The Deka Dominator Gel series of batteries is designed to offer reliable, maintenance-free back-up power for renewable energy applications where frequent deep cycles are required and minimum maintenance is desirable. Applications include: Marine Applications, Remote Monitoring, Cathodic Protection, Railway Signals, Smart Grid sites and more. There is no need to check fluid levels. The Dominator's gelled construction also eliminates vibration damage. the Dominator even works under water!