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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(Print or Type Responses)

1. Name and Address of Reporting Person * MSDW CAPITAL PARTNERS IV INC   2. Issuer Name and Ticker or Trading Symbol EnerSys [ENS] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 1585 BROADWAY 3. Date of Earliest Transaction (Month/Day/Year) 12/12/2006 (Street) NEW YORK, NY 10036 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) ___ Form filed by One Reporting Person _X_ 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, par value $0.01 per share 12/12/2006   S   4,637,562 D $ 16.02 20,993,135 I (1) Through partnerships (2)

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

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
MSDW CAPITAL PARTNERS IV INC 1585 BROADWAY NEW YORK, NY 10036		X
MSDW IV 892 INVESTORS L P 1585 BROADWAY NEW YORK, NY 10036		X
MSDW CAPITAL PARTNERS IV LLC 1585 BROADWAY NEW YORK, NY 10036		X
MSDW Capital Partners IV, L P 1585 BROADWAY NEW YORK, NY 10036		X
MORGAN STANLEY DEAN WITTER CAPITAL INVESTORS IV L P 1585 BROADWAY NEW YORK, NY 10036		X

Signatures

/s/ Kenneth F. Clifford, Managing Director, Metalmark Subadvisor LLC, as attorney-in-fact for MSDW Capital Partners IV, Inc.		12/14/2006
**Signature of Reporting Person		Date
/s/ Kenneth F. Clifford, Managing Director, Metalmark Subadvisor LLC, as attorney-in-fact for MSDW Capital Partners IV, Inc., as member of MSDW Capital Partners IV, LLC, as general partner of MSDW IV 892 Investors, L.P.		12/14/2006
**Signature of Reporting Person		Date
/s/ Kenneth F. Clifford, Managing Director, Metalmark Subadvisor LLC, as attorney-in-fact for MSDW Capital Partners IV, Inc., as member of MSDW Capital Partners IV, LLC		12/14/2006
**Signature of Reporting Person		Date
/s/ Kenneth F. Clifford, Managing Director, Metalmark Subadvisor LLC, as-attorney-in fact for MSDW Capital Partners IV, Inc., as member of MSDW Capital Partners IV, LLC, as general partner of Morgan Stanley Dean Witter Capital Partners IV, L.P.		12/14/2006
**Signature of Reporting Person		Date
/s/ Kenneth F. Clifford, Managing Director, Metalmark Subadvisor LLC, as attorney-in-fact for MSDW Capital Partners IV, Inc., as member of MSDW Capital Partners IV, LLC, as general partner of Morgan Stanley Dean Witter Capital Investors IV, L.P.		12/14/2006
**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)	Except for Morgan Stanley Dean Witter Capital Partners IV, L.P., MSDW IV 892 Investors, L.P., and Morgan Stanley Dean Witter Capital Investors IV, L.P., which hold the common stock directly. Includes 18,869,605 shares held directly by Morgan Stanley Dean Witter Capital Partners IV, L.P., 1,607,833 shares held directly by MSDW IV 892 Investors, L.P., and 515,697 shares held directly by Morgan Stanley Dean Witter Capital Investors IV, L.P. MSDW Capital Partners IV, LLC is the general partner of such funds. MSDW Capital Partners IV, Inc. is the member of the general partner.
(2)	MSDW Capital Partners IV, Inc. and MSDW Capital Partners IV, LLC have no direct pecuniary interest in securities in Table I(5). Such persons may be deemed to beneficially own an indirect pecuniary interest in securities in Table I(5). Such persons disclaim beneficial ownership therein except to the extent ultimately realized.

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