ADPOW battery charger. The fully automatic charging system eliminates the worry of overcharging the battery. When full charge is reached, it will automatically maintain the battery with a small current in buffer mode. The device is adapted for charging sealed lead-acid and helium batteries. But it can also be used to charge more common acid (car) batteries. When charging automotive acid batteries, charging takes longer. This system is optimal for all sealed lead-acid and helium batteries.