I've got 2 of the Walmart bargain basement batteries in my tractor. I think they were $29.95 ea. Been in since '03 without a hiccup. I tend to agree with Ron, get 2 of the most economical batteries you can find until you get th OA331 running. As far as the OA331, don't be surprised by it's anemiic power. It actually can get the job done just takes more time and fuel. As long as yours still has a muffler on it, they are amazingly quiet, especially to those used to a multifuel. Another cool thing is you can put the overdrive trans in for a little more road speed (theoretically).