A-A-50609 Battery, Storage (Portable, Sealed, Maintenance-Free, Lead-Acid) 12 Volt, 15 Ampere-Hour, Type 12V-S-15 AhThis Commercial Item Description covers a 12 volt, 15 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.