Funny story, I accidentally reversed polarity on the plug of the esc of my "Wee Willy" a couple days ago, and it got hot but still worked. I flew it at least 4 times yesterday, and the last flight had a perfectly dainty landing! However, when I picked it up, it was dead, no power to anything. The BEC in in the ESC was bruised by my carelessness and finally gave up at the second I touched down on my last flight of the day.