You can ducttape/gaffatape a CR123 lithium (3v) battery in there too. We found it was better to use the opposite side of the contacts (trying to tape it on like it does have the 9v battery style contacts results in nothing) to make contact with the battery and it made the camera work nicely. Fuji filmpacks are sometimes a little cheaper than the polaroid stuff and comes in single packs so it's useful for trying it out without ending up with extra film packs you can't use in case it really doesn't work.
If the first film turns out black, try retaping the battery and making sure the contacts are clean.