Unique expanded plate grid design increased number of plates for maximum starting power and to withstand severe vibration resistanceAdvanced lead-calcium technology holds its specific gravity more than 3 times longer than conventional lead antimony batteriesHeat sealed case to cover protects against leakage and corrosion and provides for extra strength and durabilityAbsorbed Glass Mat (AGM) Separators an advanced battery technology that eliminates theneed to ever add waterMaintenance Free. no need to add water, but periodic charging required when not in useSmall size, lightweight, huge power