Replace Battery iPhone 4s
Remove the following screws securing the battery connector to the logic board
iPhone 4S Battery Replacement iFixit from replace battery iphone 4s, source:ifixit.com
How To Easily Remove, Install & Replace An Apple IPhone 4S Battery
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When reinstalling the pressure contact be sure to clean it with a degreaser such as-source:ifixit.com
Replacing iPhone 4S battery Hacker s ramblings.
How to Replace iPhone 4S Battery Do It Yourself Guide.
How to Replace the Battery in an iPhone 4 4S.