The batteries for the Super are most deffinitely not hearing aid batteries ;-) And they are readily available from MidWest. They last a long time as long as the capacitors in the camera do not leak. But there's a simple solution to that also...
Yes, all the info you could want has already been posted above.
I would add my thoughts as a Super user...
The advantages to a Super are deffinitely for hand-held usage. The rangefinder cams are also readily available from Midwest and easy to change. The Top viewfinder works very well. When hand-holding, it's much easier to rotate the entire camera than just the back (like any other rangefinder camera). On a tripod, rotate the back. The electric release is great to use. I've carried my Super all day long using a neck strap and hand shooting just like a 35mm. It's just a lot of fun, especially with Grafmatics...
The down side of Supers. The rangefinder will only work well with lenses from 90mm through 210mm. Graflex had made adpters to use up to the 15 inch tele and down to 65mm, but no one seems to even know they exist let alone able to find one... The Super lens boards needed to take advantage of the electric release are very difficult to find. I've been searching for a long time now... And to fully enjoy a Super, you have to find one with a top viewfinder, working electrics for the shutter release, and fully working rangefinder system. Not difficult to do, but many don't pay attention... If you find a lens/electric lensboard combo and want to use the side flash connector, you can buy a new flash cable for it, but it's a bit expensive from Paramount. I made my own for about $2.00...
Both my Supers came with changed, misaligned GG/fresnel (or no fresnel) focussing panels. Since the Super was originally designed to use a fresnel, this also has to be checked on a used camera...
The Super Speed and plain Super are identical except for the name and the Graflex 1000 shutter. I bought Super Speeds because I collect Graflex cameras and simply wanted one of the 1000 shutters. I don't use them. If they are properly CLA'd (by Fred Lustig), they are quite useable even at 1000 speed. I have no plastic gears in mine by the way. All brass & steel... I heartily recommend something like a Nikkor 135/5.6 as a replacement, although the stock 135 Optar is a fine lens.
As for the electric lensboards: If you don't mind doing without the electric release, brand new plain lensboards are also available from Midwest...
I like the Super a lot. I would never get rid of my Pacemaker Speed, but I use the Super.
Now if someone would just make new Super lensboards and come up with a powerful enough electric flash with a 1 1/12 inch round handle, I'd be a very happy camper...