I was fiddling about setting up a new car and reversed the polarity to my esc , I was only using one battery from a saddle pack to check the esc when I Connected it to the battery the Bec started smoking instantly and I disconnected instantly, the esc is a a HW xerun v3.1 there was no motor connected at the time and my receiver was not plugged in either. After all this I checked and esc still switches on and fan runs ok nothing was hot straight after it happened (esc or battery) but there is a slight burn mark on the Bec board just near the wires is it fried regardless that it switches on or is it possible that it will be ok