Dev,
To answer your question about the motor controller. The Raven 1 had a different style motor controller with a flip switch. Then came the upgraded controller that many people purchased including myself. More elegant and a bit better sonically. Those are the only 2 I know of of the non battery varient. I know the buttons have changed due to changes in availability but nothing major.
As for the original battery PS mine needed to be upgraded as my batteries would no longer hold charge for more than 4 hours. I had my BN for 3-4 years. They were 6 hours originally.
Dev,
You purchased a second hand unit. And had no direct dealer support. Not from Jeff and not from TW. So your batteries were already old. Anyhow, I changed my batteries but at the same time changed the board. I heard a notable improvement and tested it on my Spectrum Analyzer. It was spot on 33.33. Sound was impressive. I decided to do a battery run down test. Next day it is still going. Finally I did it again. Same thing about 20 hours (I think). I emailed TW about all. His simple interchange is yes, batteries last much longer. Which is excellent. I then said it sounds better. He then answers, he learned a few new things. Enough said.
To Answer Your other questions and get everything in context,
I bought my table from TW directly. Been to his house. Heard his system : Amazing Cessaro Horns system that reveals everything. Wow. Saw his office, factory you name it. He has some customers with high end systems that are beyond anything that you would see on Audiogon. Massive horn systems, top of the line dynamic speakers. He knows how his turntable sounds by listening to it in multiple environments with purpose built state of the art systems.
This was several years ago, but years after I purchased the turntable. I went to the Munich Audio Show and visited TW, and did some sight seeing in Europe and visited my other halfs family in Holland which was very close to TW's office.