Ensure that the USB charging port or charging base is dry and clean to avoid fouling and blocking metal contacts.
If the device is wet or dirty, use a soft brush or cotton cloth to clean the charging metal contacts on the USB charging port or the charging base. Ensure that the charging port is dry and clean.
Please replace the charging cable and charging plug (such as the same specifications of mobile phone charging cable and charging plug, etc.).
The battery in the watch is old and needs to be replaced