iPhone 4S: why has standby time dropped? | Technology | theguardian.com
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Battery Life of iPhone 4S Draining Too Fast? Try Calibrating the Battery | OSXDaily
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Unavoidable battery drain overnight no matter what I try. You can see there were no apps running in the duration either. iPhone XR on iOS 15.1 : r/ios
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Tips to Keep iPhone 4S Battery from Draining Fast | PCWorld
Apple iPhone 4S - Battery life - AT&T
iPhone 4S Battery Life (Real-World Tests): EveryiPhone.com
