Battery draining
I bought iphone11 in January of 2020, present my phones battery health is 81, since 2-3 days the battery started to drain fast even if not in use it is draining 1% per 8-10 mins. If i use instagram or you tube it is draining even faster like 1-2 % for less than 5 mins. I don't understand why this suddenly started to happen, even though the battery health is 80%+.
iPhone 11