in hybrid electric vehicles in the United States ("Fisker"). The Company agreed to invest (i) cash of $13.0 million; and (ii) shares of the Company's common stock, which, when transferred to Fisker, had a fair market value of $7.5 million. As of December 31, 2010, the Company recorded an investment of $20.5 million in the consolidated balance sheets. The Company is accounting for its investment under the cost method. During the year ended December 31, 2011, the Company elected not to participate in Fisker's subsequent stock financing. This election not to participate resulted in the conversion of the Company's preferred shares of Fisker to common shares

on a 2:1 ratio. As such, the Company performed an analysis and valuation of its investment in Fisker resulting to the recognition of an impairment charge of $11.6 million for the year ended December 31, 2011 and an adjusted investment value of $8.9 million as of December 31, 2011.

In December 2009, the Company entered into a joint venture agreement with an automaker in China to assist the Company in growing its business and sales in China's transportation industry and created Shanghai Advanced Traction Battery Systems, Co. Ltd. (the "Joint Venture"). Under the terms of the joint venture agreement, the Company was required to invest $4.7 million into the Joint Venture over a period of approximately 15 months, in return for a 49% interest in the Joint Venture. The Company made the first capital contribution of $1.9 million to the Joint Venture in July 2010 and the second capital contribution of $1.4 million in January 2011. The Company made the final capital contribution of $1.4 million in July 2011. The Company is accounting for its investment in the Joint Venture under the equity method. As of December 31, 2010 and 2011, the carrying value of the investment is $0.9 million and $3.0 million, respectively.

In August 2010, the Company entered into an agreement to transfer certain patents held by the Company to a privately-held company, 24M Technologies, Inc. ("24M"), in return for a 12% ownership interest in 24M. The Company is accounting for its investment in 24M under the equity method as it has determined it has significant influence over the operating and financial decisions of the third party. The Company has recorded the investment on the consolidated balance sheet at the fair value of the ownership interest received net of accumulated losses recognized under the equity method. As of December 31, 2011, the investment had a carrying value of $0.

For the years ended December 31, 2010 and 2011, the Company recorded $1.0 million and $0.8 million in the consolidated statements of operations related to its share of losses in investments accounted for under the equity method. The Company did not record any income or loss related to its investments accounted for under the equity method in the years ended December 31, 2009.

The Company has established a defined contribution savings plan under Section 401(k) of the Internal Revenue Code (the "401(k) Plan"). The 401(k) Plan covers substantially all employees who meet minimum age and service requirements and allows participants to defer a portion of their annual compensation on a pretax basis, subject to legal limitations. Company contributions to the 401(k) Plan may be made at the discretion of the Board of Directors. The Company has made no contributions to the 401(k) Plan.

Employees of the Company's Korean subsidiary with one year or more of service are entitled to receive a lump-sum payment upon termination of their employment with the Company based on the length of service and rate of pay at the time of termination. The annual severance benefits expense charged to operations is calculated based upon the net change in the accrued severance benefits payable at the balance sheet date. As of December 31, 2010 and 2011, the balance of the severance benefit was $1.1 million and $1.0 million, respectively, and is included in other long-term liabilities on the Company's consolidated balance sheets.

Capital Leases—The Company has entered into certain capital lease agreements for computer equipment, software, and buildings. The leases are payable in monthly installments through March 2021.

The recorded balance of capital lease obligations as of December 31, 2010 and 2011 was $20.2 million and $19.1 million, respectively. The Company recorded interest expense in connection with its capital leases of $0.1 million, $0.5 million and $1.8 million for each of the years ended December 31, 2009, 2010 and 2011, respectively.

Future minimum payments under capital leases at December 31, 2011, are as follows (in thousands):

In May 2010, the Company entered into a long-term lease for a facility in Waltham, Massachusetts. The lease is for approximately 97,000 square feet and has an initial term of ten years, which commenced during the first quarter of 2011, with the option to extend for an additional five years. The Company's minimum payments under this lease are expected to be $25.3 million over the initial term. In addition to base rent, the Company is also responsible for its share of electricity cost and its pro rata

share of increases in operating expenses. The landlord provided the Company with an allowance for certain tenant improvement costs, up to $2.1 million. In connection with the Waltham lease, the Company provided the landlord a security deposit of $1.0 million in the form of an irrevocable letter of credit. The Company is accounting for this lease as a capital lease.

In July 2010, the Company entered into a long-term lease for a facility in Westborough, Massachusetts. The lease is for approximately 67,000 square feet. The lease term is from July 2010 through January 2021, and provides for the option to extend for one additional term of five years and the option for the Company to terminate the Westborough lease in February 2016. The Company's minimum payments under this lease are expected to be $4.4 million over the initial term. In addition to the base rent, the Company is also responsible for its share of operating expenses and taxes, including, but not limited to, insurance, real estate taxes, and common area maintenance costs. In connection with the lease, the Company provided a security deposit of approximately $0.2 million to the landlord in the form of an irrevocable, unconditional, negotiable letter of credit. The landlord provided the Company with allowances totaling approximately $0.6 million for certain upgrades and repairs to be made by the Company. The Company is accounting for this lease as a capital lease. In December 2011, the Company entered into an amended agreement to increase the lease space by approximately 22,000 square feet over the original lease term. The minimum payments related to the additional lease space are expected to be $1.5 million. The incremental lease obligation for the additional lease space will be recognized in January 2012 when the lease becomes effective upon the landlord satisfying the conditions of the lease and the Company being granted the right to access the property.

Operating Leases—The Company has non-cancelable operating lease agreements for office, research and development and manufacturing space in the United States, China, and Korea. The Company also has operating leases for certain equipment and automobiles. These lease agreements expire at various dates through 2019 and certain of them contain provisions for extension on substantially the same terms as are in effect. Where leases contain escalation clauses, rent abatements, and/or concessions, such as rent holidays and landlord or tenant incentives or allowances, the Company applies them in the determination of straight-line rent expense over the lease term.

Future minimum payments under operating leases consisted of the following at December 31, 2011 (in thousands):

The Company incurred rent expense under all operating leases of $4.3 million, $5.0 million, and $4.6 million for the years ended December 31, 2009, 2010 and 2011, respectively.

Royalty Obligations—In December 2001, the Company entered into an exclusive worldwide license agreement with a university for certain technology developed by the university. As part of this agreement, the Company has agreed to pay royalties for sales of products using the licensed technology. The royalty payments include minimum guaranteed payments of $50,000 per year. In addition, as payment for this license, the Company issued 200,000 shares of the Company's common stock in December 2001. The term of the agreement shall remain in effect until the expiration of all issued patents. During the years ended December 31, 2009, 2010 and 2011, the Company paid royalties of $0.3 million, $0.4 million, and $1.0 million, respectively.

Additionally, under the terms of the license agreement, the Company is required to reimburse the university for certain legal fees related to the maintenance of the patents. The Company paid the university $0.1 million, $0.1 million and $0.4 million for the years ended December 31, 2009, 2010 and 2011, respectively, for patent legal fees and other related expenses, all of which are included in research and development expense in the accompanying consolidated statements of operations.

On October 31, 2011, the Company entered into a Patent Sublicense Agreement with LiFePO4+C Licensing AG as part of a settlement agreement with Hydro-Quebec and the Board of Regents of the University of Texas System, on behalf of the University of Texas at Austin. As partial consideration of the license grants by LiFePO4+C Licensing AG, the Company will be required to pay royalties to LiFePO4+C Licensing AG commencing as of January 1, 2012 based on a fixed percentage of the Company's cell revenues using licensed lithium metal phosphate materials (plus cell revenues attributed to any permitted sublicensees of the Company). The calculation of the Company's cell revenues will be based on a fixed percentage of the Company's worldwide product revenues. Such fixed percentage may be adjusted by mutual agreement if the Company's standalone cell revenues increase significantly in proportion to overall product revenues.

Purchase Obligations—Purchase obligations include agreements or purchase orders to purchase goods or services that are enforceable and legally binding and specify all significant terms. Purchase obligations exclude agreements that are cancelable without penalty. As of December 31, 2011, the total outstanding purchase obligations, inclusive of the supply agreement described below, were $66.9 million, of which $48.4 million will be settled within the next twelve months. Purchase obligations related to capital equipment purchases may be partially reimbursable under the Company's various government grants.

In June 2010, the Company entered into a supply agreement for a raw material component which included commitments to purchase minimum product volumes for each of the years ending December 31, 2010 through December 31, 2013. If the Company's purchase volumes during any year fail to meet the minimum purchase commitments, it is required to pay the seller a variance payment for the difference between the amount actually purchased in that calendar year and the annual minimum purchase commitment for that calendar year. The Company will receive a credit for the amount of the variance payment to be applied to purchases in the following year and will have until April 1, 2015 to reclaim any variance payments resulting from the minimum purchase commitments for calendar years 2012 or 2013. This arrangement qualifies as a normal purchase and normal sales contract. For the years ended December 31, 2010 and 2011, the Company purchased $4.8 million and $8.5 million under this supply agreement, respectively. As the supplier of raw materials was not able to meet capacity requirements pursuant to the supply agreement, the Company was relieved of their

obligation to meet the minimum purchase commitment for the year ended December 31, 2011. The amounts of purchase commitments remaining under this contract by year are as follows (in thousands):

Litigation—In November 2005, the Company received a letter asserting that it was infringing upon certain U.S. patents. In April 2006, the Company commenced an action in the United States District Court for the District of Massachusetts seeking a declaratory judgment that the patents in question were not infringed by the Company's products and that the patents claiming to be infringed upon are invalid. On September 11, 2006, a countersuit was filed against the Company and two of its business partners in the United States District Court for the Northern District of Texas alleging infringement of these patents. In October 2006 and January 2007, the U.S. Patent and Trademark Office ("PTO") granted the Company's request for reexamination of the two patents. In January and February 2007, the two suits were stayed pending the reexamination. The reexaminations of the two patents were concluded on April 15, 2008 and May 12, 2009, respectively. As a result, the scope of the claims in each patent were narrowed from those of the original claims made. The Company filed a motion to re-open the litigation in the United States District Court for the District of Massachusetts on June 11, 2009. On September 28, 2009, the Massachusetts court entered an order denying that motion, which the Company appealed on October 27, 2009 to the United States Court of Appeals for the Federal Circuit. The United States Court of Appeals for the Federal Court upheld the Massachusetts Court's decision on November 10, 2010. On July 22, 2009, the Company was sent a proposed Second Amended Complaint which the complainants intend to seek leave to file with the Texas court in light of the PTO's reexaminations. On August 27, 2009, Hydro-Quebec and The University of Texas ("UT") filed a Motion for Leave to File Second Amended Complaint and Jury Demand in the United States District Court for the Northern District of Texas and the Company was granted several unopposed extensions to file its response. Hydro-Quebec and UT filed for leave to file an Amended Motion for Leave to File Second Amended Complaint and Jury Demand on April 1, 2010 and the Company filed its opposition to this application on April 22, 2010. On June 7, 2011, Hydro-Quebec filed a new complaint in the United States District Court for the Northern District of Texas against the Company and other companies alleging infringement of a newly-issued continuation patent to one of the patents in the existing action. Hydro-Quebec has amended this complaint to include three additional continuation patents that have subsequently issued.

