1) never ever EVER leave a battery plugged in (while chatting or otherwise)
2) without a thorough investigation on the user's part, checking to see if there's dirt or debris or something else that's caused the motor to bind up, it's really hard for anyone here (that doesn't have a crystal ball) to diagnose what's wrong.
3) considering that in another thread you've allowed the wheels to bind up the rear hubs to the point the car is only driving one wheel, you could have easily caused terminal damage to the motor > your thread >
http://www.oople.com/forums/showthre...669#post771669