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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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How to make your iPhone's battery last as long as your old Nokia | by Nathan Jeffery | Black Plunger | Medium
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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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