I was planning to use my old iPhone 3GS for weekend project but I discovered that the screen was popped out and the back was bulging, I took it apart and this
How to replace the iPhone 3G or 3GS battery | iMore
How to replace the iPhone 3G or 3GS battery | iMore
iPhone 3GS battery swells to absurd size [Update] | Engadget
Battery Upgrade Kit - iPhone 3GS
iPhone 3GS Battery Replacement | Eli Duke | Flickr
iPhone 3GS Battery Problems - Read This Before You Replace It! — navigate
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Original Battery replacement for iPhone 3GS
iPhone 3G Replacement Battery
OEM Apple iPhone 3GS Battery - ETrade Supply
How to replace the iPhone 3G or 3GS battery | iMore
How to replace the iPhone 3G or 3GS battery | iMore