ok if I have 12 vdc, my starter is rated 0.5 KW, I think it would be, KW times 1000=500divided by voltage, 12vdc = 41.66 amps. so I found a battery ratted at 80 cca (cold cranking amps) so can I use that. I am at the point that I need a battery it has a short frame and not much room for the...