On June 27, 2011, the parties engaged in a court ordered mediation session in New York City before the Honorable John Lifland, a retired federal judge. On October 31, 2011, the Company entered into a Settlement Agreement and related Patent Sublicense Agreement with LiFePO4+C Licensing AG and with Hydro-Quebec and the Board of Regents of the University of Texas System, on behalf of the University of Texas at Austin.

For the year ended December 31, 2011, the Company recognized a settlement charge of $5.0 million related to this lawsuit which is recorded within general and administrative expense in the

consolidated statement of operations. The Company has paid $3.5 million of the settlement amount during the year ended December 31, 2011 and the remaining $1.5 million, which will be paid in two equal installments in 2013 and 2014, pursuant to the agreement, is recorded in other long-term liabilities in the consolidated balance sheet.

The Company provides for the estimated costs to fulfill customer warranty obligations upon the recognition of the related revenue. While the Company engages in extensive product quality programs and processes, including actively monitoring and evaluating the quality of its component suppliers, the Company's warranty obligation is affected by product failure rates, costs per failure, and supplier warranties on parts delivered to the Company. In developing the warranty estimates for each product, the Company utilizes its failure rate performance for battery systems based on actual warranty experience and an assessment of customer-specific factors that could impact warranty costs. Based on the history of warranty claims, the Company has been able to identify the types of failures that have occurred, when in the product's life cycle they have occurred, and the frequency of its occurrence. Should actual product failure rates, costs per failure, or supplier warranties on parts differ from the Company's estimates, revisions to the estimated warranty liability would be required. As of December 31, 2011, the Company recorded additional accruals related to two customer warranty field campaigns, which impacted its accruals for new and preexisting warranties. One field campaign was instituted to retrofit and upgrade battery packs in order to reduce water intrusion. The other field campaign was related to battery packs that had a potential safety issue involving the battery cooling system.

Product warranty activity, which is recorded in accrued expenses and other long-term liabilities on the consolidated balance sheets, was as follows (in thousands):

The provision for income taxes consists of the following components (in thousands):

Reconciling items from income tax computed at the statutory federal rate were as follows:

Significant components of the Company's deferred tax assets and liabilities are as follows (in thousands):

At December 31, 2011, the Company had $497.3 million of federal net operating losses, $353.9 million of state net operating losses and $4.1 million of credit carryforwards that expire at various dates through 2031. The valuation allowance increased by $54.4 million and $84.1 million during 2010 and 2011, respectively, due to the increase in the net deferred tax assets by the same amounts (primarily due to the increased net operating losses). The net deferred tax assets are classified as other assets in the Company's consolidated balance sheet.

Under the provisions of the Internal Revenue Code, certain substantial changes in the Company's ownership, including a sale of the Company or significant changes in ownership due to sales of equity, may have limited, or may limit in the future, the amount of net operating loss carryforwards which could be used annually to offset future taxable income. The amount of any annual limitation is determined based upon the Company's value prior to an ownership change. The Company has not determined whether there has been such a cumulative change in ownership or the impact on the utilization of the loss carryforwards if such change has occurred.

The Company and its subsidiaries file income tax returns in the U.S. federal jurisdiction, and various states and foreign jurisdictions. With few exceptions, all tax years 2003 through 2011 remain open to examination by U.S. federal, state and local, or non-U.S. tax jurisdictions.

As of December 31, 2011, the Company has provided a liability for $1.0 million for uncertain tax positions related to various foreign income tax matters which are classified as other long-term liabilities in the Company's consolidated balance sheets. The uncertain tax positions as of December 31, 2011 exclude interest and penalties of $0.3 million which are classified as other long-term liabilities on the Company's consolidated balance sheets. These uncertain tax positions would impact the Company's effective tax rate, if recognized. The Company does not expect that the amounts of uncertain tax positions will change significantly within the next 12 months.

A reconciliation of the beginning and ending amount of uncertain tax positions is as follows (in thousands):

The Company recognizes interest and penalties accrued related to uncertain tax positions in the provision for income taxes. During the years ended December 31, 2009, 2010 and 2011, the Company recognized approximately $0.1 million, $0.1 million and $0.1 million in penalties and interest, respectively. The Company had approximately $0.3 million for the payment of penalties and interest included in other long-term liabilities at December 31, 2011.

Convertible Notes—In April 2011, the Company issued $143.8 million in principal of convertible unsecured subordinated notes (the "Convertible Notes"). The Convertible Notes bear interest at 3.75%, which is payable semi-annually in arrears on April 15 and October 15 each year, beginning on October 15, 2011, and mature on April 15, 2016. Holders may surrender their Convertible Notes, in integral multiples of $1,000 principal amount, for conversion any time prior to the close of business on the business day immediately preceding the maturity date. The initial conversion rate of 138.8889 shares of common stock per $1,000 aggregate principal amount of Convertible Notes, equivalent to a conversion price of approximately $7.20 per share of the Company's common stock, is subject to adjustment in certain events. Upon conversion, the Company will deliver shares of common stock. If the Company undergoes a fundamental change (as defined in the prospectus supplement relating to the Convertible Notes), the holders of the Convertible Notes have the option to require the Company to repurchase all or any portion of their Convertible Notes. The Company may not redeem the convertible notes prior to the maturity date.

The Company recorded a debt discount to reflect the value of the underwriter's discounts and commissions. The debt discount is being amortized as interest expense over the term of the Convertible Notes. As of December 31, 2011, the unamortized discount was $3.7 million and the carrying value of the Convertible Notes, net of the unamortized discount, was $140.1 million. During the year ended December 31, 2011, the Company recognized interest expense of $4.6 million related to the Convertible Notes, of which $3.9 million and $0.7 million relate to the contractual coupon interest accrual and the amortization of the discount, respectively.

Term Loan—The Company has an agreement with a financial institution for a term loan facility of $15.0 million. The term loan facility is repayable over a 36-month period and accrues interest at the financial institution's prime rate (which was 4.0% at December 31, 2010 and 2011) plus 0.75%. This term loan facility matures in September 2012. The term loan agreement is collateralized by substantially all assets of the Company, excluding intellectual property, property and equipment owned as of December 31, 2005 and certain equipment located in China.

The term loan agreement requires the Company to comply with certain covenants, which include a minimum liquidity ratio calculation. Additionally, the Company may not create, incur, assume or be liable for indebtedness, except for permitted indebtedness or create, incur or allow any lien on its

property, except for permitted liens. Under the term loan agreement, an event of default would occur if the Company fails to pay any obligation due or fails or neglects to perform, keep or observe any material term provision, condition, covenant or agreement within the term loan agreement, and does not, or is not able to cure the default within the allowed grace period, or a material adverse change in the Company's business occurs. Upon an event of default, the financial institution may declare all obligations immediately due and payable, it may stop advancing money or extending credit or it may apply against the obligation balances and deposits which the Company holds with the financial institution, among other remedies available to the financial institution under the terms of the term loan agreement.

Mass Clean Energy Loan—The Company has a forgivable loan from the Massachusetts Clean Energy Technology Center for $5.0 million. If the Company complies with certain capital expenditure conditions, $2.5 million of the loan will be forgiven and if the Company complies with certain employment conditions an additional $2.5 million will be forgiven. As of December 31, 2010 and December 31, 2011, $2.5 million is recorded as an offset to property, plant and equipment in the consolidated balance sheets as the Company is reasonably assured that the Company will comply with the conditions for the forgiveness related to the capital expenditure condition. On October 18, 2011, an amendment to the Loan and Security Agreement was executed forgiving $2.5 million of the loan as the Company has met the capital expenditure conditions. As of December 31, 2010 and December 31, 2011, the remaining $2.5 million is recorded as long-term debt as the Company is not reasonably assured that it will comply with the employment conditions. The loan has a fixed interest rate of 6.0%, and all funds borrowed under the agreement and accrued interests are due upon maturity in October 2017 if the Company has not complied with the forgiveness conditions.

Future principal payments, excluding unamortized discount of $3.7 million on Convertible Notes, due under the long-term debt agreements at December 31, 2011 are as follows (in thousands):

Revolving Credit Facilities—On September 30, 2011, the Company entered into a Revolving Credit Agreement (the "Agreement"), providing the Company a revolving loan facility in an aggregate principal amount of up to the lesser of (i) $40.0 million or (ii) a Borrowing Base (as defined in the Agreement) established at 80% of certain eligible accounts, 15% of certain eligible foreign accounts and 30% of certain eligible inventory, as more specifically described in the Agreement. The Agreement also provides a letter of credit sub-facility in an aggregate principal amount of up to $10.0 million and

a swing-line loan sub-facility in an aggregate principal amount of up to $5.0 million. Any outstanding obligations under either the letter of credit sub-facility or swing-line sub-facility deduct from the availability under the $40.0 million revolving facility. The Agreement additionally provides a discretionary incremental facility in an aggregate principal amount of not less than $10.0 million and up to $35.0 million. The funding of the incremental facility is discretionary on the part of the Lenders and will depend on market conditions and other factors. The Agreement permits the Company to enter into cash management and hedging agreements with the Lenders. The agreement restricts us from paying cash dividends.

The facilities provided under the Agreement are to be used to refinance the Company's prior outstanding revolving loan facility with the financial institution, dated as of August 2, 2006, and for working capital and general corporate purposes. The maturity date for any revolving cash borrowings under the Agreement is September 30, 2014.

