My son's 2003 Polaris 330 magnum's battery was weak, but you could still pull start it. Then all of a sudden, it would pull start, then quit running after a few minutes. Now it will not start. I pulled the spark plug, it did not have any spark. When I removed the battery, it was completely dry. My question is, do you have to have a working battery for the Polaris to run? Or do I have other problems?