Problem solved, battery issue.
With Lii-50A 26650 5000mah is OK.
Mike
Guys, can you help me finding good bicycle mount for that flashlight?
Tia, Mike
Amazon upto 33cm
[2 Pack] Vonpri Flashlight Holder, Mount Bicycle Mounting Bracket Flashlight Holder Torch Clip 360Āŗ Rotation
Thanks Rambo007.
Is there any pic how is led mounted? I wonder if mt-g2 on 20mm noctigon will fit there.
Mike
Well, I could not stand it :smiling_imp:
I cut the Thrunite battery. It pissed me off that with a bigger current it gets so bad and I came to the conclusion that it is probably a security device and not the battery itself. I dumped everything and the battery itself was left. Now itās flying like Lii-50A. At UT-02 I am 6A and TC-20 9.5A. Turbo holds over two minutes and then drops because the temperature reaches 60 degrees Celsius. You have to take into account that the ambient temperature is 30 degrees, very warm ufff. Thatās how the battery lay for me because I do not have any lamp with power consumption below 5A. Now it is flying in the TC-20. 
Great info. My Thrunite battery dimmed turbo after 2s. I will rip it apart 
Mike
I realized that the other night as well. Iām going to rip it apart today.
sp5it, Ednessā¦ How much are your lights dimming in output? (estimate)
With the Thrunite cell mine is down about 100lm at 30 seconds compared to turn on, I didnāt record how soon the drop actually occurred after turn on, but itās not really enough to notice visually. Iām going to do some measurements again when I have time, and also check it with a Lii-50A.
For mine it was dropping out of turbo almost immediately. I thought itās my eyes but when i meausred it with lii50a, lux meter donāt lie.
I just took the battery apart, it no longer drops out of turbo and the number matches with lii50a and efest purple.
my battery has a blue wrapper under the Thrunite wrap.
100 lumen in 30 seconds is just the led heating up and is normal. The other guys are probably getting about 700 to 800 lumen drops (from 8A to 6A at battery).
Mine dropped a lot. Was fine on LII-50a battery. Now is fine on both cells.
Mike
Hey i have a thrunite tc20 and lumen tubeā¦ i tested it shockli imrā¦ 3.98 v at the time of testing.
3164 lumen @ turn on
3087 lumen @ 30 seconds
Newlumen, thatās nearly the same drop in output Iām getting on my TA tube.
Sounds like their cells had a defect in the protection circuit.
I think soā¦ tc20 is very powerful light, and i believe thrunite 26650 couldnt keep upā¦
Shockli imr
3164 lumen @ turn on
3087 lumen @ 30 seconds
Thrunite 26650 stock battery
3269 lumen @ turn on
2702 lumen @ 30 seconds
You can see shockli imr do great jobā¦
Those numbers are really low for a 3800 lumen light. Since the TA tube is reading higher than normal right now I would expect to see it measure about 5800 lumen which could then be adjusted down to around a real 3800 or so.
If your tube is reading 3087 then thatās about 2000 real lumen. That sounds more like High than it does Turbo.
Does this sound correct?
Forgot the numbersā¦ I am using .70 factor just using the stock fenix lightā¦ the point I am trying to show is lumen output between shockli and thrunite batteryā¦
Lumen tube accuracy?? Probably soon.
My numbers are considerably different WITH the Thrunite cell after I cleaned the ends well on the cell itself. The almost immediate drop is now gone and the lumens hold fairly well instead of just a few seconds.
I am not saying my light tube setup is perfect , but it is the same as the ones Dale and TomE have and all 3 of our lumens readings were calibrated the same and tubes made by the same person.
We all get very close to the same lumens readings out of the meters , so I am guessing my meter is pretty accurate?
Anyway here are the charts I made with my TC20 sample.
Unfortunately, I think all three of those spheres were calibrated a bit too high. Maybe ā20% to 30- too high (might be closer to 10 to 15%). They were never tested against a NIST certified reference light in a commercial sphere. I think their calibration was based on guess work in relation to factory rated flashlight specs.
Texas_Ace is trying to get some good accurate data to calibrate the lumen tubes he recently built. Heās working with Maukka, who has a pretty sweet $10k integrating sphere, to figure out a more accurate correction factor.