Unleash the Banshee this year with the new Group 31M deep-cycle marine battery with dual terminals. Banshee batteries are designed to withstand rigorous deep charges as well as long slow recharges. Banshee marine batteries are produced and manufactured using only the most up to date materials. Our group 31 marine battery is rugged, powerful, resilient, and should be the only battery you rely on for cranking, igniting, and lighting. The advantage of buying Banshee Marine Batteries is that they have more battery plates. More battery plates mean more plate surface area. That means that the Banshee battery has more power – twice as much as conventional batteries. Banshee batteries are capable of providing engine cranking as good as any other battery equally sized, even at very low temperatures. And they can handle 400 charge-discharge cycles to 80% depth of discharge. Maintenance-free Marine Battery Replaces Optima D31M 8052-161 SC31DM.