There’s a few UT02 review topics floating around but I thought I’d place my question in this one.
While I’m waiting for mine to arrive, can I ask if anyone knows whether the new short version of the Keeppower 26650’s work in this torch?
I’ve got them in my L6 so it’d be handy to use the same batteries
thanks
I tried one of mine very briefly and it worked. The only 26650 that I couldn’t get to work was the Klarus battery that comes with the G20 (button top). I also had trouble with a button top protected Keeppower 18650. Everything else worked, which were flat top or semi-flat tops.
They should work without issue , i don’t have one to test , but it has enough space for batteries .
Thanks
So how about I wait until it arrives then try the ones I have before buying anymore 26650’s
I’ll report back
I just received my UT02, and I like it overall, but I HATE the switch. It works fine, I just don’t like how it feels. Oh well…
Hi, someone who modified resistance for a r100, could you tell me if the modification is still stable? Thank you!
I’ll try and generalize things, correct me if I’m wrong.
If I buy a UT02 now, it will probably only be 2.5 amp at the battery and deliver 40% to 60% below specs. So non modders should steer clear.
The modders can add a R050 to R100 and boost the power back up to stock levels (1300lm)
If this resistor mod causes the drivers to break, the lights can then be used as hosts. An xpl hi and a buck driver can be installed and you can get above spec output (1500lm).
Does this sound about right?
If so, I might get me one just for the heck of it.
The odds are good since this is still below spec.
Now the R050 is the one more likely to cause problems over time.
Has anyone seen the Manker drivers that put out over 5 amps?
I’m wondering if they originally used a R025 sense resistor (which was later swapped to an R050 to reduce output).
They used the same resistors , probably they changed something in the firmware.
Yes, you are correct. Tom’s driver picture is from a Manker. I was thinking it was from the weaker Utorch.
After comparing the battery loads I can see that all modes, besides low, have been shifted down. They no doubt changed the firmware to maintain good spacing. Costs them nothing as well. 
Turbo is 55% less
High is 47% less
Mid 2 is 39% less
Mid 1 is 20% less
How has your light with the added R050 resistor held up? Still working good?
Mine has been modded completely now , running a fet driver (narsil firmware , ldo) and dedomed xp-g2 .
I found where Mitko said he bought 2 of the early Manker lights that drew 5.5 tail amps and they both failed within a month.
I’m guessing the stock driver’s just can’t handle that load. Maybe adding an R100, creating 3.8 tail amps is the way to go?
Maybe it has something to do with these boost drivers pulling more amps as the battery voltage gets lower?
That’s the opposite of most buck drivers.
will these batteries work in this light ?”
Those are protected cells and I don’t see anything there stating where the cut-off protection kicks in, you might run into issues with those as this light can pull close to 6A when a freshly charged cell is used and that will go up as the cell drains due to the regulated style Boost driver. They could also be a bit on the long side, regardless I feel like they’d fail due to the protection circuits.
We tend to shy away from cells ending in “Fire”, they just have a low track record. Try Liion Wholesalers and get some Basen cells or the 4200 Efest, something like that will do fine.
Thorfire is the only good “fire” brand.
I only buy from trusted stores. That way your guaranteed to get what you ordered.
Not necessarily so, Richard suggested I get the non-protected TrustFire 32650 for my TR-J20 and they actually work very well, outperforming anything I’ve seen and this in a 6000mAh 32650. That’s the only “fire” cells I have though, having had too much trouble with others in the past.
Efest, LG, Samsung, Sanyo, Panasonic, Sony, Basen, King Kong, Liitikola, there are a good many good cells out there. No reason to take chances with lesser “cheap” cells.
There has been a lot of discussion about Efest re-wrapping cells. I’ve tested many many cells and have never found a cell from any brand name that has performance characteristics matching the multitude of Efest cells I own. I have hundreds of cells, the highest concentration among these is Efest.
just got my utorch
2.5 amps tail
close to 1100 lumens best i can tell
97,600 lux tested numerous times
built like a brick, could knock somebody out with it no problem 
so im no modder, but do own a solder gun, lol
what can a dummy like me do to amp this thing up a bit ?
and btw, mine steps from a 150 lux ceiling bounce, to about 108 lux after about 4 minutes or so
is this normal ?