EnerSys — Director's Dealing 2010

May 19, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: EnerSys (ENS)
CIK: 0001289308
Period of Report: 2010-05-17

Reporting Person: Craig John D (Director, Chairman, President & CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-05-17	Common Stock	A	58781	—	Acquired	427652	Direct
2010-05-17	Common Stock	A	26295	—	Acquired	453947	Direct
2010-05-17	Common Stock	M	72206	$10.82	Acquired	526153	Direct
2010-05-17	Common Stock	S	72206	$25.61	Disposed	453947	Direct
2010-05-18	Common Stock	M	27794	$10.82	Acquired	481741	Direct
2010-05-18	Common Stock	S	27794	$26.01	Disposed	453947	Direct
2010-05-18	Common Stock	F	6583	$25.67	Disposed	447364	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-05-17	Stock Options	$10.82	M	72206	Disposed	2012-03-22	Common Stock (72206)	Direct
2010-05-17	3.375% Convertible Senior Notes Due 2038	$	S		Disposed	2038-05-31	Common Stock (24630)	Direct
2010-05-18	Stock Options	$10.82	M	27794	Disposed	2012-03-22	Common Stock (27794)	Direct

Footnotes

F1: 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.

F2: 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.

F3: These transactions were executed in multiple trades at prices ranging from $25.50 through $25.74. The price reported reflects the weighted average sale price. Full information regarding the number of shares sold and the prices at which the transactions were effected is available to the SEC staff, the issuer or any security holder of the issuer, upon request.

F4: These transactions were executed in multiple trades at prices ranging from $25.9100 through $26.2560. The price reported reflects the weighted average sale price. Full information regarding the number of shares sold and the prices at which the transactions were effected is available to the SEC staff, the issuer or any security holder of the issuer, upon request.

F5: This amount excludes shares owned by the reporting person's adult son. The reporting person disclaims ownership of his adult son's shares in their entirety.

F6: The options vested twenty five percent on March 22, 2003 and March 22, 2004; thirty percent on July 29, 2004; and twenty percent on March 22, 2005.

F7: 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.

F8: Only under certain circumstances may the reporting person convert the Notes prior to March 1, 2015.

F9: The reporting person holds an aggregate total of 701,992 option shares with various prices, excercisability and expiration dates.