A-A-50610 Battery, Storage (Portable, Sealed, Maintenance-Free, Lead-Acid) 2 Volt, 20 Ampere-Hour, Type 2V-S-20 AhThis Commercial Item Description covers a 2 volt, 20 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.