I'm having the same issues!
I noticed my battery went from 100% down to 95% with only 15min's of use! This is extremely frustrating and unacceptable!. How can Apple release such flawed and buggy software and think it acceptable, particularly with the premium they charge for their products! If the OS is not ready, don't release it!!
My batteries heats up regularly and the phone is warm to touch, since upgrading to the 13.2 and subsequent updates. i'm constantly restarting/resetting my phone. It killing my battery!!
I use my phone constantly throughout the day for work and rely to my phone battery. Now I will need to have my phone tethered to a power bank to get through a meeting, let alone the day!! Tim Cook are you having to do this, would you think this is acceptable?
Just as another example of how bad this is! I just charged my phone to 100%, unplugged it then looked away for 3-5 mins, the battery is down to 95%! This is Crap!