SOLVED] iPhone Battery Draining Fast after iOS 16/15/14 Update
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 no longer signs iOS 13.7, blocking downgrades from iOS 14 - 9to5Mac
Why is my iPhone 13 Pro that I recently bought (1 month old) dropping so fast after the iOS 16.3 update (99% to 23% in 5 hrs 12 min screentime), even though the battery health is 100%? - Quora