How to check the battery health of Apple mobile phone: Go to Settings-Battery-Battery Health (Beta) and check the battery health at the maximum capacity. Note: If the battery is less than 80% healthy, it is recommended that you contact the local Apple Store or a third party to authorize the replacement of the battery after sale.
If the iOS system detects that the iPhone battery is running too fast, you will see a "battery life suggestion" prompt in the "Battery" settings. Because the "Endurance Suggestion" is an optimization suggestion given according to the current settings of the iOS system, the optimization suggestion you see may be different every time. Take the prompt "reduce brightness" as an example: go to Settings >; Battery, tap Reduce Brightness, and drag the Brightness adjustment slider to reduce the brightness of the screen.