Optima Batteries 8025-160 25 RedTop Starting Battery 12-Volt, 720 Cold Cranking Amps, Size: 10 5/16" x 6 13/16" x 7 5/8" tall, Weight: 39.5 pounds, SAE Posts Reserve capacity of 90 minutes for constant performance;Up to 3X longer life Optimal starting power even in bad weather Fifteen times more resistant to vibration for durability.This item is not for sale in Catalina Island C20 Capacity:44 Amp hour Internal Resistance - 0.003