It is recommended that the battery should not be less than 20% before charging. Don't keep charging for too long after charging, and don't play big games while charging. The hotter the mobile phone, the more fully loaded it is. The damage of high temperature to the battery is irreversible, and the more serious the damage to the battery life is.
In addition, when storing the iPhone for a long time, it is recommended to keep half the power. At the same time, long-term high temperature or exposure will quickly damage the performance of the battery, so you should avoid storing or charging the iPhone in high temperature environment, including direct exposure in the sun for a long time.