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Will a iPhone 5s battery work in a iPhone 5?

You will not be able to use the other battery. Besides connectors being different, please look at these specs. iPhone 5 battery: 1440 mAh, 3.8V, 5.45 Watt Hours. iPhone 5s battery: 1558 mAh, 3.8V, 5.92 Watt Hours. I’ve attached the battery and guide to fix it. Good luck! iPhone 5 Battery How to replace your iPhone 5 battery