How many batteries are less than the iphone can be replaced for free.

Generally, after the health of the iPhone battery is lower than 80%, the battery needs to be replaced. When the health is lower than 80%, the system will force the performance management function to be turned on, and the mobile phone will get stuck in some cases. This restriction can only be lifted by replacing the battery. Take iPhone11(iOS13.5) as an example, the following is a detailed introduction:

1. The battery health is less than 80%, and the iPhone is usually charged more than 500 times, that is, the battery life will be reduced and the capacity will reach about 80% when the iPhone is used for about 14- 18 months. 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 become more stuck. It is recommended to replace the battery.