I have now decided to get to the bottom of the battery problems with Android 13 and Samsung Galaxy S7, as far as I can as a normal user.
The Rom LOS 20 from @Ivan_Meler
and NikGapps 13 Core are installed on my Daily Driver S7. The device is fully installed with all the apps I need and is ready to use, but it consumes a lot of battery power. I currently have to reload several times a day in order to always have 80% full memory (this is urgently necessary for me as a severely disabled person and wheelchair user, because I always have to reckon with having to go to the doctor or even a hospital, for example).
LOS 20 from @Ivan_Meler
is now also installed on my test S7, but without the Google stuff, i.e. without GApps, I am trying to set up this test S7 completely, but without (!) any GApps, and I use the Aurora Store and F-Droid. This is because many say, that the high power consumption is due to the GApps.
Previously (!) I had installed the ROM "EvolutionX" on the test S7, which runs with GApps and is Android 13. It's very nicely done, but I found that EvolutionX uses a similar amount of battery as Ivan's LOS 20 with NikGapps.
Well, with LOS 20 from Ivan and WITHOUT GApps on the test S7, I have to say that the battery consumption is not exactly low either.
Question: can it be that Android 13 (LOS 20) on the old Samsung Galaxy S7 consumes too much battery power per se, because Android 13's power requirements are simply very high, maybe too high for those old smartphones?
If so, would it then make more sense to only operate the Samsung Galaxy S7 with an older LOS, i.e. about 18 or 17, i.e. Android 11 or 10?
I would be gratefü for some answers.
Have all a nice weekend!