How many apps have network permission? Did you install anything from the play store at all? As a rule of thumb, the play store and everything on it is spyware.

I had the opposite experience. I was pleasantly surprised by the battery life you can get when your phone isn't full of shitware apps and even when you do install shitware, the OS helps you confine it.

It happens in every profile. Only one has the play store and is rarely used, doesn't run in the background