Our best for use in Marine situations and particularly muscular for use in the Backup Sump Pump industry. This design will even the best Marine wakeless Cycle batteries. For the power you need WHEN you need it, this is the to buy. It its charge longer and can handle the demands of the best aft up sump pumps. Whether using straight 12 Volt back-up systems, or connecting through a power inverter, this battery has the reserve capacity to keep going prolonged after different batteries have. When compared to first-string wakeless cycle batteries, this one no maintenance and lasts 2-3 times as prolonged. When the others die in 3 years or less, this one 5-10 years with 7-8 years on common.