Unleash the Banshee this year with the new Group 34M deep cycle marine battery with dual terminals Banshee batteries are designed to withstand rigorous deep charges as well as long slow recharges. The Banshee marine deep cycle battery is a direct replacement for Optima D34M batteries and has excellent recharge capabilities for long-lasting performance Banshee marine batteries are produced and manufactured using only the most up-to-date materials. All Banshee group 34 batteries have a built-Hydrometer which easily tells the current state of your battery life Our group 34 marine battery is rugged powerful resilient and should be the only battery you rely on for cranking and ignition and lighting. The advantage of buying Banshee Marine Batteries is that they have more battery plates. More battery plates mean more plate surface area Which 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 are they can handle 400 charge-discharge cycles to 80 depth of discharge Enhanced Flooded Battery or increasingly referred to as EFB technology on the market cannot be installed on its side or upside down EFB batteries are an enhanced version of standard wet . flooded technology primary benefits of EFB technology are improved charge acceptance and greater cyclic durability when operating in a reduced state.