I’ve just spent an hour on the phone to Apple and managed a battery countdown .. whilst they ran a diagnostic.. my iPhone 6s ran great until I downloaded Ios14.3.. after this you can actually do a countdown as you watch the battery drain.... you won’t be surprised that the diagnostic showed no issues. personally, I wish Apple would get rid of the aluminium and cutting edge quality because let’s be honest they deliberately brick your phone after a few years so why do quality.... it’s an insult to pay a £1000 for a phone just to have the manufacturer press the button.... mines clearly the logan’s run edition.... just to add, my works Samsung galaxy hasn’t missed a beat and the battery lasts DAYS .... not hours (sorry minutes under iOS 14.3 on the plus side my friendly Apple rep said I could buy a new one.. to add to my Aluminium collection 😡😡😡😡😡🤬🤬🤬🤬🤬🤬