Why does the POCO F7 Ultra overheat seriously when charging at high speed with the screen off?

The POCO F7 Ultra is equipped with the industry-leading 120W charging technology, and the charging speed is at a high level in the industry. After turning on the Speed up charging mode, there will be a certain amount of heating, which is normal.
The temperature rise is within the safety standard and can be used with confidence. If you feel that the current heating experience is poor, you can try to turn off the Speed up charging mode in [Settings] >> [Battery] >> [Charging options] to improve the charging temperature rise experience.
In addition, it is recommended that you place the phone in a open place when charging, reduce contact and wrapping with fabrics such as clothes and quilts, ensure a good heat dissipation environment, and effectively reduce the temperature.