Revolving cash borrowings under the Agreement will bear interest at (i) the Eurodollar Rate (as defined in the Agreement), plus 2.25% (if the Company's liquidity is greater than $75.0 million) or 2.75% (if the Company's liquidity is equal to or less than $75.0 million) per annum, and/or (ii) the base rate (customarily defined), plus 0.50% (if the Company's liquidity is equal to or less than $75.0 million) per annum. The interest rate at December 31, 2011 is 2.62%.

Amounts outstanding under the Agreement (including any cash management or hedging agreements as provided in the Agreement) are secured by substantially all of the Company's existing and future assets, except intellectual property and certain other exceptions as set forth in the Agreement and related security documents.

Additionally, the Company may not create, issue, incur, assume or be liable in respect of or suffer to exist, any indebtedness, except for permitted indebtedness or create, incur, assume or suffer to exist, any lien on its property, except for permitted liens. Under the credit agreement, an event of default would occur if the Company fails to pay any obligation due or fails or neglects to perform, keep or observe any material term provision, condition, covenant or agreement within the credit agreement, and does not, or is not able to remedy the default within the allowed grace period, or a material adverse change in the Company's business occurs. Upon an event of default, the financial institution may declare all obligations immediately due and payable, it may stop advancing money or extending credit or it may apply against the obligation balances and deposits which the Company holds with the financial institution, among other remedies available to the financial institution under the terms of the credit agreement. As of December 31, 2011, the Company was in compliance with all covenants under this facility.

The outstanding balance at December 31, 2010 and December 31, 2011 was $8.0 million and $38.1 million.

During 2009, the Company's Board of Directors approved the 2009 Stock Incentive Plan (the "2009 Plan") which became effective on the closing of the Company's initial public offering ("IPO") on September 24, 2009. The 2009 Plan originally provided for the grant of qualified incentive stock options and nonqualified stock options or other awards to the Company's employees, officers, directors, and outside consultants. Up to an aggregate of 3,000,000 shares of Company's common stock, subject to increase on an annual basis, are reserved for future issuance under the 2009 Plan. During 2010, shares of common stock reserved for issuance under the Company's 2001 Stock Incentive Plan (the "2001 Plan") that remained available for issuance immediately prior to closing of the IPO and any shares of common stock subject to awards under the 2001 Plan that expired, terminated, or were otherwise forfeited, canceled or repurchased by the Company prior to being fully exercised were added to the number of shares available under the 2009 Plan, up to the maximum of 500,000 shares. On January 1, 2010 and 2011, 5,000,000 and 3,000,000 shares, respectively, were added to the 2009 Plan in connection with the annual increase. As of December 31, 2011, the Company had 215,999 stock-based awards available for future grant under the 2009 Plan and no stock-based awards available for future grant under the 2001 Plan.

Stock-based compensation cost is measured at the grant date, based on the calculated fair value of the award, and is recognized as an expense over the service period (generally the vesting period of the equity grant). The Company estimates forfeitures at the time of grant and revises the estimates, if necessary, in subsequent periods if actual forfeitures differ from those estimates. The following table presents stock-based compensation expense included in the Company's consolidated statements of operations (in thousands):

The Company has capitalized an immaterial amount of stock-based compensation as a component of inventory.

As of December 31, 2011 there was approximately $37.3 million of total unrecognized compensation cost related to non-vested stock-based compensation arrangements granted under the plans, which is expected to be recognized over a weighted-average period of 3.18 years.

Stock Options—Stock options generally vest over a four-year period and expire 10 years from the date of grant. Upon option exercise, the Company issues shares of common stock.

The following table summarizes stock option activity for the year ended December 31, 2011:

The Company estimates the fair value of stock options granted using the Black-Scholes option-pricing model and assumptions as to the fair value of the common stock on the grant date, expected term, expected volatility, risk-free rate of interest and an assumed dividend yield.

Prior to the Company's IPO, in determining the exercise prices for awards and options granted, the Company's Board of Directors has considered the fair value of the common stock as of the date of grant. The Board of Directors determined the fair value of the common stock after considering a broad range of factors, including, but not limited to, the prices for the Company's redeemable convertible preferred stock sold to outside investors in arm's-length transactions, the rights, preferences and privileges of that redeemable convertible preferred stock relative to those of the Company's common stock, the Company's operating and financial performance, the hiring of key personnel, the introduction of new products, the Company's stage of development and revenue growth, the lack of an active public market for common and preferred stock, industry information such as market growth and volume, the performance of similarly-situated companies in the Company's industry, the execution of strategic and development agreements, the risks inherent in the development and expansion of our products and services, the prices of our common stock sold to outside investors in arm's-length transactions, and the likelihood of achieving a liquidity event, such as an initial public offering or a sale of the Company given prevailing market conditions and the nature and history of the Company's business. For awards granted subsequent to the Company's IPO, the fair value of the common stock is generally determined based on the closing price of the stock on the NASDAQ Global Select Market on the grant date.

The Black-Scholes model assumptions for each of the periods set forth below are as follows:

The Company derived the risk-free interest rate assumption from the U.S. Treasury's rates for U.S. Treasury zero-coupon bonds with maturities similar to those of the expected term of the awards being valued. The Company based the assumed dividend yield on its expectation of not paying dividends in the foreseeable future. The Company calculated the weighted average expected term of options using the simplified method. This decision was based on the lack of relevant historical data due to the Company's limited operating experience. In addition, due to the Company's limited historical data, the estimated volatility also reflects the application of the Stock Compensation Subtopic, incorporating the historical volatility of comparable companies with publicly-available share prices.

The weighted average grant date fair value of options granted during the years ended December 31, 2009, 2010 and 2011 was $7.24, $6.55 and $3.30 respectively. The intrinsic value of options exercised during the years ended December 31, 2009, 2010 and 2011 was $1.7 million, $26.1 million and $3.7 million, respectively. The Company received $0.4 million, $4.3 million and $2.0 million in cash from option exercises during the years ended December 31, 2009, 2010 and 2011.

Restricted Stock Units—The Company's restricted stock unit awards generally vest over a four-year period and upon vesting the Company issues shares of common stock. The following table summarizes the Company's restricted stock unit award activity for the nine months ended December 31, 2011:

The fair value of restricted stock unit awards is determined based on the closing price of the Company's common stock on the NASDAQ Global Select Market on the grant date.

The following is the activity of the Company's redeemable convertible preferred stock for the year ended December 31, 2009 (in thousands):

	Redeemable Convertible Preferred Stock

	Series A						Series A-1						Series B						Series C						Series D						Series E						Series F
	Shares			Amount			Shares			Amount			Shares			Amount			Shares			Amount			Shares			Amount			Shares			Amount			Shares			Amount			Total
Balance—January 1, 2009		8,312			8,375			2,925			4,352			9,624			19,996			8,988			30,281			10,670			69,941			6,153			102,009			—			—			234,954
Sale of series F redeemable convertible preferred stock, net of issuance costs of $262		—			—			—			—			—			—			—			—			—			—			—			—			10,862			99,590			99,590
Accretion of redeemable convertible preferred stock to redemption value		—			1			—			5			—			1			—			2			—			8			—			11			—			17			45
Conversion of redeemable convertible preferred stock to common stock		(8,312	)		(8,376	)		(2,925	)		(4,357	)		(9,624	)		(19,997	)		(8,988	)		(30,283	)		(10,670	)		(69,949	)		(6,153	)		(102,020	)		(10,862	)		(99,607	)		(334,589	)

Balance—December 31, 2009		—		$	—			—		$	—			—		$	—			—		$	—			—		$	—			—		$	—			—		$	—		$	—

During 2009, the Company authorized and issued 10.9 million shares of Series F at $9.20 per share, for gross proceeds of $99.9 million. The total direct costs related to the issuance of Series F were approximately $0.3 million.

On September 29, 2009, in conjunction with the closing of the Company's IPO, all of the Company's 57,533,713 outstanding redeemable convertible preferred shares automatically converted on a one-for-one basis, except for Series E redeemable convertible preferred stock, which converted on a one-for-1.38 basis, into 59,881,160 shares of common stock. At December 31, 2009, 2010 and 2011, the Company had no redeemable convertible preferred shares outstanding.

Pursuant to a subscription agreement, in January and February 2008, the Company issued 693,000 and 900,000 shares of common stock to investors, respectively, at $7.22 per share, for gross proceeds of $11.5 million. The redemption right of the redeemable common stock would terminate upon an effective registration statement filed by the Company under the Securities Act of 1933 in connection with a public stock offering. The redemption rights of the redeemable common stock terminated on September 29, 2009 in connection with the IPO. At December 31, 2009, 2010 and 2011, the Company had no redeemable common stock outstanding.

Issuance of Common Stock—On September 29, 2009, the Company closed its initial public offering of common stock of 32,407,576 shares of common stock at an offering price of $13.50 per share, of which 31,727,075 shares were sold by the Company and 680,501 shares were sold by selling stockholders, resulting in net proceeds to the Company of approximately $391.8 million, after deducting underwriting discounts and offering costs.

During the year ended December 31, 2010, the Company issued 479,282 shares of its common stock in conjunction with cash to the Automaker as consideration for an investment in the Automaker's preferred stock. In April 2011, the Company closed the public offering of a total of 20,184,067 shares of common stock which were sold at a price of $6.00 per share. The aggregate net proceeds from the public offering, including shares sold under the underwriters' option, was $115.2 million. Additionally, in November 2011, the Company issued 8,237,232 shares of its common stock to the IHI Corporation for a $25.0 million investment in the Company's common stock pursuant to a stock purchase agreement which closed on November 18, 2011.

Transactions with Holders of Common Stock—In November 2011, the Company entered into a technology license agreement, a product supply agreement and a stock purchase agreement with an industrial equipment manufacturer located in Japan (the "Japanese Equipment Manufacturer"). The Japanese Equipment Manufacturer agreed to make a $25.0 million equity investment in the Company's common stock under the stock purchase agreement, which closed on November 18, 2011. The Company will exclusively license, for an initial term of 10 years, its advance battery system technology and systems integration know-how to manufacture battery systems and modules for the transportation market in Japan for a one-time non-refundable license fee of $7.5 million. During the license term, the

Company will also receive royalty payments based on a percentage of the Japanese Equipment Manufacturer's net sales of products that use or embody the licensed technology and know-how. The Company will be the exclusive supplier of lithium ion battery cells to the Japanese Equipment Manufacturer under a product supply agreement for the battery systems and modules that the Japanese Equipment Manufacturer produces. During the year ended December 31, 2011, the Company recorded $2.8 million of revenue related to development contracts and supply agreements preceding the November 2011 agreements. As of December 31, 2011, the balance due of $1.6 million from the Japanese Equipment Manufacturer is included within accounts receivable, net on the consolidated balance sheets. As of December 31, 2011, $7.5 million of the technology license fee is recorded in deferred revenue. Revenue on the license fee will be amortized over the license term expected to commence in 2012.

