The OrcaTorch 18650 3400mAh battery is a rechargeable lithium-ion cell rated at 3.7V, 12.6Wh, built for OrcaTorch dive lights and other high-drain devices. It's compatible with the D520, D530, D550, D570, and D580, and OrcaTorch-branded batteries are recommended for guaranteed runtime, though other brands can be used if they meet the 18mm diameter, 65-70mm length specification. Battery life on OrcaTorch dive lights typically runs 1 hour 30 minutes to 2 hours at high brightness, depending on the light. The cell is rated for more than 500 recharge cycles and is fitted with a protection circuit in the anode, fully covered by a steel shell to reduce short-circuit risk from collision or impact, along with over-heat and pressure relief protection. A USB-C direct charging version is also available, distinguishable by its 70mm length versus 69mm for the non-USB-C version, with a full charge taking approximately 200-220 minutes.