Notes From iFixit's iPhone 4S Teardown: 512 MB of RAM, New 3G Chip - MacStories
Incipio offGRID battery case for the iPhone 4S (review) | ZDNET
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How To Easily Remove, Install & Replace an Apple iPhone 4S Battery - YouTube
Apple iPhone 4S: Thoroughly Reviewed
iPhone 4s - Wikipedia
iPhone 4S Battery Life Worse for 3G Data and Media as Compared to iPhone 4 - MacRumors
Testing the iPhone 4S' battery life - CNET
iPhone 4/4S iPhone 5/5S/SE/5C/5S Battery Replacement Part | eBay
Amazon.com: MFI-Apple Certified - ibattz Mojo Vogue Removable Battery Case for iPhone 4 and 4S White 1700mAhX2 fits all version of iPhone 4S/4 : Cell Phones & Accessories
iPhone 4S gets torn down, reveals slightly bigger battery and Sony camera sensor
Stuck in iPhone 4S battery hell? Here's a way out | BetaNews
Apple Iphone 4 & 4S BATTERY REPLACEMENT. Step by step full guide. - YouTube
iContact iPhone 4/4S Battery Case - Black (IC-BC100)
Comparing the iPhone 4S vs iPhone 4 vs iPhone 3Gs vs Galaxy S II | OSXDaily
OEM Authentic Original Battery Replacement for Apple iPhone 4 1420mAh 4s 1430mAh | eBay
Looking inside an iPhone 4/4S battery | Rip It Apart - Jason's electronics blog-thingy