Transactions with Joint Venture Partner's Affiliate—In December 2009, the Company entered into a joint venture (the "Joint Venture") with an automaker in China (the "Chinese Automaker") to assist the Company in growing business and sales in China's transportation industry. The Company entered into two development agreements with the Chinese Automaker. During the years ended December 31, 2009, 2010 and 2011, the Company recorded revenue related to the development and supply agreements with the Chinese Automaker of $0.1 million, $2.2 million and $0.4 million, respectively. As of December 31, 2010, $0.5 million was recorded in deferred revenue on the consolidated balance sheets related to the development and supply agreements. There was no deferred revenue as of December 31, 2011. As of December 31, 2010 and 2011, the balance due from the Chinese Automaker was $1.9 million and $0.1 million, respectively, which is included within accounts receivable, net on the consolidated balance sheets.

Transactions with Cost-Method Investment—In January 2010, the Company entered into a supply agreement with the Automaker in which the Company also holds an investment accounted for under the cost method. The Company recognizes revenue on product shipments to the Automaker, within the consolidated statements of operations, when all revenue recognition criteria are met. During the years ended December 31, 2010 and 2011 the Company recorded $1.7 million and $41.0 million of revenue from the Automaker, respectively. No revenue from the Automaker was recorded in 2009. At December 31, 2010 and 2011, the Company has deferred $0.4 million and $3.7 million, respectively, of service and product revenue related to the supply agreement. The balance due from the Automaker as of December 31, 2010 and 2011, of $0.6 million and $3.7 million, respectively, is included within accounts receivable, net on the consolidated balance sheets.

Transactions with Equity-Method Investment—During March 2010, the Company entered into a technology license contract to license certain patents and technology to the Company's Joint Venture for the term of the Joint Venture, which extends to April 28, 2030. In conjunction with the license agreement, the Joint Venture paid the Company the first payment of the license fee of $1.0 million in July 2010. Revenue on the license fee will be amortized over the term of the license. Revenue recognition is expected to commence upon the successful completion of training provided to employees of the Joint Venture. As of December 31, 2010 and 2011, the $1.0 million of the license fee is recorded in deferred revenue on the consolidated balance sheets. During December 2010, the Company entered into a service agreement to provide technical development, design, analysis and consultation services to the Joint Venture. Additionally, the Company entered into an agreement to provide sample battery system packs to the Joint Venture. For the years ended December 31, 2010 and 2011, the Company has

recognized $0.2 million and $4.4 million of service and product revenue from the Joint Venture. The Company did not recognize any service or product revenue from the Joint Venture for the year ended December 31, 2009. At December 31, 2010 the Company deferred $0.2 million of service and product revenue related to the service agreement and initial sample shipments. There was no deferred revenue as of December 31, 2011. As of December 31, 2010 and 2011, $0.5 million and $1.5 million are included within accounts receivable, net on the consolidated balance sheets for amounts due from the Joint Venture.

The following information has been derived from unaudited consolidated financial statements that, in the opinion of management, include all recurring adjustments necessary for a fair statement of such information (in thousands, except per share amounts):

Quarter Ended	March 31,			June 30,			September 30,			December 31,			Total

Fiscal year 2011
Revenue	$	18,097		$	36,353		$	64,319		$	40,378		$	159,147
Gross loss		(15,477	)		(17,531	)		(19,573	)		(37,467	)		(90,048	)
Net loss		(53,673	)		(55,390	)		(63,717	)		(84,977	)		(257,757	)
Net loss attributable to A123 Systems, Inc. common stockholders		(53,646	)		(55,390	)		(63,717	)		(84,977	)		(257,730	)
Net loss per share attributable to A123 Systems, Inc. common stockholders—basic and diluted	$	(0.51	)	$	(0.44	)	$	(0.51	)	$	(0.65	)	$	(2.12	)

Fiscal year 2010
Revenue	$	24,468		$	22,608		$	26,218		$	24,018		$	97,312
Gross loss		(2,041	)		(2,949	)		(3,075	)		(9,374	)		(17,439	)
Net loss		(29,102	)		(34,287	)		(43,735	)		(45,813	)		(152,937	)
Net loss attributable to A123 Systems, Inc. common stockholders		(29,025	)		(34,218	)		(43,656	)		(45,661	)		(152,560	)
Net loss per share attributable to A123 Systems, Inc. common stockholders—basic and diluted	$	(0.28	)	$	(0.33	)	$	(0.42	)	$	(0.43	)	$	(1.46	)

Fiscal year 2009
Revenue	$	23,220		$	19,702		$	23,597		$	24,530		$	91,049
Gross profit (loss)		1,806			(2,575	)		(1,875	)		(48	)		(2,692	)
Net loss		(18,884	)		(22,340	)		(22,891	)		(22,474	)		(86,589	)
Net loss attributable to A123 Systems, Inc. common stockholders		(18,748	)		(21,930	)		(22,815	)		(22,331	)		(85,824	)
Net loss per share attributable to A123 Systems, Inc. common stockholders—basic and diluted	$	(2.02	)	$	(2.36	)	$	(1.78	)	$	(0.20	)	$	(2.55	)

On January 25, 2012, the Company sold an aggregate of 12,500,000 units to an institutional investor at a negotiated price of $2.034 per unit, with each unit consisting of (i) one share of its common stock ("Common Stock") and (ii) one warrant to purchase one share of Common Stock, in a registered direct offering for gross proceeds of approximately $25.4 million. The net proceeds to the Company from the sale of the units, after deducting the placement agent's fees and other estimated offering expenses, was approximately $23.5 million.

The warrants have an exercise price of $2.71 per share, and the warrants can be exercised beginning on the date that is six months and one day after the initial closing date and will expire 24 months after the date on which they become exercisable. In addition, during a ten trading day period approximately five months following the initial closing date of the transaction and during another ten day trading period approximately six months following the initial closing date of the transaction, the Company has the right, subject to certain conditions, to require the investors to purchase in each such period up to an additional 6,250,000 shares of Common Stock, for an aggregate of up to 12,500,000 additional shares of Common Stock. The sale price for the additional shares will be based on a fixed 10% discount to a volume weighted average price measurement at the time the Company exercises each such right. The Company cannot require the investor to purchase more than $100.0 million of additional shares.

On March 6, 2012, the Company entered into the First Amendment to its Revolving Credit Agreement that was previously established on September 30, 2011. The amendment extends the Revolving Termination Date of the agreement to June 1, 2013.

The amendment increases all applicable interest rates by 0.50%, such that the revolving cash borrowings under the Agreement now bear interest at (i) the Eurodollar Rate (as defined in the Agreement), plus 2.75% (if the Company's liquidity is greater than $75.0 million) or 3.25% (if the Company's liquidity is equal to or less than $75.0 million) per annum, and/or (ii) the base rate (customarily defined), plus 0.50% (if the Company's liquidity is greater than $75.0 million) or 1.00% (if the Company's liquidity is equal to or less than $75.0 million) per annum.

The eligible inventory component of the Borrowing Base (as defined in the Agreement) formula remains capped at 30% of the entire Borrowing Base, but the previous limitation on this eligible inventory component increased from 20% of all outstanding revolving extensions of credit to the lesser of $8.0 million or 50% of all outstanding revolving extensions of credit. Also, the required Consolidated Tangible Net Worth (as defined in the Agreement) that the Company must maintain decreased from $400.0 million to $300.0 million.

Item 9. Changes in and Disagreements With Accountants on Accounting and Financial Disclosure.

Our management, with the participation and supervision of our Chief Executive Officer and Chief Financial Officer, is responsible for our disclosure controls and procedures pursuant to Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the "Exchange Act"). Disclosure controls and procedures are controls and other procedures that are designed to ensure that information required to be disclosed in our reports filed or submitted under the Exchange Act is recorded, processed, summarized and reported, within the time periods specified under the Securities and Exchange Commission's rules and forms. Disclosure controls and procedures included controls and procedures designed to ensure that information required to be disclosed in our reports filed under the Exchange Act is accumulated and communicated to our principal executive officer and our principal financial officer, as appropriate, to allow timely decisions regarding required disclosure.

Our management, including the Chief Executive Officer and the Chief Financial Officer, carried out an evaluation of the effectiveness of our disclosure controls and procedures as of December 31, 2011. Based on this evaluation, our management concluded that as of December 31, 2011, that these disclosure controls and procedures were not effective at the reasonable assurance level as a result of the material weakness in our internal control over financial reporting, which we view as an integral part of our disclosure controls and procedures, discussed in further detail below.

Our management is responsible for establishing and maintaining adequate internal control over our financial reporting, as defined in Rule 13a-15(f) under the Exchange Act. Internal control over financial reporting is a process designed by, or under the supervision of, the Company's principal executive and principal financial officers, or persons performing similar functions, and effected by the Company's board of directors, management, and other personnel, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with GAAP and includes those policies and procedures that:

Because of inherent limitations, no matter how well designed and operated, internal control over financial reporting may not prevent or detect misstatements and can only provide reasonable assurance of achieving the desired control objectives. In addition, the design of internal control over financial reporting must reflect the fact that there are resource constraints and that management is required to apply its judgment in evaluating the benefits of possible controls and procedures relative to their costs.

Our Chief Executive Officer and Chief Financial Officer have performed an evaluation of our internal control over financial reporting under the framework in Internal Control—Integrated Framework,

issued by the Committee of Sponsoring Organizations of the Treadway Commission. The objective of this assessment was to determine whether our internal control over financial reporting was effective at December 31, 2011.

A material weakness is a deficiency, or combination of deficiencies, in internal control over financial reporting such that there is a reasonable possibility that a material misstatement of our annual or interim consolidated financial statements will not be prevented or detected on a timely basis. In our assessment of the effectiveness of internal control over financial reporting at December 31, 2011, we identified the following material weakness:

We have not designed or maintained effective internal controls over the financial statement close and reporting process. Such controls are necessary to ensure the accurate and timely preparation of financial statements in accordance with Generally Accepted Accounting Principles. The following deficiencies contribute to the material weakness:

These deficiencies collectively result in a reasonable possibility that a material misstatement in our annual or interim consolidated financial statements may not be prevented or detected on a timely basis.

