Since updating my Galaxy S21 FE to One UI 7, my battery drains much faster than before. For example, I played Spotify for only 30 minutes with my Buds Pro 3, no Dolby Atmos, and no screen usage (music was playing in the background while in my pocket). During this short time, my battery dropped from 70% to 54%, which is a 16% drop without any screen-on time.
Even 24U and 23U had the issue but fixed
(Used only 1 day for testing purposes so results and problems can vary)
