I run a xxxt with a 5700kv system on 5000 20c, 3800 30c, 5000 20c lipos.. There's a BIG difference in run time and performance between nihms and lipos.. I's strongly recommend the lipos..
My motor rocks on the tracks I run.. Kinda open a little and more long straights where the bigger motor buys can pull away..
Loads of stuff for sale- lipos, xxxt's, mamba max system (new), tons of spares charger new