Based on our assessment, and because of the material weakness described above, we have concluded that our internal control over financial reporting was not effective at December 31, 2011.

Our independent registered public accounting firm, Deloitte & Touche, LLP, has audited our consolidated financial statements and has issued an attestation report on our internal controls over financial reporting as of December 31, 2011, which report is included herein.

Over the past several years, our business has been in transition as we are expanding our internal infrastructure to support future growth and more complex business operations. This overall growth and increase in complexity of our business and its operations has strained our control structure, including the structure that supports the effective operation of internal controls over accounting and financial reporting processes. In response to this, we have implemented a number of manual controls, analyses and other post-closing procedures designed to mitigate the risks of a material misstatement to our financial statements occurring and not being detected. However, these manual controls alone may not

be sufficient to prevent and detect all potential material misstatements that could occur. As a result, our financial reporting process is more prone to misstatements occurring without being detected.

As disclosed in our Annual Report on Form 10-K for the year ended December 31, 2010, filed with the SEC on March 11, 2011, we previously identified a material weakness related to our internal control over financial reporting. During the year ended December 31, 2011, we made extensive improvements in our internal control over our financial reporting including:

Notwithstanding our remediation activities, the Company has concluded that adequate improvement has not yet been made to remediate the previously identified material weakness and has determined as of December 31, 2011 that, collectively, the control deficiencies that existed in the prior year still aggregate to the material weakness described in management's report above. Additionally, in our ongoing effort to improve our financial reporting process, we have identified other deficiencies contributing to this material weakness, which relate to design and implementation of key controls to ensure the timely communications of operating issues that could have a material impact on our financial statements and the design and implementation of an adequate fraud risk assessment and related enterprise-wide fraud risk management program.

Overall, the steps described above have enhanced the overall effectiveness of our internal control over financial reporting. However, certain controls designed and implemented during the year to address the previously identified material weakness in the period-end financial reporting process have not been operational for a sufficient period of time to allow management to conclude that they are operating effectively. In addition, due to the overall growth in our business and increased complexity, we have not fully designed and implemented all controls at a level of precision necessary for management to conclude that a material misstatement in the financial statements would be prevented or detected on a timely basis. As such, management determined that our internal controls do not effectively mitigate the risk that a material misstatement in our financial statements could occur and not be prevented or detected.

To address the material weakness in our internal control over financial reporting described above, we performed additional analyses and other post-closing procedures designed to provide reasonable assurance that our consolidated financial statements were prepared in accordance with GAAP. As a result of these procedures, we believe that the consolidated financial statements included in this Annual Report on Form 10-K for the year ended December 31, 2011 fairly present, in all material respects, our financial position, results of operations and cash flow for the periods presented in conformity with GAAP.

We intend to continue to take appropriate and reasonable steps to make necessary improvements tour internal control over financial reporting, including:

We expect that our remediation efforts, including design, implementation and testing will continue throughout fiscal year 2012. As we scale our operations to support a larger and more complex business, and concurrently adapt our control environment to these changes, we plan to increase our utilization of information systems and automated controls.

We believe that the remediation measures described above will strengthen our internal control over financial reporting and remediate the material weakness we have identified. We are committed to continuing to improve our internal control processes and will continue to diligently review our financial controls and procedures. As we continue to evaluate and work to improve our internal control over financial reporting, we may take additional measures to address control deficiencies and upgrade or enhance existing internal controls as our business grows.

There were no changes in our internal control over financial reporting, other than those stated above, during our most recent fiscal quarter that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

To the Board of Directors and Stockholders of
A123 Systems, Inc.
Waltham, Massachusetts

We have audited A123 Systems, Inc.'s and subsidiaries' (the "Company's") internal control over financial reporting as of December 31, 2011, based on the criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission. The Company's management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, including the accompanying Management's Annual 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 that risk, and performing such other procedures as we considered necessary in the circumstances. We believe our audit provide a reasonable basis for our opinion.

A company's internal control over financial reporting is a process designed by, or under the supervision of, the company's principal executive and principal financial officers, or persons performing similar functions, and effected by the company's board of directors, management, and other personnel 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 the inherent limitations of internal control over financial reporting, including the possibility of collusion or improper management override of controls, material misstatements due to error or fraud may not be prevented or detected on a timely basis. Also, projections of any evaluation of the effectiveness of the internal control over financial reporting to future periods are subject to the risk that the controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

A material weakness is a deficiency, or a combination of deficiencies, in internal control over financial reporting, such that there is a reasonable possibility that a material misstatement of the company's annual or interim financial statements will not be prevented or detected on a timely basis. The following material weakness has been identified and included in management's assessment: The Company has not designed or maintained effective internal controls over the financial statement close and reporting process. The following deficiencies contribute to the material weakness, i) the Company's had significant turnover in several key financial roles, including Chief Finance Officer and Chief Accounting Officer. The new finance team has not had sufficient time to complete the reorganization of the finance and accounting departments, train employees on their new roles and responsibilities, and

design and implement all controls necessary to mitigate the risk of a material misstatement, ii) the Company's design and implementation of certain controls are incomplete or overly reliant on manual reviews and the Company had insufficient time to determine if controls developed throughout 2011 were implemented and operating effectively, iii) the Company has not yet designed and implemented certain key information technology controls, including controls in certain manufacturing locations, access controls, and change management controls; and the departure of the Company's Chief Information Officer further delayed the design and implementation of these controls, iv) the Company has not designed and implemented key controls to ensure the timely communications of operating issues that could have a material impact on its financial statements and disclosures, and v) the Company did not perform an adequate fraud risk assessment or design and maintain a comprehensive, enterprise-wide fraud risk management program to sufficiently mitigate its fraud risks and exposures. These deficiencies collectively result in a reasonable possibility that a material misstatement in the Company's interim or annual financial statements may not be prevented or detected on a timely basis. This material weakness was considered in determining the nature, timing, and extent of audit tests applied in our audit of the consolidated financial statements as of and for the year ended December 31, 2011, of the Company and this report does not affect our report on such financial statements.

In our opinion, because of the effect of the material weakness identified above on the achievement of the objectives of the control criteria, the Company has not maintained effective internal control over financial reporting as of December 31, 2011, based on the criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated financial statements as of and for the year ended December 31, 2011, of the Company and our report dated March 12, 2012 expressed an unqualified opinion on those financial statements.

The following table sets forth information regarding our executive officers and directors, including their ages as of December 31, 2011.

Name		Position

David P. Vieau	61	President, Chief Executive Officer, Director
David Prystash	50	Chief Financial Officer
Richard E. Johnson	49	Vice President, Global Controller and Principal Accounting Officer
Andrew Cole	46	Vice President of Human Resources and Organizational Development
Louis M. Golato	56	Vice President of Operations
Robert J. Johnson	45	Vice President and General Manager of Energy Solutions Group
Gilbert N. Riley, Jr.	48	Chief Technology Officer, Vice President of Research and Development, Director
Jason M. Forcier	40	Vice President, Automotive Solutions Group
Eric J. Pyenson	55	Vice President and General Counsel
Gururaj Deshpande⁽²⁾⁽³⁾	61	Director
Arthur L. Goldstein⁽¹⁾⁽³⁾	76	Director
Gary E. Haroian⁽¹⁾⁽²⁾	60	Director
Paul E. Jacobs⁽³⁾	49	Director
Mark M. Little	59	Director
Jeffrey P. McCarthy⁽¹⁾⁽²⁾	57	Director

The following paragraphs provide information about our directors and executive officers. For each director, the information presented includes information each director has given us about the positions they hold, their principal occupation and business experience for the past five years, and the names of other publicly-held companies of which they currently serves as a director or has served as a director during the past five years. In addition to the information presented below regarding each director's specific experience, qualifications, attributes and skills that led our board of directors to the conclusion that they should serve as a director, we also believe that all of our directors have a reputation for integrity, honesty and adherence to high ethical standards. They each have demonstrated business acumen and an ability to exercise sound judgment, as well as a commitment of service. Finally, we value their significant experience on other public company boards of directors and board committees.

David P. Vieau has served as our President and Chief Executive Officer and as a director since March 2002. Mr. Vieau served as a director of Avocent Corporation, an information technology infrastructure management company, from 2001 to December 2009. Mr. Vieau holds a B.S. in Mechanical Engineering from Syracuse University. We believe that Mr. Vieau's qualifications to sit on our board of directors include his 30 years of experience managing high technology and component businesses, including his ten years as our Chief Executive Officer.

David Prystash has served as our Chief Financial Officer since May 2011. Mr. Prystash served as senior vice president and chief financial officer of NewPage Corporation, a coated paper manufacturer, from September 2008 to April 2011. Prior to that, Mr. Prystash was controller, global product development, at Ford Motor Company from January 2005 to September 2008. Mr. Prystash received a bachelor's degree in administrative and managerial science and a master's degree in industrial administration from Carnegie Mellon University.

Richard E. Johnson has served as our Vice President, Global Controller and Principal Accounting Officer since July 2011. From February 2008 to May 2011, Mr. Johnson served as the Vice President, Finance and Corporate Controller for GT Advanced Technologies, Inc. ("GTAT"). Mr. Johnson also served as the principal accounting officer for GTAT from June 2008 to May 2011 and the Chief Accounting Officer for GTAT from March 2010 to May 2011. Prior to that, Mr. Johnson served in several senior financial positions with Ocean Spray Cranberries, Inc. since May 2002, including most recently, as the Director, Corporate Controller from August 2004 until February 2008. Mr. Johnson holds a B.S. in Accountancy from Bentley University and an MBA from Southern New Hampshire University.

Andrew Cole served as our Vice President of Human Resources and Organizational Development from August 2008 to February 2012. From May 2008 to August 2008, Mr. Cole served as Global Seminis Human Resources Lead at the Monsanto Company, an agricultural company. From February 2007 to February 2008, Mr. Cole served as Senior Vice President for Human Resources at The Power and Cooling Division of Schneider Electric AS, or Schneider Electric, an energy management company. Prior to this role, Mr. Cole served as the Executive Vice President for Human Resources and Organizational Development at American Power Conversion Corp., or APC, an energy management company, from April 2003 until the acquisition of APC by Schneider Electric in February 2007. Mr. Cole holds a B.A. and an M.S.M from Regis University, Colorado.

