- Absorbent Glass Mat (AGM) technology for superior performance. - Valve regulated, spill proof construction allows safe operation in any position. - Power/volume ratio yielding unrivaled energy density. - Approved for transport by air. D.O.T., I.A.T.A., F.A.A. and C.A.B. certified. - U.L. recognized under file number MH 20845. - CE certified.