The Power-Sonic valve regulated sealed lead acid batteries are maintenance free, easy to handle, rugged and economical. It has a characteristic of high discharge rate, wide operating temperature, long service life and deep discharge recover.. 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. PRODUCT FEATURES SEALED MAINTENANCE FREE - The valve regulated, spill-proof construction of the POWER-SONIC battery allows trouble-free, safe operation in any position. There is no need to add electrolyte, as gases generated during charging are recombined in a unique "oxygen cycle". EASY HANDLING - No special handling precautions or shipping containers - surface or air - are required due to the leak-proof construct