Louis M. Golato has served as our Vice President of Operations since February 2006. From February 2004 to December 2005, Mr. Golato served as Wafer Fabrication and Probe Site Manager of Texas Instruments Incorporated, a semiconductor company. Mr. Golato holds a B.S. in Accounting from Bryant College.

Robert J. Johnson has served as our Vice President and General Manager of our Energy Solutions Group since January 2008. From February 2007 to January 2008, Mr. Johnson served as Senior Vice President, President North America of APC-MGE Systems, a business unit of Schneider Electric and a global provider of critical power and cooling services. From February 1997 to February 2007, Mr. Johnson served in various roles at American Power Conversion Corp., or APC, including President/CEO and Vice President of APC's Availability Enhancement Group. Mr. Johnson holds a Bachelor of Engineering Management degree from The Missouri University of Science and Technology.

Gilbert N. Riley, Jr. co-founded A123 and has served as our Chief Technology Officer and Vice President of Research and as a director since October 2001. Dr. Riley holds a B.A. in Physics and Geology from Middlebury College and an M.S. and a Ph.D. in Materials Science and Engineering from Cornell University. Prior to founding A123, Dr. Riley served in a range of technical and management positions at AMSC spanning research and development, business development and program management. Dr. Riley holds 55 patents in advanced materials and energy technology. We believe that Dr. Riley's qualifications to sit on our board of directors include his experience in technology development and commercialization, including his nine years as our Chief Technology and Vice President of Research.

Jason M. Forcier has served as our Vice President, Automotive Solutions Group since August 2009. From August 2008 to August 2009, Mr. Forcier served as Vice President & General Manager for Lear Corporation, a global supplier of automotive seating systems, electrical distribution systems and electronics. Prior to Lear, Mr. Forcier worked at Robert Bosch LLC, a supplier of automobile

components, from 1997 through 2008 in various management positions in the United States and Europe. His last position at Bosch was President for North America, Automotive Electronics Division. In addition, Mr. Forcier held engineering positions at General Motors, Delphi Division. Mr. Forcier holds an MBA from the University of Michigan and a Bachelor of Mechanical Engineering from Kettering University.

Eric J. Pyenson has served as our Vice President and General Counsel since March 2007. From September 2001 to March 2007, Mr. Pyenson served as Vice President and General Counsel for Authoria Inc., a software company. Mr. Pyenson holds a B.A. in English from Williams College, a M.A. in International Relations from the University of Sussex, England, and a J.D. from Northeastern University School of Law. He is a member of the Massachusetts bar.

Gururaj Deshpande has served as a director since December 2001. Since November 2009, Dr. Deshpande has served as President of Sparta Group MA LLC, a private investment entity. Dr. Deshpande has served as Chairman of the board of directors of Sycamore Networks, Inc., a telecommunications equipment manufacturer, since February 1998. Dr. Deshpande also served on the board of directors of Airvana, Inc., a provider of network infrastructure products used by wireless carriers, from May 2000 to April 2010. Dr. Deshpande co-founded Cascade Communications Corp., a provider of wide area network switches, and was a member of the board of directors of Cascade from 1990 to 1997 and was Chairman of the board of directors of Cascade from 1996 to 1997. Dr. Deshpande holds a B.S. in Electrical Engineering from the Indian Institute of Technology, an M.E. in Electrical Engineering from the University of New Brunswick and a Ph.D. in Data Communications from Queens University. We believe that Dr. Deshpande's qualifications to sit on our board of directors include his vast experience as an entrepreneur and in the various executive management positions he has held.

Arthur L. Goldstein has served as a director since February 2008. Mr. Goldstein has served as a trustee, director and/or advisor for various for-profit and non-profit organizations. From May 1991 to May 2004, Mr. Goldstein served as the Chairman of the board of directors of Ionics, Inc., or Ionics, a water treatment and purification company. From May 1971 to June 2003, Mr. Goldstein served as the President and Chief Executive Officer of Ionics. From 1995 to 2011, Mr. Goldstein served as a director of Cabot Corporation, a chemical manufacturer. From 1995 to 2008, Mr. Goldstein served as a member of the board of directors of State Street Corporation, a financial services company. He is a member of the National Academy of Engineering and the American Academy of Arts and Sciences. Mr. Goldstein holds a B.S. in Chemical Engineering from Rensselaer Polytechnic Institute, an M.S. in Chemical Engineering from the University of Delaware and an M.B.A. from Harvard Business School. We believe that Mr. Goldstein's qualifications to sit on our board of directors include his years of executive experience in the chemical manufacturing and solutions industries.

Gary E. Haroian has served as a director since July 2006. Since December 2002, Mr. Haroian has provided consulting and advisory services to various technology companies. Mr. Haroian also serves as a director of Aspen Technology Inc., a provider of software and services to the process industries and Network Engines, Inc., a provider of server appliance software solutions. Until 2010, Mr. Haroian also served as a director of Phase Forward Incorporated, a provider of data collection and management solutions for clinical trials and drug safety and Unica Corp, a provider of enterprise marketing management software and served as a member of the Merger and Acquisition committee for both companies prior to their acquisitions in 2010. Until 2007, Mr. Haroian also served as a director of Authorize.net, a transaction and payment processing company, and Embarcadero Technologies, Inc., a provider of data lifecycle management software. Mr. Haroian holds a B.S. in Economics and Accounting from the University of Massachusetts, Amherst. We believe that Mr. Haroian's qualifications to sit on our board of directors include his extensive advisory experience to various emerging technology companies and his financial and accounting expertise.

Paul E. Jacobs has served as a director since November 2002. Since February 2000, Dr. Jacobs has held a number of executive positions with QUALCOMM Incorporated, or Qualcomm, including Group President of the Qualcomm Wireless & Internet Group, Executive Vice President and Chief Executive Officer. Dr. Jacobs also serves as a director and as Chairman of Qualcomm. Dr. Jacobs holds a B.S. in Electrical Engineering and Computer Science, an M.S. in Electrical Engineering and a Ph.D. in Electrical Engineering and Computer Science from the University of California, Berkeley. We believe Mr. Jacobs' qualifications to sit on our board of directors include his experience as director and Chairman of a mobile communication company and his expertise in strategic leadership.

Mark M. Little has served as a director since April 2009. Since October 2005, Dr. Little has served as Senior Vice President and Director of GE Global Research, a division of General Electric Company, a diversified technology and financial services company. From February 1997 to October 2005, Dr. Little served as Vice President of the power-generation segment of GE Energy, another division of General Electric. Dr. Little holds a B.S. in Mechanical Engineering from Tufts University, an M.S. in Mechanical Engineering from Northeastern University and a Ph.D. from in Mechanical Engineering from Rensselaer Polytechnic Institute. We believe Mr. Little's qualifications to sit on our board of directors include his management experience in the industrial research and technology industries.

Jeffrey P. McCarthy has served as a director since December 2001. Since December 1998, Mr. McCarthy has served as a general partner of North Bridge Venture Partners, a venture capital firm. Mr. McCarthy holds a B.S. in Business Administration from Northeastern University and an M.B.A. from Bentley University. We believe Mr. McCarthy's qualifications to sit on our board of directors include his business development experience as a partner for a venture capital firm.

We have adopted a written code of business conduct and ethics that applies to our directors, officers and employees, including our principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing similar functions. A current copy of the code is posted on the Corporate Governance section of our website, which is located at www.a123systems.com.

The members of our audit committee are Messrs. Goldstein, Haroian and McCarthy. Mr. Haroian chairs the audit committee. Our board of directors has determined that each audit committee member satisfies (i) the requirements for financial literacy and (ii) the independence standards for audit committee membership under the current requirements of the Nasdaq Marketplace Rules. Mr. Haroian is an "audit committee financial expert," as defined by SEC rules and satisfies the financial sophistication requirements of The NASDAQ Global Select Market. Our audit committee assists our board of directors in its oversight of our accounting and financial reporting process and the audits of our financial statements.

Section 16(a) of the Securities Exchange Act of 1934 requires our directors, executive officers and the holders of more than 10% of our common stock to file with the SEC initial reports of ownership of our common stock and other equity securities on a Form 3 and reports of changes in such ownership on a Form 4 or Form 5. Officers, directors and 10% stockholders are required by SEC regulations to furnish us with copies of all Section 16(a) forms they file. To our knowledge, based solely on our review of copies of reports filed by our directors and executive officers pursuant to Section 16(a) or written representations by the persons required to file these reports, we believe that during 2011 all filing requirements of Section 16(a) were satisfied.

The information under "Compensation and Other Information Concerning Directors and Officers" from our definitive proxy statement filed with the Securities and Exchange Commission for our 2012 annual meeting of stockholders is hereby incorporated by reference.

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.

The information under "Security Ownership of Certain Beneficial Owners and Management" and "Securities Authorized for Issuance Under Equity Compensation Plans" from our definitive proxy statement filed with the Securities and Exchange Commission for our 2012 annual meeting of stockholders is incorporated herein by reference.

Item 13. Certain Relationships and Related Transactions, and Director Independence.

The information under "Certain Relationships and Related Transactions" from our definitive proxy statement filed with the Securities and Exchange Commission for our 2011 annual meeting of stockholders is incorporated herein by reference.

Information required by this item pursuant to Item 407(a) of SEC Regulation S-K relating to director independence is contained in our definitive proxy statement filed with the Securities and Exchange Commission for our 2011 annual meeting of stockholders under "Corporate Governance" and is incorporated herein by reference.

The information under "Independent Auditor Fees and Other Matters" from our definitive proxy statement filed with the Securities and Exchange Commission for our 2011 annual meeting of stockholders is incorporated herein by reference.

The following financial statements and supplementary data are included in Part II of Item 8 filed of this Annual Report on Form 10-K:

All financial statement schedules have been omitted because they are not applicable or are not required, or because the information required to be set forth therein is included in the consolidated financial statements or notes thereto.

The exhibits filed as part of this Annual Report on Form 10-K are listed on the exhibit index immediately preceding such exhibits, and is incorporated herein by reference.

Pursuant to the requirements 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.

