Yuasa AGM batteries are Maintenance Free, with no need to add water, but periodic charging required when not in use. Advanced lead-calcium technology – holds its specific gravity more than 3 times longer than conventional lead antimony batteries. Absorbed Glass Mat (AGM) separators absorb electrolyte making the battery nonspillable, the valve regulated design eliminates water loss and the need for refilling. Factory Activated (FA) – the battery is filled with electrolyte, sealed and charged at the factory. Size/Weight - Length: 6 7/8 in (175 mm), Width: 3 7/16 in (87 mm), Height: 6 1/8 in (155 mm), Weight with Acid (lbs.): 13.9; Specs - Capacity Ah: 18 @ 10HR, Regular Charge Current (Amp): 1.8, C.C.A. @ 0 °F (-18 °C): 270