Yeah, they are tiny cells. I felt like I was a giant working on a sub-C pack.
An 8 cell, 9.6v nominal pack would be around 11v fresh off the charger (~1.4v/cell). Some electronics may not like that much overvolting. But I don't really like a 7 cell 8.4v nominal value either - some devices see that as getting close to a dead regular battery. But, fresh off the charger, they read about 9.6v, which is safer IMO. Anyway, there was easily enough room in the 9v case for another cell, they just spaced the cells so it was filled up.