My car failed to start Saturday night while out for dinner, wouldn't jump. So I ran to Advanced Auto. Lucky me, they would have to order it, only $149.00! I went back to pull it out and charge it overnight, tried once more to jump and it started up. Everything looked clean, no visible problems, when I pulled off the positive cable it looked a little dirty, that was the problem. I did notice some special top with what looks like some small vents, which is what makes them so expensive, according to Advanced Auto.