Apple's mobile phone battery drops by 5% a year.

What you want to ask is that it is normal for Apple's mobile phone battery to drop 5% a year? Normal.

We need to know how the battery health is calculated. Apple's mobile phone has a battery health detection function, which can detect the maximum capacity and current capacity of the battery, so as to calculate the health of the battery. The higher the health, the longer the battery life. Under normal circumstances, the battery health of Apple's mobile phone will drop by 5% to 10% after one year of use, which is normal.