This SeaLife Rechargeable Lithium-Ion Battery is a backup for your SeaLife DC2000 Camera system. Power is supplied by a rechargeable 3.7 v 1130 mAh, 4.2 Wh rechargeable lithium-ion battery that will provide 2+ hours of operating time, with the ability to shoot 200+ photos on a single charge. The battery weighs 0.8 oz. (23 g). The battery can be charged inside the camera through a USB cable and wall charger. Don't miss a shot/video while diving. The battery makes a great save-a-dive-kit item.