That battery would be just about perfect. I think the Kyosho spur(in the link above) is a direct fit for the LSP diff. but not positive. It will quiet things down if your anti-racket but the stock spur would work fine as long as you get one of Mike's hardened pinions and don't mind the noise. As far as gearing, I'm not a hot bodies guy but I would imagine with the KV of the 10L being around 2400 that you would probably want to go as low as 13 or even 12 with the stock spur. Probably as high as 14 or 15 with the Kyosho spur. Check out the "What's your runtime" sticky thread in the brushless section of the forums. I think there are a couple of guys with HB set-ups listed in there.