Right now, I can't remember which battery I got exactly, but I did get a 620CCA battery it was either the 67 or the 67EF on the Supercheapauto webpage. Anyways, from what I have read, you have done a 3 hour trip and you still had battery problems when you had the pit stop. Isn't that a clear and positive identification, that your problem is the alternator?? Battery is near new and I doubt that is the problem(however it is possible). but if the alternator is on it's way out, it's not gonna charge the battery during a 3 hour. Hence the reason when you charge it over night, it starts up fine first thing in the morning. Once you have made a few more trips, you start to have issues I am no expert here, Ralph has more knowledge and experience, but that is what stands out for me.