Maintenance free. No need to add water but periodic charging required when not in use. Absorbed Glass Mat (AGM) Separators – an advanced battery technology that eliminates the need to ever add water. Advanced lead-calcium technology – holds its specific gravity more than 3 times longer than conventional lead antimony batteries. 18 Amps. Wet (YTX20L-BS) If high power is top priority in a replacement battery, look to Yuasa’s High Performance MaintenanceFree batteries. Yuasa means more power, less maintenance and longer life. Yuasa’s High Performance Maintenance-Free batteries are your best choice for motorcycles, utility vehicles, scooters, ATVs, riding mowers, personal watercraft and snowmobiles. All of the features of a standard maintenance-free PLUS Increased Power – Up to 30% more cranking amps thanks to a radial grid design and additional plates. Battery Details: Battery Type: YTX20L Battery Family: Factory Activated, Maintenance Free Voltage: 12 Capacity (10-HR): 18 Dimensions: 6 7⁄8 in. x 3 7⁄16 in. x 6 1⁄8 in. Weight: 13.9 lbs. Metric Dimensions: 175mm x 87mm x 155mm Acid Volume: N/A oz Amps: 1.8 C.C.A: 270 Country: USA