TMS Battery YTX20L-BS GTX20L-BS Maint Free Sealed Motorcycle ATV Jet Ski Snowmobile Yamaha YFM Kodiak Big Bear Wolverine Harley Softail Flst Buell Dyna Sportster Honda Rincon Fourtrax Yamaha Grizzly Maintenance-free, never needs re-filling. Checking or refilling the acid levels is not possible and necessary. Advanced lead-calcium technology pumps up starting power Long lasting which means High Performance Maintenance Free batteries will last up to three times longer than conventional batteries. Dimension: 6 3/4" x 3 3/8" x 6"