HOW TO tell the difference between iPhone 4 and 4S - YouTube
Is the iPhone 4S's battery actually better than the iPhone 4's despite having less standby time? - Quora
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Apple curiosities, and iPhone 4S battery tips
Apple iPhone 4S review: Apple iPhone 4S - CNET
Comparing the iPhone 4S vs iPhone 4 vs iPhone 3Gs vs Galaxy S II | OSXDaily
Thanks To Siri, The iPhone 4S Is A Serious Upgrade [CultofMac's Big Fat Mega Review] | Cult of Mac
iPhone Battery Buying? iPhone 4S Battery Cheap With Us Available! | Stuff Enough
Used iPhone 4 vs 4s: Which should you buy? | iMore
iPhone 5 vs. iPhone 4S vs. iPhone 4
Stuck in iPhone 4S battery hell? Here's a way out | BetaNews
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Homemade iPhone 4s battery from a 18650 : r/techsupportmacgyver
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The difference between iphone 4 and 4s
iPhone 4S Battery Life (Real-World Tests): EveryiPhone.com
iPhone 4S Battery vs. iPhone 4 - YouTube
Notes From iFixit's iPhone 4S Teardown: 512 MB of RAM, New 3G Chip - MacStories