ENERSYS LETTERHEAD]

EXHIBIT 10.4

[ENERSYS LETTERHEAD]

XXXX X. XXXXX
Chairman, President & CEO

June 19, 2006

Xx. Xxxx X. Xxxx

Dear Xxxx:

With reference to your employment agreement (the "Employment Agreement") with EnerSys Delaware Inc., f/k/a Yuasa, Inc., (the "Company"), dated November 9, 2000, pursuant to which you are currently employed as Executive Vice President Americas of the Company, we confirm that your salary as set forth in Section 3 of the Employment Agreement is increased to $352,000.00, effective as of April 1, 2006.

Except as expressly set forth in the letter, the Employment Agreement shall remain in full force and effect.

ENERSYS DELAWARE INC.

By: /s/ Xxxx X. Xxxxx

Xxxx X. Xxxxx
Chairman, President & Chief Executive Officer

JDC:jls