Substantial battery drain when using Siri | MacRumors Forums
Apple's iOS 13.1.1 for iPhone Now Available, Includes Patches for Keyboard Security Flaw, Battery Drain Bug & More « iOS & iPhone :: Gadget Hacks
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