Tool: iPhone 8
Operating system: iOS 14.4. 1.
Step 1: Take Apple 8 as an example. First, open the setting function in the red box, as shown in the figure below:
Step 2, then select the battery function in the red box, as shown in the following figure:
Step 3, then select the battery health function in the red box, as shown in the following figure:
Step 4: Finally, open "Optimize Battery Charging", as shown in the following figure: