My Ford 3000 gas has a car battery with 580 cold cranking amps. It has seemed real weak. Going through tune up with a several restarts I have to hook up my battery charger with the start boost to give it that extra push. The battery is only a couple months old, but if its not pushing enough amps I might as well replace it with the proper size. Otherwise I am putting a strain on the starter and shortening the life off it. What size is everyone using?