1. Check if the charger indicator light is faulty: Confirm if the green light on the charger cannot be displayed due to bulb or wiring issues, even if the battery is fully charged.
2. Check battery status: Use a multimeter to test the battery voltage and confirm whether the battery has truly reached a fully charged state. If the battery voltage has reached the normal full charge level but the green light of the charger is not on, it may be a problem with the charger control circuit.
3. Analysis of the normal operation of the charger cooling fan: The continuous rotation of the fan is usually for cooling purposes, but if the charger does not switch to standby mode after the battery is fully charged, it may be due to a malfunction in the charger's control circuit or temperature sensor, which makes it impossible to correctly identify the battery status and adjust the working mode. It is recommended to contact the manufacturer or professional maintenance personnel for maintenance or replacement of the charger.