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iPhone 4 Battery Replacement Service
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Amazon.com: Sol Hybrid USB Powered Solar Panel Power Pack for iPhone 4/4S - Increase Your iPhone's Battery Life by 300% or More! : Electronics
Testing the iPhone 4S' battery life - CNET
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Incredible Battery Life - Apple's iPhone 4: Thoroughly Reviewed
iPhone 4 Battery Life (Real-World Tests): EveryiPhone.com
