Overcharging Protection: KOAH PRO batteries are equipped with overcharging, short-circuit, and surge protection. Multi Charging: Charging three batteries at a time saves plenty of time. Whether you are traveling or doing extended video recording, this triple charger works great as spare or backup batteries. Multi Charging: Charging three batteries at a time saves plenty of time. Whether you are traveling or doing extended video recording, this triple charger works great as spare or backup batteries.