Put the watch in a good heat dissipation environment to charge (such as: indoor, desktop), the environment with poor heat dissipation conditions will lead to slower heat dissipation when charging (such as: outdoor sunlight, inside the car, bed, sofa), so that the temperature rises.
Please avoid using the watch while charging, the watch will be hot when charging, and the same will be hot during use, if you use the phone while charging, it will lead to more serious fever. If many background applications are started, you are advised to delete them with one click.