Sealife Sea Dragon Rechargeable lithium ion battery (7.4 volt, 3400 mAh, 25Wh) for Sea Dragon Fluoro-Dual Beam, 1200F, 1500F, 2000F, 2100SF, 2300F Auto, 2500F, 3000SF Pro Dual Beam and 3000F Auto Photo/Video/Dive Lights. Includes protective cap. The Sea Dragon battery may only be used in the specified Sea Dragon lights. The battery features an integrated protective circuit for safety. Keep a spare battery charged with your external charger that came with your light so you never miss an opportunity to capture that perfect shot.