A-A-50618 Battery, Storage (Portable, Sealed, Maintenance-Free, Lead-Acid) 6 Volt, 300 Ampere-Hour Type 6V-S-300 AhThis Commercial Item Description covers a 6 volt (normal and reversed), 300 ampere-hour sealed, valve-regulated lead-acid (VRLA), storage battery with a low rate and deep discharge duty cycle for use on Naval surface ships.