The Y50-N18L-A3 GEL is a 12 Volt 21AH GEL (Maintenance Free) battery. Common uses for the Y50-N18L-A3GEL: ATVs, Motorcycles, Personal Watercraft, Jet Ski's, Snowmobiles and more. The Mighty Max Y50-N18L-A3GEL is a TRUE DEEP CYCLE battery that can be mounted in any position, requires no maintenance. Polarity: Negative on left, Positive on right.