build a gmaxx and i need help

[suicideneil]

You must never disconnect or try to connect a motor when the esc is powered up, you must ALWAYS turn it off before making wiring changes- was the motor still partially disconnected when you plugged in the lipos? If it was, then the esc tried to make the motor chime ( the musical tones come from the motor phases ) but couldnt, resulting some kind of short circuit or massive current discharge.

Now you need to order some new bullet connectors to replace the damaged ones- you might be able to salvage the lipos, depends if they are swollen, and where the damage occurred ( you can easily re-attach wires to the metal cell tabs if they melted off )- pictures?