Okay so I think the guy I bought the 600 from probably put in his oldest battery he had to sell it and the battery is no good. I thought it would be a cheap battery to buy because it is so small, but the cheapest one I can find to fit is $80.00 and it only has 450 CCA's. I have a decent size auto battery but it won't slide down into the battery area. There is a large hydralic line on one side and then the lip where the seat goes on the other side. I am wondering if anyone has a good modification to mount a regular sized battery. I was think that the lip where the seat rests could be cut back, or a battery box could be mounted to the cross piece behind the seat and above the engine. I set my auto battery above the compartment and hooked it up and the engine started so nicely and ran smoothly, unlike with the junk battery. Anyway, thanks