Marine/RV batteries are available in three different versions–starting, dual purpose, and deep cycle.The starting marine/RV battery is designed similar to that of a wet car/starting battery with carrying handles and is designed for high current and shallow discharges. The wet dual purpose marine/RV battery is a hybrid between a starting and deep cycle battery that is specifically designed for high vibration in marine/RV applications.The deep cycle marine/RV battery is designed for deep discharge applications such as a trolling motor, golf cart, AWP and floor care equipment.A marine/RV deep cycle or dual purpose battery will work as a starting battery if it can produce enough current to start the engine.Good ventilation is required for all wet (or “flooded”) batteries to dissipate the gasses produced during charging.For saltwater applications use only a sealed AGM or Gel Cell battery to prevent the formation of deadly chlorine gas that can occur if battery electrolyte is mixed with saltwater.