I just got a new Hammer mod (clone, I think. Not really sure how to tell yet) from e quake. It's pretty cool, but I'm having some problems that I think are battery related. It was hitting pretty good before I charged the battery. I'm using an Efest 1600 18650 3.7v battery. I don't really like the long battery, since I have to use the extension "tube" and it really takes away from the hammer look of the mod. Is there a better battery that I should be using? Also, any modifications that I should use to make this hammer really hit would be greatly appreciated!