I wiped down the UT02 but left the rest
Okay i added the beam shots but i think its bed time! Been up since 5am and its 10:30 now…
I never added the video but i think most people would have seen it by now lol. Its only like a week late!
Hey Chris, how is your light holding up?
A lot of the early ones (Manker and Utorch) were getting 5 to 6 amps at the tail, but they had a habit of failing, so they adjusted the firmware settings to reduce it to about a 2.5 amp load. Yours seems to be in the middle which is odd.
Yes, the drivers can be modded for more output on turbo, but you have to be careful. There is an R050 sense resistor that can be replaced or added on to. Lights that have 2.5 amp tail readings can add another R050 and get 5 to 6 amps. Adding an R100 will get you 3.5 to 3.8 amps.
Keep in mind the ones with 5 to 6 amps tended to fail a lot. If I were you, I’d leave yours as is. Your already getting more output than the current models.
So let talk about current
My manker u21 trully can pull 5Amp
But that’s because of the boost driver
When loose contact, the voltage drop, the driver has to pull more amp
I measured with my current meter
When lightly pressed the spring. The current went up to over 5Amp, and the harder you pressed the spring, the lower the current, lowest i measured about 3.x Amp
It sounds like you have an early model.
Are you looping a heavy guage wire from battery negative to edge of battery tube and using a clamp meter?
Are you saying the amperage changes depending on how hard you push the battery against the double spring on the positive side?
Yes, i did, a heavy wire(14awg), clamp meter
And that’s what i am talking about
When lightly(almost no) press the battery
And when press harder
(Sorry for bad image, it’s really hard to do both measure and take picture)
Hey mate it’s still good. I scratched the reflector but. I think it needs a little output boost I just bought some XPL and XPG2s from fasttech so I might try one of them inside the UT02 see how it does. It sits in a weird spot in my collection it’s to big to want to grab for some job but not big enough for other jobs. I use the XT12GT more then this.
Wow, that’s interesting. I wonder if the difference is because the light pressure only touches one spring and the heavy pressure touches both?
To decide which amp draw is true, I would have to say the one that duplicates the pressure when the battery cap is tightened down normally.
This means a short battery might cause a higher amp draw than a longer battery because they compress the springs more.
Several regulars here reviewed the early production Manker and Utorch like DB Custom and Tom E and got 5 to 6 amps. Do you think they were not pressing the battery down hard enough to touch both springs?
I believe it’s because of the driver
I read somewhere that the current required by boost driver depends on the input voltage
Pushing it harder against the springs will not change the batteries voltage.
Maybe the springs are low quality and causing a voltage drop to the driver.
Then compressing them so they both touch reduces the voltage drop by half.
It’s odd. Maybe it needs a proper spring bypass on both ends to get consistent amp readings?
That’s what i am talking about
Volt drop on spring makes the driver require more current
That’s what i am talking about
Volt drop on spring makes the driver require more current
So I guess EDSG Chris’s light might measure 5+ amp if he doesn’t press the battery too hard.
I wonder if the early lights reviewed would get about 3.8 if the reviewers pushed harder to engage both springs?
I’m going to pass this information on to them and maybe they can test the theory.
so i found some interesting today
first:
when you press the spring hard(not too hard, normal press to be exact). the current will be about 3,5A, then you slowly reduce your force to spring, the current will slowly goes up to 5.8-6A
but when you press the spring hard again(like how you press at first, and not turn off the light). the current will stay remain, 5.8-6A, strange.
then you switch to low then high again, now the current will be about 3.7A
so
maybe i accidentally active “super turbo mode” 
Copy your last post here:
It is more likely to be seen by those with UT02’s.
What cells are you using? I am using Samsung 25r in it. 18650 won’t push as hard against the springs.
I just woke up and it’s 4am might as well get do some testing of my own nothing else to do at this time. I’ll try some 26650 in the light.
I done the maths before you need around 3+amps to get enough wattage to produce 1300 lumens.
my cell is protected Fenix 26650 4800mah
btw, my manker u21, i’m not sure if it is an early version, because i bought it about just 2-3 months ago
from hkequipment
ps:anyone know where to buy its lens, i accidentally touch the len with my glued finger, now it’s very annoy to look at its len