Battery 12 Volt 35AH Marine Deep Cycle HI Performance Battery Ideal for Boats and 18-35lb Minn Kota, Minnkota, Cobra, Sevylor and Other Trolling Motor (12V 35AH, Group U1) Beiter DC Power Dimensions: L=7.7" W=5" H=6.1" Heavy Duty Grids: Power King heavy duty lead tin alloys provide an extra margin of performance and service life in either float or cyclic applications, even after repeated over discharges. Maintenance Free Operation: There is no need to check specific gravity of the electrolyte or add water to VMAX tanks during float service life. In fact, there is no provision for this type of maintenance.