I recently updated my M51 to OneUI 3.
A couple days after the update, 1 Hr 45 Mins on YouTube would only take 8.3%. Right now, 40 mins on YouTube went through 5%. It's the same with other apps as well.
I've kept almost all apps in sleep or deep sleep. Only auto-sync is on. Yet, I am still facing sudden battery drain.
What can I do about this?