After upgrading ios, the battery health suddenly dropped.

What you want to ask is what happened to the sudden decline in battery health after upgrading ios? Excessive use, improper charging method.

1, the mobile phone plays games for a long time or does a lot of data processing. With the increase of service time, the performance of the battery will gradually decline, and the health of the battery will also decline.

2. Using the mobile phone while charging, or continuing to use it when the battery charge is less than 20%, will accelerate the battery loss.