It doesn't matter if they say that it checks good. I had a battery in my truck that would discharge completely, every day.. about 24 hours time. Well, I would get it charged at Checkers, and they would check it after the charge and say it was good. Well, I did that for about a week. I was getting a little angry, because my battery was under warranty, so one day, I took the battery in to get charged.. I called them about an hour later and told them to hold my battery for a day, because I had to go to work. Well, I went in the next day to pick it up.. they said it was good to go, and I told them to check it (since it was sitting for a day) And sure enough, it was bad... I got a free new battery! Ha, they weren't happy!