Yuasa YUAM720GH Lead_Acid_Battery 12 Volt, 20 amp-hour, 310 cold cranking amps, high performance sealed maintenance-free battery Totally sealed and spill-proof - all acid is absorbed in special plates and absorbed glass mat separators Factory activated - filled, sealed and charged at the factory Advanced lead-calcium technology hold its specific gravity more than 3 times longer than conventional batteries No need to ever add water