Ok guy I just got back from racing.Theres was a CRAP load of people their getting ready for the big race tommorw and sunday ( www.dirtoval.com ) And I witnessed two ESC go up im smoke.The first was on a sprint car.The other was on a xxx-t of a idiotic kid who though it was funny.He was soon yelled at by the announcer/owner to put it down and back away.There was so much smoke it was crazy.So be carefull and have fun.Also whenever your car starts smoking back the hell away cuase if its your batts it could blow up.