E3.420 - Marine Lithium BatteryE3 Lithium Marine is the smallest, lightest, most powerful and most shock resistant battery available today. Featuring a waterproof carbon fiber case, E3 Lithium Marine batteries have been torture tested in the extreme conditions of offshore powerboat racing. E3 Lithium Marine Batteries can fire 1500+ horsepower race motors in a package half as big and nearly one tenth of the weight of traditional marine batteries. The batteries exceedingly light