I got 6,000 MAH batteries and they were way too big, so had to ship them back to HB and took a 40 dollar loss which sucks. I got the 5,000 65c ones and they fit. So far the boat is still in the box and I have only charged the batteries and discharged to storage percentage. I'm hoping by next week I can spend a day just getting it ready, lubed and broke in a little bit at the lake. My dad wants to see it go real bad.