i would say its running 6s.... 40c+ tho... as it must draw quite alot...

it has motor breaks by the sound of it... so name an esc that would come in an rtr that can handle more the 6s... with motor breaks...

those diffs need a heavier oil... :S rear tire ballooning is a bit weird :P

redcat do an rtr brushless truck... looks quite similar to this one... and it runs 6s as well :P