iPhone 4 Battery Replacement - iFixit Repair Guide
Apple's iPhone 4: Thinner, better battery life, HD video - PC World New Zealand
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iPhone 4S Battery vs. iPhone 4 - YouTube
Apple iPhone 4: Battery life and connectivity - iPhone 4 review | TechRadar
iPhone 4S Battery Replacement - iFixit Repair Guide
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OEM Apple iPhone 4S Battery - ETrade Supply
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Is the iPhone 4S's battery actually better than the iPhone 4's despite having less standby time? - Quora
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Apple iPhone 4s - Full phone specifications
How to Replace iPhone 4 and iPhone 4S Battery: EveryiPhone.com
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iPhone 4 Tips - Battery Saving Secrets - YouTube
iPhone 4 Battery Life (Real-World Tests): EveryiPhone.com
Is it safe to install a third party high capacity battery into my iPhone 5S? - Ask Different
Apple iPhone 4 - Full phone specifications
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How To: Replace the Battery on your iPhone 4s! - YouTube
Samsung S4 retains best battery-life title in rigorous consumer association tests - 9to5Google
iPhone Battery Sizes (mAh) – iPhone 3GS to iPhone 13
