The 510N is a tricky little weird device. I just had a very odd thing happen. I accidentally put the battery(factory kit battery) in upside down, as in the negative side up. It was a complete accident, and when I screwed the top on, the atty was on and wouldn't stop. The light was off however. I was using a regular 510 joye atty.
I then unscrewed the cap thinking there was a malfunction and screwed it back on. The same thing happened. The atty was on full blast, no light and hitting the button did nothing. I unscrewed the cap again and it turned off. I then decided I was going to try a LR atty. I screwed that on and then screwed in the cap, and it worked, though it would not stop.
I then decided that I wanted to try one of the new ultrafire 17670 1800 mAh batteries that I ordered that didn't work with the LR or Dual Coils the first time I tried. This is when I realized that the battery was in upside down. I then turned it around the right way, positive side up, and now my LR and Dual Coils are working with the factory 18670 battery and the new ultrafire 17670 1800 mAh batteries.
Whatever I did must have primed something in the circuit board to enable the factory batteries to power the LR and Dual Coils. though I can't be sure that this thing will blow up in my face now...though there are no odd sounds and its not getting overly hot.
I'd love to find out if this worked for anyone else. I had just ordered a set of the black 17670 1600 mAH batteries that Scott uses in his video at the top of the thread, so now I'll have 6 batteries for this thing. The order shipped like 10 min ago I can cancel it. darn it.