The YTX24HL-BS GEL is a 12-Volt 21 Ah GEL (Maintenance Free) battery. Requires no addition of water during the life of the battery. The MIGHTY MAX YTX24HL-BS 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 YTX24HL-BS GEL: ATVs, Motorcycles, Personal Watercraft, Jet Ski's, Snowmobiles and more. Factory activated GEL battery, maintenance free, no acid pack needed, advanced design works right out of the box and requires no maintenance yet offers the option to prolong the standard life by adding extra electrolytes. True deep cycle battery that can be mounted in any position, resists shocks and vibration, long-lasting high performance in high and low temperatures. Environment friendly, leaving no pollution to the environment while charging and discharging, zero fumes or chemicals escape the battery casing, all chemical reactions are done within the battery itself.