After update UI 4.1 ( Android 12 )

[lovelane]

My handset Samsung galaxy M21. Before update ( when UI 3.1, Android 10 ) battery show 2days and 15 hours and battery Darin smoothly but after update latest version UI 4.1( Android 12 ). It's battery drain so fast and 100% battery show me 2days and hour's left. How can I solve this problem. Pls help me 

[Nishitkohli]

It will automatically recalibrate with you usage

[bodheet]

Once factory reset your device so it can be fresh again

[NOOB_1ST_ACC]

So factory data reset

[RAJENDRENG33]

I have Galaxy M30. Can I download UI 4.0