This charger charges all 2, 6 or 12V DC sealed lead acid batteries automatically. When the battery is fully charged, charging current is reduced to prevent overcharging. Automatic voltage and current control ensures that the connected battery stays completely charged and overcharging as well as gas development is prevented. Provided with short circuit and wrong polarity protection. In case of connecting the battery with wrong polarity, the red LED will burn and charging current will be cut off.