iPhone XS Max battery drains rapidly after unplugging from charging
iPhone Xmas battery drain after unplugged from charging
[Re-Titled by Moderator]
Original Title: Battery drain
Has the battery of your iPhone XS Max ever been replaced?
If the Battery Health on your iPhone in Settings/Battery is below 80%, you will have to get the battery replaced.
How you describe it, it must be 70% or less.
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copied from: iPhone Repair and Service - Apple Support