Me too. I’m a diehard 6S user that has kept phone up to date and have had NO issues with it ... until it updated to 14. Literally overnight I went from a perfectly usable phone that would last me all day on a single overnight charge to one that is basically dead by lunch - with minimal usage! The phone gets hot to the touch while simply using it for normal things for anything longer than a few seconds.
According to the phone, Battery Health is great, as I would expect since there was literally never an issue UNTIL this update. 14.2 did not fix any of the issues.
As I sit here typing this and looking at my stats, my phone was last charged to 100% an hour ago (it’s now at 48%). Last week, I averaged 2 hours 45 minutes of On Screen time with about 10 hours of off screen time - all while using about 260% of battery. (That means I had to charge it at least twice each day, after a full charge every night).
This ‘update’ has been nothing but problems. I’ve had iPhones ever since they came out, but now I’m looking at switching to Android for the first time ever. My phone is unusable as it is. And no. Upgrading to a new phone is not going to fix and iOS problem.