Was pretty quick with 18 cells - easily had enough balls to still lift the front, and the cells were old and not very well balanced at all... not sure on speed, as i... well, i have never really bothered worrying about it too much...

On 4S tho, it's just as good... the Neu is a 2650kv finned can - IMHO, any more speed is pretty useless for anything except showing off to ppl/mates in the park or something for 5 minutes - then you get over it...

The only reason i would ever really go with a 6S setup, is for the efficiency side of things... there is plenty of power and speed on 4S. (that is almost a contradictory statement, as i need 6S packs to match up to the 2230 motor, which i have no intentions of getting rid of -lol-)