Extend Your iPhone's Battery Life by 3 Hours Using Low Power Mode in iOS 9 « iOS & iPhone :: Gadget Hacks
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![Apple iPhone 4S battery test is complete, here go the results [TEST]](http://cdn.gsmarena.com/pics/11/11/iphone-4s-battery-life/gsmarena_002.jpg "Apple iPhone 4S battery test is complete, here go the results [TEST]")
Apple iPhone 4S battery test is complete, here go the results [TEST]
How to Fix iPhone 4S Battery Life
45+ tips to save battery on iPhone
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Homemade iPhone 4s battery from a 18650 : r/techsupportmacgyver
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