<?xml version="1.0"?><ownershipDocument><schemaVersion>X0101</schemaVersion>    <documentType>4</documentType><periodOfReport>2003-06-06</periodOfReport><notSubjectToSection16>0</notSubjectToSection16><issuer><issuerCik>0001075656</issuerCik><issuerName>MOBILITY ELECTRONICS INC</issuerName>        <issuerTradingSymbol>MOBE</issuerTradingSymbol></issuer><reportingOwner><reportingOwnerId><rptOwnerCik>0001245484</rptOwnerCik><rptOwnerName>BRUBACHER JOAN W</rptOwnerName></reportingOwnerId><reportingOwnerAddress><rptOwnerStreet1>  </rptOwnerStreet1><rptOwnerStreet2>  </rptOwnerStreet2><rptOwnerCity>  </rptOwnerCity><rptOwnerState>  </rptOwnerState><rptOwnerZipCode>  </rptOwnerZipCode></reportingOwnerAddress><reportingOwnerRelationship><isDirector>0</isDirector><isOfficer>1</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther><officerTitle>Chief Financial Officer</officerTitle></reportingOwnerRelationship></reportingOwner><nonDerivativeSecurity><securityTitle><value>Common Stock</value></securityTitle><transactionDate><value>2003-06-06</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>C</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionTimeliness><value></value></transactionTimeliness><transactionAmounts><transactionShares><value>11764</value><footnoteId id="F1" /></transactionShares><transactionValue><value>0.85</value></transactionValue><transactionAcquiredDisposedCode><value>A</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>61764</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></nonDerivativeSecurity><derivativeSecurity><securityTitle><value>Series F Preferred Stock</value></securityTitle><conversionOrExercisePrice><value>0</value><footnoteId id="F3" /></conversionOrExercisePrice><transactionDate><value>2003-06-06</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>C</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionTimeliness><value></value></transactionTimeliness><transactionAmounts><transactionShares><value>11764</value><footnoteId id="F2" /></transactionShares><transactionValue><value>0.85</value></transactionValue><transactionAcquiredDisposedCode><value>D</value></transactionAcquiredDisposedCode></transactionAmounts><exerciseDate><value>2003-06-06</value></exerciseDate><expirationDate><value>1988-08-08</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>11764</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>0</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></derivativeSecurity><footnotes><footnote id="F1">The reporting person received 11,764 shares of common stock following the automatic conversion of preferred stock in accordance with the stock designation of the Series "F" Preferred Stock acquired January 17, 2003.</footnote><footnote id="F2">The reporting person disposed of 11,764 shares of preferred stock following the automatic conversion to common stock in accordance with the stock designation of the Series "F" Preferred Stock acquired January 17, 2003.</footnote><footnote id="F3">The conversion rate for the Series "F" Preferred Stock is 1-for-1.</footnote></footnotes><ownerSignature><signatureName>Betsy A. Eberg for Joan W. Brubacher</signatureName><signatureDate>2003-07-25</signatureDate></ownerSignature></ownershipDocument>

