Well, the same thinghappened to me this morning. I stopped at the park on the way to work with a quick flight in mind. I turned on the Tx and started to plug the battery into the esc. I have the blue connectors (don't know what they're called) that, theoretically can't be plugged in backward. I can't see close up with my glasses on, so as I started to make the connection, I thought, "I'd better pull my glasses down to BE SURE." Too late. While I couldn't have actually plugged the connection in backwards, I did allow them to touch and contact was made. Iwas, for an instant, able to see the surface of the sun between my fingertips.

Subsequent checking of the battery shows two (out of three) live cells and one dead. The esc has no burnt smell, but I suspect I'll be replacing it as well. Dang. If it ain't one thing, it's another.