Deal extreme doesn't have much other info.
The module has two springs. One outer and one inner.
I assume the inner spring is the positive terminal.
When I watched this video, the guy pulled off the outer spring, and dropped it into his Sure-Fire without it. I assume the batteries he installed are a pair of 18650's with the positive on the center spring?
Also, what would be the best spot to connect my GND lead to?
http://www.youtube.com/watch?v=JgsUpRdgsp8
Ok, I know my converter will put out up to 50w (12v/4.2A), but wasn't sure if the LED would control current on its own. I assume it is, but wanted to make sure.