Here is what happens. I drive the car maybe once every two weeks. So I disconnect the terminals from the battery when I store it in the garage when I am not driving it. other wise the battery will drain itself. I reconnect the terminals and lately I turn the key and nothing happens. But the battery has juice. Then I turn it again and the starter will barely crank once. Then I will turn it again and maybe it will slowly crank or not at all. After doing this several times I will finally get a nice crank and the engine will start. Now this used to only happen after I first started it without driving it for awhile but the other day it did the same thing after I started it up and drove it around for 15 minutes. Then did it again later that day. Maybe it could be something else if you have any advice.