Recombinant Gas - The RG Series are low resistance, valve regulated lead acid (VRLA) batteries.Superior starting powerReliable essential power in the event of a generator failureLow impedance designMaintenance freeConstructed with non removable vent valves - no addition of electrolyte or water requiredAerobatic: Non spillable at any altitude or attitudeFactory tested to assure airworthinessShipped fully charged and ready to installManufactured with absorbed glass mat separators (AGM)Short vent tubes internally threaded with a 1/8\" NPT, high impact polypropolene container, powder coated aluminum cover and stainless steel hooked hold down bar.RG Series batteries ship non-HAZMAT