The slow charging of Xiaomi mobile phones may be due to the following reasons:
1. The charger power is insufficient, it is recommended to use the original Xiaomi charger or the charger that supports fast charging;
2. The charging cable is damaged or aged and needs to be replaced.
3. Mobile phone battery aging, battery life is short, need to replace the battery;
4. Too many mobile phone applications cause high CPU usage, which affects the charging speed. You are advised to stop some unnecessary background applications to reduce CPU usage. You are also advised to charge the device in idle state to avoid affecting the charging speed.