How does Apple's mobile phone improve battery health?

Apple's mobile phone can improve the battery health value by turning on and optimizing charging. The operation method is as follows:

Device: Apple iPhonexs

System: IOS 13.3

1. Find the settings of Apple's mobile phone, as shown below:

2. Open the settings and click the battery bar, as shown in the figure below:

3. In the "Battery" column, find the battery health efficiency, as shown in the following figure:

4. When you turn on the battery efficiency, you can see the optimization of battery charging, and you can optimize the battery, as shown in the following figure: