Like some of the reviews below, I don't know anything about cars. So if a person were to overcharge me or tell me this or that it's hard to not take their word unless it seems fishy, but thank god the crew at auto zone were friendly and fast to my needs. My battery light came on and they tested to see my battery and turns out I need a new alternator :/...yay! If only they could change it for me lol but awesome and nice people there.