Or, I will explain what I do. When I install a new OTA update, no matter what it is, I always restart my iPhone and erase everything completely, I do not make backups because the applications that I use are few and my photos and others are on iCloud.
And even so I have the problem that it heats up and consumes too much battery, it has nothing to do with the way in which or how I update it, because I always do the restore, and can confirm that, since I installed 13.5.1 my battery It is very bad, I have 95% since I changed the battery for a new one in a legitimate Apple store.
So the theory that there is a poorly optimized application does not apply, because they are the ones that I have always used since 2016, as I mentioned. I restore my phone from time to time and have never experienced this until 13.5.1 from 10.1