The battery information of Apple's mobile phone can be viewed in the settings. Open the settings, slide down to find the battery, and click Enter to see the relevant information of the battery, such as the health status of the battery, the last charging time, the time taken to open and close the screen, and the power of the App. Through this information, we can know the health status of the mobile phone battery. If the displayed battery information is less than 80%, you need to replace the new battery, otherwise it will affect the experience of Apple's mobile phone. If it is an old model, it is recommended to buy a third-party brand battery on the e-commerce platform and replace it yourself or find a repair shop. And if the battery is under warranty, the health is less than 80%, and the Apple Direct Store can replace it for free.