Cool! While slightly longer, I found 2/3AAA (10290?) NiMH at Batteryspace. Admittedly I’m not sure why you would want to run them, other than the fact that they aren’t as fussy about overdischarging as li-ion cells.
-Slim
So, you are making a copper body to match the head? Either way, it's tiny and cool looking. I think we should have a modders contest to see how small the smallest light can be made.
Should we put any lumen requirements on that? Maybe 30 lumens for 20 minutes?
Wow. Thats small. Very well done Mr X. You gotta love these small lights as finicky as they are.
I’m out of any comp for a miniature light. :bigsmile:
Yeah, I nailed ChiX! Wait, what? :D
Fun game. Love your lathe skills. :)
very nice! can’t wait to see the copper version, and it in action
Yes sir - copper to come.
This one is 1 5/8", without the lug.
He was busy at work in his shop
with his lathe , hoping nothing would spall
For a flashlight he wanted to chop
and he wanted to make it quite small
As the filings were flying non-stop
sparks were brilliantly tracing their fall
He made sure there was not any slop
With an eye for detail above all
He paused briefly , his forehead to mop
His ideas , his hands would install
When the lathe finally slowed to a stop
His creation would always enthrall
(Wipes tear from eye)
Thanks, Jack. 
Now that’s small. What’s the driver?
It uses the stock Maratac L-M-H driver, although it's almost surely direct-drive on high with the voltage provided by the wee lithium-ion cell.
I don't have the patience or your skills to futz with electronics of this scale. ;)
Won’t the voltage kill that driver at some point or is it more “might kill” than “will kill”?
I run my maratac cu aaa on 10440 batteries, that works alright with a very nice output.
I haven't heard of anyone cooking one yet, but it could happen.
I would be more worried about the tiny cell and the ~10C current draw on High...there is an expectation of reduced cell life in this application.
I checked the Maratac site and they void the warrantee for 3.7V cell. Any chance you could measure the voltage on high to check the sag? Is there any way to acquire one of these drivers without getting a light? .9V-4.2V input 3-mode drivers are hard to find. Maybe ok with 10180 or 10280 but not 10440.
I used this 12mm driver from dx to repair several aaa lights. It does not show on dx, but it actually says tank007 on the back, and strangely enough it is the same driver that sits in the ultrafire a3. They usually do not blow up with 10440's, and are cheap enough to buy 2 just in case. It has the usual low frequency pwm though.