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.
The Performance and Characteristic of the YT12B-4 GEL Battery
1.    Maintenance Free / GEL configuration 2.    No leaks, spills or contact with acid 3.    No acid mist and pollution to the environment when charging and discharging. 4.    High capacity: 10-20% higher comparing to that of VRLA.5.    Low self-discharging and durable for storage.6.    Nice ability for resilience after over-discharge and the capacity of high discharge current increases by 30% over VRLA.7.    Amazing performances in all temperature conditions8.    Battery Dimensions in Inches : L (8.07) x W (3.42) x H (6.37) 
Genuine Mighty Max battery Product