Ok......
This was an Emerson 9X power LED Mini-Flashlight. It had 9 LEDs in it. My wife bought it at work, CVS Phamacy, for 3.99 (plus discount).
I only used the "tube" and the battery cap. I changed the button to a pushbutton switch (picked up from the local RadioShack). I made a new "+" connection with a new PCB. Non-Conductive epoxy to adhere into place. Soldered up my connections. Everything was really easy to fit in place. The lid........is no lid at all. It is epoxy. Pushed it in while soft........waited til hardened, then sanded and painted.
It has a 510 connector. And it is currently using a 14500 3.7v battery. Vaping HUGE plooms.
You should check out the Time-Warner Cable PV I done, as a joke, one night. Vapes like NO JOKE!!!!!!! It's Awsome.......Laughable, but Awsome!