That makes sense with one battery, but how about with the two?
The motor has been perfect. I've had a few displays replaced, first one quit after a rain storm. I went through a few more, we eventually traced the problem to the main harness which was then changed and that took care of that problem. The thumb throttle was also replaced under warranty.
I just went out and checked the mileage, it has 8,566 on it now. That's since November 2010.