The Y50-N18L-A3 GEL is a 12V 21AH GEL Maintenance Free battery. Requires no addition of water during the life of the battery. The Mighty Max Y50-N18L-A3 GEL is a TRUE DEEP CYCLE battery that can be mounted in any position, requires no maintenance. When a Gel Cell battery is charged, no hazardous fumes escape the battery case, gases are processed within the battery itself. Common uses for the Y50-N18L-A3 GEL: ATVs, Motorcycles, Personal Watercraft, Jet Ski’s, Snowmobiles and more.