The 6 batteries are explained here:
http://www.dpreview.com/reviews/fujis2pro/page4.asp
...
..
.
I'm currently looking at the FUJI S2 Pro or the Canon 20D for use in real estate because I need the wide angle ability and the ability to shoot the views that make some homes such treasures. Which of these, other suggestions are appreciated too, are the best for a wannabe advanced amateur? I can't see spending $3500 for some of the top of the line models, but man oh man does that FUJI S3 give me goosebumps. What is the deal with the S2 taking 6 batteries???!!!

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic