No, I used alkaline batteries. Seems something have corroded. Me & my wife have 1 each, and if I switch the led assy, only one works. None of the shops in Chalong could help, not even with a mount for my backup lights. (I have a DRIS 1K stubby, and a Big Blue 250 lumens). Also tried to get some aluminium band for a DIY, but need a wider band for that....
---------- Post added January 7th, 2015 at 02:17 PM ----------
Update, fixed! I opened and disassembled the LED assy, and found a wee bit of corrosion which I scratched away with a screwdriver. Also found a soldered pin one one of the sides, and made sure it made contact deeper down (could see a small hole/bit of solder there). Tried it out, and voila! It's working again, Assembled the unit, and out a little more silicon on the O-ring, so , ready to go again!
Did not seem to be much but a driver circuit on the circuit board, so I just had to try..

---------- Post added January 7th, 2015 at 02:18 PM ----------
Sorry for typos, T9 errors...