Optima Batteries 8006-006-FFP 34M BlueTop Marine Starting Battery 12-Volt, 800 Cold Cranking Amps, Size: 10" x 6 7/8" x 7 13/16" tall, Weight: 38.4 pounds, Dual SAE &amp; 5/16" Stainless Steel Stud Posts Reserve capacity of 100 minutes for constant performance Optimal starting power even in bad weather Fifteen times more resistant to vibration for durability Ships in Certified Frustration-Free Packaging.Internal Resistance:0.003