Apple's mobile phone comes with a battery health display function. In Settings-Battery-Battery Health, the maximum capacity of your current mobile phone battery will be displayed. If the maximum capacity of the battery is too low to about 60%, you need to go to Apple's business hall to replace the battery.
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Precautions:
Don't use your mobile phone for a long time in high or low temperature environment, such as exposing your mobile phone to the sun. Extreme temperature will cause great damage to the electronic components of mobile phones, and the battery will have a relative impact.
Some friends may not dare to sleep at night. I am afraid of continuous charging for several hours, and I am worried that overcharge will cause damage to the battery, so don't worry. Now, the smart phone will intelligently choose to automatically turn off when it is fully charged. There is no such thing as overcharge, so don't worry.