Materials/tools: iPhone8 IOS 12.0 system.
To check the "maximum capacity" of Apple's mobile phone battery, please refer to the following steps:
1. Click the setting sign of "gear" on the mobile phone desktop to enter, as shown in the following figure.
2. After entering the "Settings" page, click the "Battery" column to enter.
3. Click "Battery Health" in "Battery" to enter the next step.
Fourth, you can see the "maximum capacity" of the mobile phone on the "Battery Health" page. If it is less than 80%, it needs to be replaced (the actual situation can be based on the user experience).