Spare battery for SeaLife ReefMaster RM-4K Underwater Camera The powerful 3.8V 900mAh 3.42Wh Rechargeable Li-Ion Battery is good for 2 hours of operation. The battery can be charged inside the camera through a USB cable and wall charger.– Fits SeaLife ReefMaster RM-4K Camera– 3.8V 900mAh 3.42Wh Rechargeable Lithium Ion Battery
