also, where do you live and how cold is it? what kind of vehicle do you have?

it is possible to have enough power ot tun on the lights and not turn over the battery, but it's weird you would have that with two batteries. you might have a problem with the actual battery cable itself, but what you need to do is test the battery to see if it is putting out enough amps

www.engadgethd.com - the other stuff i'm looking at