I agree boomstick the insulator isn't there from what I can see the battery may be shorting out because the copper is touching the steel walls of the atomizers lower deckI would use a fine file of some sort and knock down any of the rough stuff and make it flat and smooth again. Clean and inspect the whole connector real well, and clean and inspect the mods connector. See what that does.
Edit: I just looked at the pics again. Is the insulator in the connector ok? Can't see anything and usually you can see at least a bit of it.