Apple reveals bizarre reason why some iPhone owners are experiencing 'vampire battery drain' | The Sun
Apple's iOS 13.3.1 Update Reportedly Drains iPhone Battery Fast
Help] WiFi idle energy battery drain. Woke up and phone was at 50% from 100%. I've had battery drain issues since updating to iOS 13.3 from 12.4 : r/jailbreak
Apple's iOS 13.3.1 Update Reportedly Drains iPhone Battery Fast