This is my first post, I got what seems to be a genuine svd with short tube (express kit) and two aw imr 2000mah batteries and a dual trustfire charger (I know) I will get a better safer nitecore one, it came with it, anyway the 18650 fits fine like someone said above at least 9 threads or more, I'm used to egos with my kanger Protank2 and evods, this button (fire) is soft but clicky, seems to be that it cuts off or turns off maybe the 3 click as opposed to 5, or I have to press in a certain spot, I was only trying an evod so far, maybe it wasn't making contact inside all the time, i see its spring loaded strongly, two air holes in beauty ring dimples, the pbusardo review had one hole, he mentioned when not locked if you touched the +or-buttons from dark screen it moved up or down an increment just to display the setting, now it doesn't, obviously they listen to reviewers, anyway I am not the type to crank stuff dow, I am wondering I only have 7 days today included if I should pay priority shipping fl to ca to exchange this, Its beautiful hits hard but seems to me like I have to press the button pretty hard, only had a few hours with it, do people with the short tube long battery 18650 screw it down to where it doesn't rattle, I am wondering if this could be pressing on the control head a bit, maybe affecting the switch response, which is why I didn't go with the zmax, or sid, and advice, btw I'm broke currently till next week and in general as a freelance worker, thank you.