My Iphone 13 pro max has 87% Battery Health but the percentage indicator on the screen drops from 90% sometimes from 50% to all the way 10% , I did a manuel calibration on my phone(discharge battery all the way and let it sit for 3 hours and charge it to 100% ,Not entering the details i did it the right way ), and nothing changes the same thing , please any information how to FIX it .
iPhone 13 Pro Max, iOS 17
This most likely means your battery has failed. The Battery Health indicator cannot detect all possible battery failures. It is best at measuring normal battery degradation over time, which is different from a flat-out failure.
You will most likely need to get your battery replaced. See iPhone Battery Repair & Replacement - Apple Support
This most likely means your battery has failed. The Battery Health indicator cannot detect all possible battery failures. It is best at measuring normal battery degradation over time, which is different from a flat-out failure.
You will most likely need to get your battery replaced. See iPhone Battery Repair & Replacement - Apple Support
IPHONE 13 PRO MAX BATTERY DRAINS SUDDENLY FROM 90% 50% to 10%
