Check your drivetrain too. If you are careening along at a pretty good clip then you hit a wall or whatever it could be that something in your drivetrain is a little bit loose and it catches and binds, when those CIMS go from full speed to nothing with power still applied they probably draw a tremendous amount of current.
Just a thought. It doesnt really explain the battery thing, but what I can say is that what you are having happen should not happen. I know, im so helpful.
