Concorde recombinant gas (RG Series) valve regulated lead acid (VRLA) batteries for engine starting, emergency / essential power, and standby power applications are constructed with cutting edge Absorbed Glass Mat (AGM) technology. Concordes proprietary PolyGuard Microporous Polyethylene Separator shields the positive plates against shorting, shock or vibration. No other manufacturer offers this dual layer insulation protection feature.Since 1986, Concorde recombinant gas RG Series AGM-VRLA batteries have been adopted by the majority of military and corporate users worldwide for all types of aircraft. Certified nickel cadmium battery replacementSuperior 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 chargedRG Series batteries ship HAZMAT EXEMPTRG-380E/40LS is a fireproof stainless container with side vent tubes and stainless cover with fabric lifting straps and hold down bar. Stainless temperature sensor mounting pad in front.