Why would an iPhone battery suddenly drop to zero when it was at 40% right before? - Quora
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iOS 15 Battery Drain Problems? 13 Ways to Fix iPhone Battery Draining Fast (2022 Update)
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iPhone battery draining fast all of a sudden - 10 proven fixes |Tech-addict
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iPhone Battery Draining So Fast All of a Sudden? 10 Tips to Fix
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