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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
 TrWZ/RLJRzDem83TCrTapZs7eB3/RKfbNnoJNxZpd7rKwMLc3IMHt9CKXJkDIRKV
 YBCZbeMz8rbsDK67mdmJzw==

<SEC-DOCUMENT>0001181431-05-051639.txt : 20050913
<SEC-HEADER>0001181431-05-051639.hdr.sgml : 20050913
<ACCEPTANCE-DATETIME>20050913192525
ACCESSION NUMBER:		0001181431-05-051639
CONFORMED SUBMISSION TYPE:	4/A
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20050908
FILED AS OF DATE:		20050913
DATE AS OF CHANGE:		20050913

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MAXWELL TECHNOLOGIES INC
		CENTRAL INDEX KEY:			0000319815
		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRONIC COMPUTERS [3571]
		IRS NUMBER:				952390133
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		8888 BALBOA AVENUE
		CITY:			SAN DIEGO
		STATE:			CA
		ZIP:			92123
		BUSINESS PHONE:		8582795100

	MAIL ADDRESS:	
		STREET 1:		8888 BALBOA AVENUE
		CITY:			SAN DIEGO
		STATE:			CA
		ZIP:			92123

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MAXWELL LABORATORIES INC /DE/
		DATE OF NAME CHANGE:	19920703

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			MONTENA SA
		CENTRAL INDEX KEY:			0001177386

	FILING VALUES:
		FORM TYPE:		4/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-15477
		FILM NUMBER:		051083236

	BUSINESS ADDRESS:	
		STREET 1:		CH. DELA CORNACKE 1
		CITY:			MATRAN
		STATE:			V8
		ZIP:			1753
		BUSINESS PHONE:		01141223105858

	MAIL ADDRESS:	
		STREET 1:		CH. DELA CURNACKE 1
		CITY:			MATRAN
		STATE:			V8
		ZIP:			1753
</SEC-HEADER>
<DOCUMENT>
<TYPE>4/A
<SEQUENCE>1
<FILENAME>rrd91810.xml
<DESCRIPTION>FORM 4A_ MONTENA
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2005-09-08</periodOfReport>

    <dateOfOriginalSubmission>2005-09-09</dateOfOriginalSubmission>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000319815</issuerCik>
        <issuerName>MAXWELL TECHNOLOGIES INC</issuerName>
        <issuerTradingSymbol>MXWL</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001177386</rptOwnerCik>
            <rptOwnerName>MONTENA SA</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>CH. DE LA CORNACHE 1</rptOwnerStreet1>
            <rptOwnerStreet2>CH-1753 MATRAN</rptOwnerStreet2>
            <rptOwnerCity>MATRAN, SWITZERLAND</rptOwnerCity>
            <rptOwnerState></rptOwnerState>
            <rptOwnerZipCode></rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Sale of common stock</value>
            </securityTitle>
            <transactionDate>
                <value>2005-09-08</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>18557</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>13.9873</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2552000</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">On September 7, 2005, the reporting person mistakenly filed a Form 4 reporting a sale of 557 shares of common stock that did not in fact occur. As of September 8, 2005 the amount of securities beneficially owned were 2,552,000.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Martin Schutt</signatureName>
        <signatureDate>2005-09-13</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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