My battery has taken a noticeable hit on my 11Pro and Air3. My S5 Apple Watch isn’t doing all that great with watchOS7 either.
Are you doing a clean install and then using it without any apps. If you’re reinstalling all your apps and one of them is the culprit then the clean install isn’t going to make much difference.
I posted this in the iOS 14 thread, but 11 Pro battery has taken a hit for me. 2 hours of usage went from 100% to 66%, where usually I'd land at around 80%. There is steady drain even when phone is inactive. The background usage in the morning was caused by Mail, even though I don't have any accounts set up for it. Now trying iOS 14.2 beta to see if it's better.
I’ll be the first to say it it looks like iOS 14 isn’t doing too well with battery life on my SE 2020. I haven’t changed any of my settings from before the update but in the span of 30 minutes I lost 8% battery.
All I was on was Health, Settings (to look at what’s eating my battery) and Safari. For some reason Mail is now always running in the background and I can’t figure out how to stop it.
Almost none of my apps background refresh.