I doubt it is a cut down 4 or 5 cell because there is no rolled edge on the bottom. All of the unstamped 5 cells that I have seen still have the rolled edge around the bottom circumference, just like a normal 2 or 3 cell has...meaning two separate pieces of metal put together. Maybe it's just the photo, but this looks like a single piece of metal for the bottom tube. It just doesn't look like a 4 or 5 cell in the photo.