Hi, I just recently ordered some Ultrafire protected button top 18650 2600mah cells for my M1X, and a tube extender. I put it all together and its not powering on. I have been usuing ultrafire 18500's with it previously that worked fine, but I was looking for a longer run time. Whats the problem here? Anyone else have this problem? Everything seems to fit fine and is making contact. The cells are also freshly charged.