These ordnance batteries are specially designed to meet military specifications.Certificate of compliance is available on request. They are available wet or dry and with ratings up to 750 CCA and 230 min. reserve capacity. The maintenance-free types feature calcium grids with microporous polyethylene envelope separators and double glass-mat insulation. Screw-in vents are submersible to 4-feet underwater and make battery accessible in the event of accidental overcharging. Full-frame grids, heavy-duty plates, high density oxide and pure, demineralized electrolyte prevent internal shorts and withstand high cycling service for longest battery life. A durable ribbed polypropylene case provides protection in abusive applications with special leak resistant cover keeps battery compartments clean and dry up to a 45deg tilt. Anchor lock elements resist vibration damage for longer service life. Most models include handles for ease of transportation and installation. Over 250 quality control checks assure reliability and long service life. Proudly made in the U.S.A.