Android - who exactly eats up the battery in a few hours?

Question

Android

The Android phone began to get very hot and consume the battery in 4-5 hours. Even when charging is connected, it discharges faster than it charges, i.e. still slowly going downhill. To charge, you have to turn it off. Googling the problem gives a bunch of superficial and useless advice such as reboot, close all apps, look in the battery settings, clear the cache, make a backup and a full reset. I did everything except a full backup and reset.
There are no problems in the battery settings: Android System - 20%, Google Play services - 19%, Android OS - 16%.
Replacing the battery with another did not work either.
Are there any deeper ideas on how to identify which app is eating a battery if not in itself?

Answer 1

the android phone began to get very hot and drain the battery in 4-5 hours.
How old is the battery? It looks like she is sailing to the land of the eternal hunt. Batteries are now modular and it does not die at once, but modularly - the capacity drops, the operating time decreases, and when the modules are shorted, it gets very hot.

Answer 2

Want a detailed analysis?
Here is a tool for analysis https://github.com/google/battery-historian
Here is a more intelligible description of the process: https://developer.android.com/studio/profile/batte...

Answer 3

As already mentioned, I would start by enabling debugging and analysis
1) adb shell dumpsys batterystats
2) adb logcat e:*
google