Charging 12 hours unchanged green may have two points :1. If the charger is unplugged for 10 hours, the car can ride the normal mileage, that is, the charger control circuit has a problem.
Solution: Replace the charger or use a charging timer to control the charging time.
2. If the charger is unplugged for 10 hours of charging, the mileage of the car is significantly shortened, that is, one of the batteries has been seriously vulcanized and has lost water, and the battery is heated or has been filled with drum deformation when charging.
Check method: After charging, use a multimeter to measure each battery, and the voltage is slightly lower.
Solution: Add some water to the battery with the battery repair device to repair the battery before use