In general, the loss of lithium batteries is inevitable. Fast charging of iPhone has little effect on the health of battery, and the performance of battery declines in a short time, which is often caused by unreasonable use or habit of mobile phone.
The first is to use the mobile phone while charging. Because the charging and discharging are carried out at the same time, the battery load is too high, and the battery protective layer of iPhone is seriously aging due to heat, and the battery capacitance drops rapidly.
In fact, the maximum healthy capacity of this battery comes from the data of the battery chip. The chip records the charging and discharging information of the battery and controls the battery efficiency.
Starting from iOS 1 1, Apple has added a "battery health" function, through which users can know the usage of mobile phone batteries and whether they need to be replaced.
After "power anxiety", many users suffer from "battery health anxiety". According to Apple's official statement, when the maximum capacity of the battery is less than 80%, users need to repair or replace the battery. For many people, the maximum healthy capacity of the battery is less than 100%, which seems to be not far from the maintenance and replacement of the battery.