Had a bad battery about a month ago. So I got a new one at carquest. About a week ago my battery was dead. They gave me a new one but I was wondering if something was draining it. Like my scanmaster it shuts off when I turn the key off. But its hooked up too the computer port all the time. If this battery goes bad again something has to be draining it. I was told to watch the battery w/a mutilmeter gauge.. any ideas here thanks