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Using optimised battery charging, your phone reduces the time it spends fully charged which prolongs the overall battery life.
1. Find "Charging Optimisation"
Press Battery Health & Charging.
Press Charging Optimisation.
2. Use optimised battery charging
Press Optimised Battery Charging to turn the function on or off.
3. Return to the home screen
Slide your finger upwards starting from the bottom of the screen to return to the home screen.