وعليكم السلام
Don't worry about those things, they will drive you nuts. Just observe the real life figures.
In case of doubt, just observe the average battery timings (averages per complete charge figures) that it calculates and displays on main app screen.
Or to check overheating, just check this battery temperature graph history.
The graph i posted for demo shows that the battery temperature (orange line) never reached over 35C (right side values). So it remains at very safe temperature and i have nothing to worry about.