2. On the phone desktop, click "Settings".
3. On the Settings page, slide the screen down and click "Battery".
4. On the battery setting page, click "Battery Health".
5. There is an "optimized battery charging" at the healthy bottom of the battery.
6. In fact, the ios 13 system is turned on by default to optimize battery charging. If it is not open, please click the switch on the right to open it.
7. Click the switch again, and you will be prompted. You can select "Save before tomorrow to close, close or cancel". If you don't need to close it, just click Cancel.