2. Because the battery capacity of the hanging waist fan is limited, the charging time is not enough to fully fill the battery. In addition, the power of the charger may not be enough to provide enough current to the fan, resulting in slower charging.
3. If you want to fill the battery of the hanging fan, you can try to extend the charging time or replace the charger with a higher power.
In addition, consider a backup battery so that it can be replaced when needed.