I have a 1993 EZGO gas golf cart. I put in a 12 volt Lawn and Garden battery. Is this sufficient for this unit. The reason I ask is that it will run good for about an hour then it will die out. If I charge the battery it will run again, but then die out. Someone told me that the battery was not big enough but I am starting to think it is the generator. Any advice or help would be greatly appreciated.