The cost of reconfiguring the battery holders will likely be counterproductive. I'd just get the 6's and call it good.I am looking for the cheapest way to get this baby running, then maybe burn and turn it this fall, or next spring.
It wont be run all day on a golf course its a beat around the camp ground in the running from camper to bathroom to buddies camper type of situation that requires about 2 hours a weekend of actual use.
I didn't personally look at the battery compartment, but the fella I am getting it from stated 8 batteries.