How can I get my battery health back to normal?
How can I get my battery health back to normal?
you can't,
batteries begin to die the moment they are produced
all you can do is to delay their demise
About the battery and performance of iPhone 11 and later - Apple
and maybe iPhone Battery and Performance - Apple Support
and Batteries - Maximizing Performance - Apple
people report apple does not change the batteries until they are lower than 80% in health