1. First open the settings and enter the battery options.
2. On the battery interface, you can see the current battery capacity, usage and usage time.
3. If there is something wrong with the battery, you can click on the battery health to view the maximum capacity and report of the battery.
4. The maximum capacity of the battery has been reduced, so you can consider replacing the battery once. You can take your mobile phone to Apple's officially authorized after-sales service point to replace the battery.