The Power-Sonic PS-1250 F1 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 FEATURESSEALED 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 construction.ECONOMICAL - The high watt-hour per dollar value is made possible by the materials used in a sealed lead-acid battery: they are readily available and low in cost. LONG SERVICE LIFE - Under normal operating conditions, four or five years of dependable service life can be expected in stand-by applications, or between 200 and 1000 charge/discharge cycles depending on the average depth of discharge. DESIGN FLEXIBILITY - Batteries may be used in series and/or parallel to obtain choice of voltage and capacity. Due to recent design breakthroughs, the same battery may be used in either cyclic or standby applications. RUGGED CONSTRUCTION - The high-impact resistant battery case is made either of non-conductive ABS plastic or styrene. Large capacity batteries frequently have polypropylene cases, all of these materials impart great resistance to shock, vibration, chemicals and heat.