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

			Incorporated by Reference

Exhibit Number		Exhibit Description	Form		File Number		Date of First Filing		Exhibit Number		Filed Herewithin
	3.1	Restated Certificate of Incorporation of the Registrant, as amended September 29, 2009.		10-K		001-34463		3/11/2011		3.1
	3.2	Second Amended and Restated By-laws of the Registrant.		S-1		333-152871		10/9/2008		3.4
	4.1	Specimen Stock Certificate evidencing the shares of common stock.		S-1		333-152871		8/9/2008		4.1
	10.1	2009 Stock Incentive Plan.		S-1/A		333-152871		8/19/2009		10.5
	10.2	Form of Management Incentive Stock Option Agreement under 2009 Stock Incentive Plan.		S-1/A		333-152871		8/19/2009		10.6
	10.3	Form of Management Nonstatutory Stock Option Agreement under 2009 Stock Incentive Plan.		S-1/A		333-152871		8/19/2009		10.7
	10.4	Lease Agreement, dated September 15, 2008, between Jijun Company and Enerland Co., Ltd.		S-1/A		333-152871		9/9/2009		10.8
	10.5	Lease, dated June 1, 2004, between President and Fellows of Harvard College and the Registrant, as amended by the First Amendment to Lease, dated February 9, 2007.		S-1		333-152871		8/9/2008		10.9
	10.6	Lease Agreements, dated July 30, 2007, between O'Brien Investment Partners, LLC and the Registrant.		S-1		333-152871		8/9/2008		10.10
	10.7	Lease Contract, dated March 2, 2008, between Changzhou Wujin Materials Recovery Co., Ltd. and A123 Systems (China) Co., Ltd.		S-1		333-152871		8/9/2008		10.11
	10.8	Lease Contract, dated December 31, 2008, between Jiangsu Dagang Co., Ltd. and A123 Systems (Zhenjiang) Co., Ltd.		S-1/A		333-152871		9/9/2009		10.12
	10.9	Lease Contract of Workshop, dated March 1, 2009, between Changzhou Hi-Tech District EP2 Investment & Development Co., Ltd. and A123 Systems (China) Materials Co., Ltd.		S-1/A		333-152871		9/9/2009		10.13
	10.10	Lease Agreement, dated February 13, 2009, between Hyundai J. Comm Co., Ltd. and Enerland Co., Ltd.		S-1/A		333-152871		9/9/2009		10.14

			Incorporated by Reference

Exhibit Number		Exhibit Description	Form		File Number		Date of First Filing		Exhibit Number		Filed Herewithin
	10.11	Seventh Amended and Restated Investor Rights Agreement among the Registrant, the Founders and the Purchasers, dated as of April 3, 2009.		S-1/A		333-152871		6/23/2009		10.15
	10.12††	Agreement, dated May 16, 2007, between BAE Systems Controls Inc. and the Registrant.		S-1/A		333-152871		6/23/2009		10.16
	10.13	Warrant to Purchase 45,000 shares of Common Stock, dated February 8, 2008, issued to Skadden, Arps, Slate, Meagher & Flom LLP by the Registrant.		S-1		333-152871		8/9/2008		10.23
	10.14††	Joint Development and Supply Agreement, dated February 6, 2008, between AES Energy Storage, LLC and the Registrant, as amended March 14, 2008 and July 2, 2008.		S-1/A		333-152871		10/31/2008		10.24
	10.15††	Exclusive Patent License Agreement, dated December 4, 2001, between Massachusetts Institute of Technology and the Registrant, as amended by the First Amendment, dated February 1, 2003, and the Second Amendment, dated July 25, 2008.		S-1		333-152871		8/9/2008		10.28
	10.16††	Exclusive License Agreement, dated November 17, 2008, between the Registrant and The Gillette Company.		S-1/A		333-152871		11/25/2008		10.30
	10.17††	Purchase Agreement, dated November 17, 2008, between the Registrant and The Gillette Company.		S-1/A		333-152871		11/25/2008		10.31
	10.18††	Joint Venture Contract dated December 16, 2009 by and between SAIC Motor Co. LTD. and A123 Systems Hong Kong Limited.		8-K		001-34463		12/17/2009		10.1
	10.19	MEGA Tax Credit Agreement dated as of November 20, 2009, by and between the Michigan Economic Growth Authority and the Registrant, a Delaware corporation.		8-K		001-34463		11/25/2009		10.1
	10.20	Lease Agreement, dated December 4, 2009, between Welsh Romulus, LLC, BPE Exchange, LLC, and BPW Exchange, LLC and the Registrant.		10-K		001-34463		3/15/2010		10.25
	10.21	Third Amendment, dated December 28, 2009, to the Lease between President and Fellows of Harvard College and the Registrant, dated June 1, 2004.		10-K		001-34463		3/15/2010		10.26

			Incorporated by Reference

Exhibit Number		Exhibit Description	Form		File Number		Date of First Filing		Exhibit Number		Filed Herewithin
	10.22	Grant and Cooperative Agreement dated December 4, 2009 by and between the U.S. Department of Energy and the Registrant.		10-K		001-34463		3/15/2010		10.27
	10.23	Lease Agreement, dated May 19, 2010, by and between Boston Properties Limited Partnership and the Registrant.		10-Q		001-34463		8/11/2010		10.1
	10.24	Supply Agreement, dated June 23, 2010, by and between ConocoPhillips Specialty Products, Inc. and the Registrant.		10-Q		001-34463		8/11/2010		10.3
	10.25	First Amendment to Lease, dated May 19, 2010, by and between Boston Properties Limited Partnership and the Registrant dated July 23, 2010.		10-Q		001-34463		11/10/2010		10.1
	10.26	Lease Agreement, dated July 16, 2010, by and between 155 Flanders LLC and the Registrant.		10-Q		001-34463		11/10/2010		10.2
	10.27	Supply Agreement, dated January 13, 2010, by and between Fisker Automotive, Inc. and the Registrant.		10-Q		001-34463		11/10/2010		10.3
	10.28	Lease Agreement, dated May 12, 2009, by and between 39000 Associates LLC and the Registrant.		10-K		001-34463		3/11/2011		10.31
	10.29	Credit Agreement, dated September 30, 2011, among the Registrant, the Several Lenders from time to time parties thereto, and Silicon Valley Bank.		10-Q		001-34463		11/9/11		10.34
	10.30	Form of Subscription Agreement.		8-K		001-34463		1/20/12		10.1
	10.31	Form of Warrant.		8-K		001-34463		1/20/12		10.2
	10.32	Form of Executive Restricted Stock Unit Agreement under 2009 Stock Incentive Plan.		—		—		—		—		X
	10.33	Form of Amended and Restated Executive Retention Agreement executed between the Registrant and each of David Prystash, Robert Johnson, Gilbert Neal Riley, Jr., Eric Pyenson, Louis Golato, and Jason Forcier.		—		—		—		—		X
	10.34	Form of Executive Retention Agreement.		—		—		—		—		X

			Incorporated by Reference

Exhibit Number		Exhibit Description	Form		File Number		Date of First Filing		Exhibit Number		Filed Herewithin
	10.35	Amended and Restated Executive Retention Agreement dated as of February 8, 2012 by and between the Registrant and David Vieau.		—		—		—		—		X
	10.36†	Patent Sublicense Agreement, dated October 31, 2011, between the Registrant and LiFePO4+C Licensing SG.		—		—		—		—		X
	10.37†	Technology License Agreement, dated November 3, 2011, between the Registrant and IHI Corporation.		—		—		—		—		X
	10.38†	Stock Purchase Agreement, dated November 3, 2011, between the Registrant and IHI Corporation.		—		—		—		—		X
	10.39	First Amendment to Lease Agreement dated, December 13, 2011, by and between Flanders 155 LLC and the Registrant.		—		—		—		—		X
	21.1	Subsidiaries of the Registrant.		—		—		—		—		X
	23.1	Consent of Deloitte & Touche LLP, Independent Registered Accounting Firm.		—		—		—		—		X
	31.1	Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 by Chief Executive Officer.		—		—		—		—		X
	31.2	Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 by Chief Financial Officer.		—		—		—		—		X
	32.1*	Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, by Chief Executive Officer.		—		—		—		—		X
	32.2*	Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, by Chief Financial Officer.		—		—		—		—		X
	101.INS+	XBRL Instance Document		—		—		—		—		X
	101.SCH+	XBRL Taxonomy Extension Schema Document		—		—		—		—		X
	101.CAL+	XBRL Taxonomy Extension Calculation Linkbase Document		—		—		—		—		X


(Mark One)
ý		ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the fiscal year ended December 31, 2011
OR
o		TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the transition period from to


Delaware (State or other jurisdiction of incorporation or organization)		04-3583876 (I.R.S. Employer Identification No.)
A123 Systems, Inc. 200 West Street Waltham, Massachusetts (Address of principal executive offices)		02451 (Zip Code)

Title of each class		Name of each exchange on which registered

Common Stock, Par Value $0.001		NASDAQ Global Select Market


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


EX-31.1 CEO Certification pursuant to Section 302 of the Sarbanes-Oxley Act
EX-31.2 CFO Certification pursuant to Section 302 of the Sarbanes-Oxley Act
EX-32.1 CEO Certification pursuant to Section 906 of the Sarbanes-Oxley Act
EX-32.2 CFO Certification pursuant to Section 906 of the Sarbanes-Oxley Act
EX-101.INS—XBRL Instance Document
EX-101.SCH—XBRL Taxonomy Extension Schema Document
EX-101.CAL—XBRL Taxonomy Extension Calculation Linkbase Document
EX-101.LAB—XBRL Taxonomy Extension Label Linkbase Document
EX-101.PRE—XBRL Taxonomy Extension Presentation Linkbase Document
EX-101.DEF—XTRL Taxonomy Extension Definition




Cell Product Model Number	ANR26650		APR18650	AHR32113	AMP20
Nominal capacity* (Ah)		2.3 Ah	1.1 Ah	4.4 Ah	20 Ah
Energy (Wh)		7.6 Wh	3.6 Wh	14.6 Wh	64 Wh
Power to energy ratio		High	Medium	Ultra High	Medium
Electrode type**		M1	M1	M1 Ultra	M1 HD
Status		Volume production	Volume production	Volume production	Volume production
Applications		Consumer and Professional, Hybrid Transit Buses, Electric Vehicles, Electric Grid Services	Consumer and Professional Applications	Hybrid Electric Vehicles, Hybrid Transit Buses and Heavy Duty Hybrid Electric Vehicles	Extended Range Electric Vehicles, Plug-In Hybrid and Electric Vehicles

