12 Volt 135Ah AGM Battery; Dimensions: 13"Lx 6.8"Wx8.7"H; Includes 8mm terminal posts; Reserve Capacity of 265 minutes. Maintenance Free Operation. The Vmaxtanks XTR31-135 is an Extreme Series 12V 135AH Deep Cycle AGM Battery. Sealed Construction The unique construction and sealing techniques of VMAX tanks guarantee leak proof operation in any position with no adverse effect to capacity or service life. VMAX tanks are classified as non-spillable, fully sealed, non-hazardous batteries and can be mounted in any position. Great for Marine/RV, Pontoons, Boats, Heavy machinery, Electric Vehicles and more!