The loss of the battery under normal use, the health of the battery is below 80%. Generally, after charging the iPhone for more than 500 times, that is, after using the iPhone for about 14- 18 months, the battery life will be reduced and the capacity will reach about 80%. It is recommended to change the battery. Because Apple takes 80% as the threshold, if it is lower than 80%, the system will forcibly turn on the performance management function, and the mobile phone will be stuck. It is recommended to replace the battery.
It should be noted that if the mobile phone is under the warranty period or under the AppleCare+ service plan, you can enjoy the service of replacing the battery for free. If your mobile phone doesn't have AC+ and is not under warranty, there is a charge for replacing the full-screen iPhone. Although the domestic battery is cheaper and it is easier to replace the battery, it is recommended to buy the original iPhone battery at Apple's after-sales point when replacing it, which is safer.
The above contents refer to Baidu Encyclopedia-Mobile Phone Battery.