battery problem

Hi i just installed the latest version on my Mi 5X and at the first boot i have 45 percent i was using it for some time and it went down to 29 percent everything good and i rebooted to TWRP to install magisk i installed it and booted ok but i noticed that the battery went up to 50 percent!! then...

I have very a big problem with battery in my (2 months old) Redmi Note 4 with SnapDragon. After last update, the battery does not charge up to max. Now its max for it is 92%! Not touched phone (WiFi and LTE connection turned on), but the phone was not touched. After 3 hours, phone is...