Under normal circumstances, the mobile phone battery is kept at the middle power (50-70%), which can better maintain the life of the battery.
When I bought the Huawei p40, the staff at the official flagship store told me to fully charge the phone on the first day back home. Of course, the plug should be unplugged after charging to avoid a long time of charging, which will also affect the utilization rate of the mobile phone battery.
In addition, try to avoid exposing the mobile phone to high temperature or low temperature for a long time, because the temperature difference of the environment will accelerate the loss of the mobile phone battery.