Thanks To Siri, The iPhone 4S Is A Serious Upgrade [CultofMac's Big Fat Mega Review] | Cult of Mac
iPhone 4S Battery vs. iPhone 4 - YouTube
iPhone 4S Battery Life Worse for 3G Data and Media as Compared to iPhone 4 - MacRumors
Is the iPhone 4S's battery actually better than the iPhone 4's despite having less standby time? - Quora
iPhone 4S Battery Life (Real-World Tests): EveryiPhone.com
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iPhone Battery Buying? iPhone 4S Battery Cheap With Us Available! | Stuff Enough
Notes From iFixit's iPhone 4S Teardown: 512 MB of RAM, New 3G Chip - MacStories
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Key Differences Between the iPhone 4S and 'iPhone 5' Battery? [Photos] - iClarified
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Stuck in iPhone 4S battery hell? Here's a way out | BetaNews