Hey, I m in trouble..
I am using Iphone 7 and my problem is overnight battery draining issue My battery health is 82%.
I updated ios 14.4.1 after this update i've facing this issue.
Apple recommends that the battery should be replaced once the battery capacity, in battery health, reaches 80% or less. Your iPhone is at 82% and may be exhibiting behavior associated with a failing battery. Have your iPhone examined at the Apple Store or at an Authorized Service Center. Let them diagnose the battery and then get it replaced if necessary.
Axel F.