Please help my iPhone battery capacity
Please help my capacity
[Re-Titled by Moderator]
iPhone 7 Plus, iOS 15
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There may not be a lot that we can do.
this is just a user to user tech support forum.
there is also the reality that batteries have a finite number of charge cycles they can Support and yours may simply be wearing out.
I will link an article with some battery tips but you may be facing the prospect of replacing the batter - or may be money ahead to consider a new device.
iPhone Battery and Performance - Apple Support