Exolife Rechargeable Battery Case for iPhone 4

by Exogear

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Elite Battery + Case for iPhone 4 and iPhone 4S

by Phonesuit

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OffGrid Backup Battery Case for iPhone 4/4S

by Incipio

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Quattro4 Glass Screen Touch-Thru Case for iPhone 4 & SmartCase 4 Battery Pack

by IvySkin

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