My battery is bad and it%E2%80%99s run down at 99% I use it when is charging only if not it all run down
What wrong with my battery i want to know please?
iPhone XS Max
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Make an appointment at the nearest Apple location to have your iPhone evaluated for free.
Once the diagnostics are complete, the staff will explain your options.
Make a Genius Bar Reservation
Genius Bar Reservation and Apple Support Options - Apple
Or use this link to see if Apple can run remote diagnostics on your iPhone: