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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
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Make iOS Alert You When Your iPhone Only Has 5% Battery Life Remaining « iOS & iPhone :: Gadget Hacks
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Amazon.com: JUBOTY Battery for iPhone 5S 5C(Not 5/SE) 3500mAh, New Upgraded Li-Polymer High Capacity 0 Cycle Battery Replacement for iPhone 5S 5C with Professional Repair Tool Kit : Cell Phones & Accessories
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