Sudden shut-down - iPhone 6S Plus
My iPhone 6S Plus has recently begun to switch off unexpectedly, even though it has been charged.
Symptoms:
Battery level reading might be showing 39% or 51% or 89%, but suddenly the phone will shut down. There might be a few seconds warning (e.g. swipe gesture fails to respond, web pages slow to load). After charging for 2-3 minutes, the phone can be switched on and the battery level shows 8-10%, so either the battery level software is ‘wrong’ or the battery is dying.
Settings:
The Battery Health shows as 100% capacity, with Normal peak performance.
The phone is set to Optimised Charging.
Running iOS 14.3 (although issues were there before this upgrade).
I have tried the following remedies:
- Repeated Charge/Discharge cycles (to 100%, with phone OFF. Then play radio station, until down to 1%).
- Hard reset
- Factory reset
It will play the radio for >10 hrs. But if another app is used, the phone shuts down immediately.
Any suggestions about this issue?
What are my options?