FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * Zuidema Richard W   2. Issuer Name and Ticker or Trading Symbol EnerSys [ENS] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) EVP Administration & Secretary (Last) (First) (Middle) 2366 BERNVILLE ROAD 3. Date of Earliest Transaction (Month/Day/Year) 05/17/2010 (Street) READING, PA 19605 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock (1) 05/17/2010   A   13,062 A $ 0 87,096 D   Common Stock (2) 05/17/2010   A   5,843 A $ 0 92,939 D   Common Stock 05/18/2010   F   1,378 D $ 25.67 91,561 D

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

3.375% Convertible Senior Notes Due 2038

(3)

05/17/2010

S

$ 300,000

03/01/2015(4)

05/31/2038

Common Stock

7,389

$ 292,753.1

0

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Zuidema Richard W 2366 BERNVILLE ROAD READING, PA 19605			EVP Administration & Secretary

Signatures

Karen J. Yodis, by Power of Attorney		05/19/2010
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	These shares were granted as market share units and vest one hundred percent on May 17, 2013, subject to acceleration and cancellation upon the occurrence of certain events.
(2)	These shares were granted as restricted stock units and vest twenty five percent on each of May 17, 2011, May 17, 2012, May 17, 2013, and May 17, 2014, subject to acceleration or cancellation upon the occurrence of certain events.
(3)	The 3.375% Convertible Senior Notes Due 2038 (the "Notes") are convertible into shares of common stock, par value of $001 per share, at an initial conversion price of $40.60 per share, subject to adjustment under certain circumstances.
(4)	Only under certain circumstances may the reporting person convert the Notes prior to March 1, 2015.

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