UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of

the Securities Exchange Act of 1934

Filed by the Registrant x

Filed by a Party other than the Registrant ¨

Check the appropriate box:

¨ Preliminary Proxy Statement

¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

¨ Definitive Proxy Statement

x Definitive Additional Materials

¨ Soliciting Material Pursuant to §240.14a-12

Maxwell Technologies, Inc.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

x No fee required.

¨ Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.

(1) Title of each class of securities to which transaction applies:

(2) Aggregate number of securities to which transaction applies:

(3) Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):

(4) Proposed maximum aggregate value of transaction:

(5) Total fee paid:

¨ Fee paid previously with preliminary materials.

¨ Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.

(1) Amount Previously Paid:

(2) Form, Schedule or Registration Statement No.:

(3) Filing Party:

(4) Date Filed:

*** Exercise Your Right to Vote ***

IMPORTANT NOTICE Regarding the Availability of Proxy Materials

		Meeting Information
		Meeting Type:		Annual Meeting
	MAXWELL TECHNOLOGIES, INC.	For holders as of:		March 20, 2009
		Date:    May 20, 2009    Time:    11:00 AM PDT
		Location:	Hilton San Diego
			Mission Valley
			901 Camino Del Rio South
			San Diego, California 92108
	MAXWELL TECHNOLOGIES, INC.         Daniel Reineck         9244 BALBOA AVENUE,         SAN DIEGO, CA    92123	You are receiving this communication because you hold shares in the above named company. This is not a ballot. You cannot use this notice to vote these shares. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. You may view the proxy materials online at www.proxyvote.com or easily request a paper copy (see reverse side). We encourage you to access and review all of the important information contained in the proxy materials before voting. See the reverse side of this notice to obtain proxy materials and voting instructions.

— Before You Vote —

How to Access the Proxy Materials

	Proxy Materials Available to VIEW or RECEIVE: 1. Form 10-K        2. Notice & Proxy Statement How to View Online: Have the 12-Digit Control Number available (located on the following page) and visit: www.proxyvote.com. How to Request and Receive a PAPER or E-MAIL Copy: If you want to receive a paper or e-mail copy of these documents, you must request one. There is NO charge for requesting a copy. Please choose one of the following methods to make your request:
		1) BY INTERNET:	www.proxyvote.com
		2) BY TELEPHONE:	1-800-579-1639
		3) BY E-MAIL*:	sendmaterial@proxyvote.com
	*  If requesting materials by e-mail, please send a blank e-mail with the 12-Digit Control Number (located on the following page) in the subject line. Requests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investment advisor. Please make the request as instructed above on or before May 06, 2009 to facilitate timely delivery.
— How To Vote — Please Choose One of The Following Voting Methods
	Vote In Person: Many shareholder meetings have attendance requirements including, but not limited to, the possession of an attendance ticket issued by the entity holding the meeting. Please check the meeting materials for any special requirements for meeting attendance. At the Meeting you will need to request a ballot to vote these shares.
	Vote By Internet: To vote now by Internet, go to www.proxyvote.com. Have the 12-Digit Control Number available and follow the instructions.
	Vote By Mail: You can vote by mail by requesting a paper copy of the materials, which will include a proxy card.

Voting items

The Board of Directors recommends that you vote FOR the following:

1.      Election of Directors

Nominees
01     Jose L. Cortes	02     Edward Caudill	03     Roger Howsmon
The Board of Directors recommends you vote FOR the following proposal(s):
2       Approve an amendment to the Restated Certificate of Incorporation to authorize 5,000,000 shares of preferred stock which the Board of Directors may authorize to be issued from time to time in one or more series, with such rights, preferences and restrictions as are fixed by the Board of Directors.
3       Ratification of the appointment of McGladrey & Pullen, LLP as our independent public accountants for the fiscal year ending December 31, 2009
NOTE:  Such other business as may properly come before the meeting or any adjournment thereof.