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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 JXmCm6ofdI98HxWcsjEZGnT38JZ7VHP2TqzeFP3w3BfvRSGz7JF8Ib4gh4LQFQwB
 7S/L3xuPFv8MWzMXBqmCZw==

<SEC-DOCUMENT>0001181431-09-013623.txt : 20090304
<SEC-HEADER>0001181431-09-013623.hdr.sgml : 20090304
<ACCEPTANCE-DATETIME>20090304163414
ACCESSION NUMBER:		0001181431-09-013623
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20090303
FILED AS OF DATE:		20090304
DATE AS OF CHANGE:		20090304

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Shea John A
		CENTRAL INDEX KEY:			0001298260

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-32253
		FILM NUMBER:		09655881

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		610-208-1991

	MAIL ADDRESS:	
		STREET 1:		2366 BRENVILLE ROAD
		CITY:			READING
		STATE:			PA
		ZIP:			19605

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			EnerSys
		CENTRAL INDEX KEY:			0001289308
		STANDARD INDUSTRIAL CLASSIFICATION:	WHOLESALE-ELECTRICAL APPARATUS & EQUIPMENT, WIRING SUPPLIES [5063]
		IRS NUMBER:				233058564
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0331

	BUSINESS ADDRESS:	
		STREET 1:		2366 BERNVILLE ROAD
		CITY:			READING
		STATE:			PA
		ZIP:			19605
		BUSINESS PHONE:		(610) 208-1600

	MAIL ADDRESS:	
		STREET 1:		2366 BERNVILLE ROAD
		CITY:			READING
		STATE:			PA
		ZIP:			19605
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>rrd236252.xml
<DESCRIPTION>SHEA - CONVERTIBLE NOTES
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2009-03-03</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001289308</issuerCik>
        <issuerName>EnerSys</issuerName>
        <issuerTradingSymbol>ENS</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001298260</rptOwnerCik>
            <rptOwnerName>Shea John A</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2366 BERNVILLE ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>READING</rptOwnerCity>
            <rptOwnerState>PA</rptOwnerState>
            <rptOwnerZipCode>19605</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Executive VP, Americas</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>3.375% Convertible Senior Notes due 2038</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2009-03-03</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F2"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionTotalValue>
                    <value>100000</value>
                </transactionTotalValue>
                <transactionPricePerShare>
                    <value>61890.63</value>
                    <footnoteId id="F5"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2015-03-01</value>
                <footnoteId id="F3"/>
            </exerciseDate>
            <expirationDate>
                <value>2038-05-31</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>2463</value>
                    <footnoteId id="F4"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <valueOwnedFollowingTransaction>
                    <value>100000</value>
                </valueOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The 3.375% Convertible Senior Notes due 2038 (the ?Notes?) are convertible into shares of common stock, par value of $0.01 per share, at an initial conversion price of $40.60 per share, subject to adjustment under certain circumstances.</footnote>
        <footnote id="F2">The purchases reported in this Form 4 were effectuated pursuant to a 10b5-1 trading plan adopted by the reporting person on March 2, 2009.</footnote>
        <footnote id="F3">Only under certain circumstances may the reporting person convert the Notes prior to March 1, 2015.</footnote>
        <footnote id="F4">Subject to adjustment.  The issuer presently intends to settle the Notes in cash.</footnote>
        <footnote id="F5">Includes prorated portion of accrued interest payable since December 1, 2008.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Karen J. Yodis, by Power of Attorney</signatureName>
        <signatureDate>2009-03-04</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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