Why does my iPhone 5s battery suddenly drop from 43% to 20% and then 10% suddenly? Is this battery to be replaced or is there something other malfunctioning? - Quora
IPhone 5S & 5C Battery Replacement - How To : 9 Steps (with Pictures) - Instructables
Apple acknowledges iPhone 5S battery life issues - NotebookCheck.net News
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Apple: iPhone battery issue due to iOS 5, fix coming - CNET
Apple: Some iPhone 5S units have battery issues, will be replaced – The Mercury News
Apple Blames iPhone 5s Battery Drain on 'Manufacturing Issue' | PCMag
Battery for use with iPhone 5
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