Apple iPhone 8
Turn optimised battery charging on or off
Using optimised battery charging, your phone reduces the time it spends fully charged which prolongs the overall battery life.
Press Settings.
Press Battery.
Press Battery Health.
Press the indicator next to "Optimised Battery Charging" to turn the function on or off.
Press the Home key to return to the home screen.
1. 1. Find "Battery Health"
2. 2. Turn optimised battery charging on or off
3. 3. Return to the home screen