SeaLife ReefMaster RM-4K Spare Battery

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