If iOS 14 is causing battery drain, you might need to wipe your iPhone

Software History
Apple Releases iOS 7.0.6 With Fix for SSL Connection Verification
iOS 12.4 jailbreak publicly released for modern iPhones - 9to5Mac
What's new in iOS 13.3 developer beta 1? - 9to5Mac
Apple Facing Lawsuit For Allegedly Forcing People To Buy Newer Models By Slowing Down iPhone 4s with iOS 9
Apple releases iOS 7.1.1 | ZDNet
Issues restoring from iOS 12.3.2? Here are some workarounds
Apple releases iOS 13.5.1, patching out the Unc0ver jailbreak
Apple update fixes iOS 14 issue with default mail and browser apps
iPhone 5s users reporting issues with Touch ID after iOS 7.1 update
Apple releases iOS 12.4.1 with jailbreak vulnerability fix - 9to5Mac
Apple releases iOS 7.0.2 with fix for Lock screen passcode bypass flaw - 9to5Mac
iOS 14 switches default apps back to Apple’s Safari and Mail after a reboot
iOS 8.1.1 said to address iPhone 4S and iPad 2 performance problems
iOS 13 is killing background apps more frequently, iPhone owners report
https://web.archive.org/web/20210225063324/https://discussions.apple.com/thread/5575236
Will Location based reminders work on ios… - Apple Community
https://web.archive.org/web/20210226170557/https://discussions.apple.com/thread/5331165
battery indicator stuck at 1% - Apple Community
iOS 10 Update Error Causes ‘Plug into iTunes’, Fix Requires iTunes [u]
This 5-second video will crash your iPhone
Apple pulls iOS 8.0.1 update, after killing cell service, Touch ID | ZDNet
iPhones ‘bricked’ as Apple releases iOS 10 (and then rapidly fixes the problem)
iOS 9.3.2 Bricking Some 9.7-inch iPad Pro Devices With 'Error 56' Message [Updated]
New 13.2 Update Bricking Some HomePods [Update Pulled by Apple]
Apple pulls iOS 9.3.2 for 9.7 inch iPad Pro following reports of bricked devices with ‘Error 56’ issue
After bricking saga, Apple re-posts iOS 9.3.2 update for 9.7-inch iPad Pro [Updated]
Apple sued for slowing iPhone 4S with iOS 9 upgrade
Class Action Lawsuit Accuses Apple of Crippling iPhone 4s With iOS 9 Update
Some users experiencing bricked HomePod after updating to iOS 13.2 [Update: pulled]