get a new battery, autozone sucks at checking batteries. I took mine there a while back, they checked it and said it was good ( i knew it wasn'). I went accross the street to napa, they checked it and said it was bad. I got a new one, problem solved. My friend had the same experience with his mercedes. He had came back from lunch one day and said he took the batt to auto zone and they told him it was good. I said dude get a new battery(i had already checked his car out). He bought a new battery, problem solved.