You gotta remember.. Tamiya didn't really shave off the sides, prolly cuz most if not all tamiya cars were meant to be run w/ the same type batteries. The ones I'm using.. heheh... No need to saddle although ladder packs always have better CG. I still run Stick packs=).. lol.. No hassle w/ dat filing stuff. But I did file off the corners, just to round them out.. =).. STICK PACKS ALL THE WAY!!! lol