Graflex Fingerprint camera

Hello,
If this doesn't belong here, please move it to more appropriate page.
I have just acquired a good condition Graflex Fingerprint camera. I know it took some sort of battery, does anyone know which type? If the worst comes to the worse, I will just to make my own battery pack with common batteries and use that in some kind of non-destructive way. Further more, what size Graflex film holder this camera takes, 2x3 comes to mind, but I don't know if Folmer Graflex made that size in their "notch-down-the-middle" kind.
Any help would be nice.
Thank you,

Also post your questions on www.graflex.org forum.

You may find some info or get some answers on www.graflex.org.
There is a person who posts on that site that is a goldmine of Graflex info.

the one i have uses 2 by 3 -- not sure about the batteries, but they look like common D-cells stacked up.

I found a 1915 and a 1923 Graflex Catalog on line that show the Fingerprint camera. Both catalogs show additional No.789 batteries available.
I cannot find any information on a No. 789 battery.