Quarter Ended	March 31,		June 30,		September 30,		December 31,		Fiscal Year

2011
High	$	10.99	$	6.39	$	5.91	$	4.44	$	10.99
Low	$	6.27	$	4.49	$	2.99	$	1.51	$	1.51
2010
High	$	22.80	$	14.61	$	11.00	$	10.19	$	22.80
Low	$	13.64	$	7.59	$	6.54	$	7.70	$	6.54



A123 Systems, Inc.	100	110.6	47.02	7.93
NASDAQ Composite	100	113.11	132.97	131.72
Dow Jones US Electrical Components & Equipment TSM	100	116.9	146.34	127.60

	Year Ended December 31,

	2010		2011		$ Change			% Change
Revenue	(Dollars in thousands)
Product
Transportation	$	43,673	$	84,248	$	40,575			92.9	%
Commercial		16,596		15,277		(1,319	)		-7.9	%
Electric grid		13,557		39,555		25,998			191.8	%

Total product		73,826		139,080		65,254			88.4	%
Services		23,486		20,067		(3,419	)		-14.6	%

Total revenue	$	97,312	$	159,147	$	61,835			63.5	%

Lender		Type of Facility	Interest Rate (per annum)	Principal Amount			Maturity Date

				(In Thousands)
Various (U.S. Bank National Association, Trustee)	Apr-11	Convertible Note	3.75%		143,750	140,064	Apr-16
Silicon Valley Bank	Sep-08	Term Loan	Prime +0.75%		7,500	416	Jan-12
Silicon Valley Bank	Apr-09	Term Loan	Prime +0.75%		2,500	486	Jul-12
Silicon Valley Bank	May-09	Term Loan	Prime +0.75%		3,000	667	Aug-12
Silicon Valley Bank	Jun-09	Term Loan	Prime +0.75%		1,000	250	Sep-12
Silicon Valley Bank	Aug-09	Term Loan	Prime +0.75%		1,000	250	Aug-12
Silicon Valley Bank	Sep-11	Revolving Line of Credit	LIBOR +2.25%		38,094	38,094	Sep-14
Massachusetts Clean Energy Technology Center*	Oct-10	Forgivable Loan	6%		5,000	2,691	Oct-17

			Payments Due in

	Total		Less than 1 Year		1-3 Years		3-5 Years		More than 5 Years
			(in thousands)
Long-term debt, including current portion	$	144,824	$	2,069	$	—	$	140,064	$	2,691
Interest related to debt payments		25,701		5,423		10,782		6,963		2,533
Capital lease obligations		28,144		3,396		5,792		5,885		13,071
Operating lease obligations		24,463		3,482		6,546		6,325		8,110
Purchase obligations⁽¹⁾		66,852		48,352		18,500		—		—

	$	289,984	$	62,722	$	41,620	$	159,237	$	26,405

		Page Number

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM			92
Financial Statements:
Consolidated Balance Sheets			93
Consolidated Statements of Operations			94
Consolidated Statements of Stockholders' (Deficit) Equity			95
Consolidated Statements of Cash Flows			96
Notes to Consolidated Financial Statements			97

	December 31, 2009		December 31, 2010		December 31, 2011

Beginning balance	$	1,486	$	1,661	$	1,915
Provision		13		228		868
Write-offs and adjustments		162		26		(1,693	)

Ending balance	$	1,661	$	1,915	$	1,090

	December 31, 2010		December 31, 2011

Property, plant and equipment (based on location
of asset)
United States	$	72,778	$	72,539
China		61,830		65,948
Korea		9,390		6,716

	$	143,998	$	145,203

	Year Ended December 31,

Production start-up expenditures	2009		2010			2011
Aggregated production start-up expenditures	$	1,524	$	26,685		$	13,810
Production start-up reimbursements		—		(5,621	)		(4,589	)

Production start-up expenses	$	1,524	$	21,064		$	9,221

			As of December 31, 2010

	Fair Value at December 31, 2010		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Asset:
Money market funds	$	174,603	$	174,603	$	—	$	—
U.S. Treasury and government agency securities		17,333		—		17,333

			As of December 31, 2011

	Fair Value at December 31, 2011		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Money market funds	$	160,944	$	160,944	$	—	$	—



Convertible debt upon conversion to common stock	—	—	19,965
Warrants to purchase common stock	45	45	45
Options to purchase common stock	10,640	10,783	11,967
Unvested restricted stock units	—	203	5,366

	10,685	11,031	37,343

	December 31, 2010		December 31, 2011

Raw materials	$	18,929	$	44,493
Work-in-process		27,226		53,924
Finished goods		1,610		4,977

	$	47,765	$	103,394

	December 31, 2010		December 31, 2011

Computer equipment and software	$	11,913	$	23,331
Furniture and fixtures		3,415		5,640
Automobiles		404		536
Machinery and equipment		122,187		263,754
Buildings		26,810		25,844
Leasehold improvements		34,540		90,485
Property, plant and equipment not in service		154,357		15,805

Property, plant and equipment, basis		353,626		425,395
Less reduction for costs reimbursed under government grants		164,999		223,884

Property, plant and equipment, carrying value		188,627		201,511

Less accumulated depreciation, net		44,629		56,308

Property, plant and equipment, net	$	143,998	$	145,203

	December 31, 2010			December 31, 2011

Computer equipment and software, at cost	$	2,758			2,910
Buildings, at cost		16,446		$	16,446
Leasehold improvements, at cost		2,091			2,091
Accumulated depreciation		(1,631	)		(4,199	)

Property, plant and equipment under capital lease, net	$	19,664		$	17,248

		December 31, 2010						December 31, 2011

Intangible Asset Class	Useful Life (Years)	Gross		Accumulated Amortization		Net		Gross		Accumulated Amortization		Net
Contractual backlogs	1-3	$	497	$	497	$	—	$	—	$	—	$	—
Customer relationships	5-17		647		428		219		451		451		—
Patented technology	4-5		2,526		2,333		193		2,526		2,526		—
Specialty-trained workforce	4		60		59		1		60		60		—

		$	3,730	$	3,317	$	413	$	3,037	$	3,037	$	—

	December 31, 2010		December 31, 2011

Capital expenditures	$	30,618	$	4,169
Payroll and related benefits		7,263		9,635
Legal, audit, tax and professional fees		3,138		2,079
Product warranty, current		2,988		9,275
Taxes		1,052		881
Other		3,120		5,871

Total accrued expenses	$	48,179	$	31,910

Years Ending December 31,	Capital Lease Obligations

2012	$	3,396
2013		2,944
2014		2,848
2015		2,840
2016		3,045
Thereafter		13,071

		28,144
Less portion representing interest		9,068

Present value of future minimum payments		19,076
Less current portion		1,740

Long-term obligations	$	17,336

	December 31, 2010			December 31, 2011

Product warranty liability—beginning of period	$	3,341		$	4,501
Accruals for new warranties issued (warranty expense)		1,924			10,629
Accruals for preexisting warranties (warranty expense)		—			6,148
Payments made (in cash or in kind)		(764	)		(3,751	)

Product warranty liability—end of period		4,501			17,527

Less amounts classified as current		2,988			9,275

Long-term warranty liability	$	1,513		$	8,252

	December 31, 2010			December 31, 2011

Net operating losses	$	101,872		$	179,245
Accruals, reversals and stock compensation		17,304			21,422
Deferred revenue		10,688			11,872
Credit carryforwards		3,899			4,051
Depreciation and amortization		2,714			4,169

Deferred tax assets before valuation allowance		136,477			220,759
Valuation allowance		(136,243	)		(220,759	)

Net deferred tax assets	$	234		$	—

	December 31, 2010		December 31, 2011

Convertible notes	$	—	$	140,064
Term loan		7,069		2,069
Mass Clean Energy loan		2,534		2,691
Korean subsidiary debt
Technology funds loan		44		—
Korean government loans		335		—

Total		9,982		144,824
Less amounts classified as current		5,379		2,069

Long-term debt	$	4,603	$	142,755

	Shares			Weighted Average Exercise Price			Aggregate Intrinsic Value

	(In thousands)						(In thousands)
Outstanding—January 1, 2011		10,783		$	7.64	7.41	$	27,743

Granted		3,371			4.93
Exercised		(658	)		3.05
Forfeited		(1,529	)		9.45

Outstanding—December 31, 2011		11,967		$	6.90	7.33	$	1,434

Vested or expected to vest—December 31, 2011		11,382		$	6.93	7.23	$	1,429
Options exercisable—December 31, 2011		6,278		$	6.75	5.90	$	1,406

	Shares			Weighted Average Fair Value

	(In thousands)
Non-vested—January 1, 2011		203		$	10.13
Granted		5,333			2.51
Vested		(69	)		10.03
Forfeited		(101	)		6.73

Non-vested—December 31, 2011		5,366		$	2.62


Report of Independent Registered Public Accounting Firm
Consolidated Balance Sheets—December 31, 2010 and 2011
Consolidated Statements of Operations—For the years ended December 31, 2009, 2010 and 2011
Consolidated Statements of Stockholders' (Deficit) Equity—For the years ended December 31, 2009, 2010 and 2011
Consolidated Statements of Cash Flows—For the years ended December 31, 2009, 2010 and 2011
Notes to Consolidated Financial Statements


	A123 SYSTEMS, INC.
Date: March 12, 2012	By:	/s/ DAVID P. VIEAU David P. Vieau Chief Executive Officer (Principal Executive Officer)

Signature	Title	Date


/s/ DAVID P. VIEAU David P. Vieau	Chief Executive Officer and Director (principal executive officer)	March 12, 2012
/s/ DAVID PRYSTASH David Prystash	Chief Financial Officer (principal financial officer)	March 12, 2012
/s/ RICHARD E. JOHNSON Richard E. Johnson	Chief Accounting Officer (principal accounting officer)	March 12, 2012
/s/ GURURAJ DESHPANDE Gururaj Deshpande	Director	March 12, 2012
/s/ ARTHUR L. GOLDSTEIN Arthur L. Goldstein	Director	March 12, 2012
/s/ GARY E. HAROIAN Gary E. Haroian	Director	March 12, 2012
/s/ PAUL E. JACOBS Paul E. Jacobs	Director	March 12, 2012
/s/ MARK M. LITTLE Mark M. Little	Director	March 12, 2012

Signature	Title	Date


/s/ JEFFREY P. MCCARTHY Jeffrey P. McCarthy	Director	March 12, 2012
/s/ GILBERT NEAL RILEY, JR. Gilbert Neal Riley, Jr.	Director	March 12, 2012