I once had a brand new ESC (generic brand) that killed both my servo and my Rx, both devices each had a puff of smoke the instant I flipped the switch... turns out the BEC was faulty, it was sending the full 4S right into the Rx!



I bought the ESC through HobbyKing and they warranted the ESC and Rx but did not cover the expense for the servo which I bought from Savox... which created a whole other debacle to where I have stopped buying electronics from HobbyKing and never bought another Savox product since