My wife and son were bashing about in the (flat) back yard tonight and on the street. Mix of two surfaces: short St. Augustine grass and blacktop. I put pack #3 in and the steering worked, but no power to the rear tires. The light on the ESC was working. So I unplugged the motor and tried a spare I had in my box. Viola, power. I tried the motor included with the kit and nada. I've never seen a motor burn up in just two battery packs. Seriously not impressed.