Some weeks ago, Jelina from Wuben sent me an extension tube for the Wuben T70, so that it can fit 2x26650 batteries.
The tube arrived some days ago, and here are come pics.
Note: I don’t have more 26650 batteries, so I had to test the flashlight with 2x18650s and some tubes inside. Still, it worked !
Thanks for the informative review.
Interesting. I really like 26650 form factor, but I sounds like ramping usage would be frustrating. Keep it in stepped mode.
Thanks 
Yup, I do prefer to use it with the regular modes instead the “ramping”!
It is a pitty as this is a very nice little, that with a slightly improvement in the UI would be a complete winner! Still it is a solid and good working light
I assume it is an E-Switch. Can you measure the parasitic drain in standby?
Yup, it is an e-switch, but I have no instruments to measure parasitic drain 
Sorry
The camo appears to be powder coated, or some sort of spray painted coating, on my T70 camo. It spilled on the inside of the battery tube, and suspicious colored soft fragments around the tube to head threads. I pulled the driver out of mine - oh boy, 3 PCB's, 2 of which are populated with SMD's on both sides. LED wires are tiny - 24 AWG.
To remove the driver, you must de-solder the LED wires, unthread the retaining ring on the switch, and feed the switch into the cavity because the switch wires are too short - knowing that trick it's then easy for the driver assembly to come out.
TomE, I know that a while has passed since your post, but did you take any photo of the driver and the structure of the head?
Would a “normal” driver (lets assume with a different UI) be suitable for this light?
Also, how should I measure the parasitic drain? I have a small multimeter now, but don’t know how to meausure that…
Here are some extra photos of this light 
Yes. Pics to follow in a couple mins - updated now. Guess I didn't post these before, I'll post all I took:
Tail springs:
Driver springs:
I swapped the thin 24 AWG with heavier (think 20 AWG?)
Stock MCPCB all clean:
It's chunkie for sure:
Can't get to my notes right now, but might have gotten a bump from the wire mods - pretty sure that's all I did, plus cleaning up any issues with the MCPCB, MX-4 grease, etc.
A 3 board boost driver - lot of electronics. Notice the R050 and big cap are there twice? Interesting...
For parasitic drain, I have 2 meters capable of doing it. Typical DMM's have a mA or uA setting - for mine you must move the probe connectors - as marked on the DMM. Remove the tailcap and bridge the batt- end to the tube. Be careful though - don't turn the light ON while connected this way - it may blow a fuse, because the low amp measuring mode in the DMM is sensitive to high amps. With my NarsilM lights, I blink the main LED twice on turn ON - that can fry some DMM's. Forgot details but pretty sure it only risks the low amp measuring mode. Some are fixable as well.
Least this is the way I do it - might be other methods.
For the driver, it sure is do-able. The switch is connected off the base board which might work better. A piggyback driver running NarsilM or Anduril could work, but, (big but) you can't run an XHP70 or any 6V LED on the one cell. Maybe a 3V XHP50.2 but LED positioning would have to be worked out, as well as LED height.
TomE, thank you very very much for the detailed photos and the explanations as well! Awesome
That surely is a different driver architecture, but it also seems to show the reliability that Wuben wanted to give to this flashlight! I am no good in electronics, but I noticed the R050 there!
I will check if I can measure the drain, as I am also learning this. But maybe I will try it first in another light with more or less the same specs ( just to check if I know how to do it)!
Hum, about the driver…well, I start to see too many things I don’t know if would be able to do … :person_facepalming:
I thought I’d be able to change the driver only, without piggyback, but that and the LED swap…I may incur into a delicate path for my knowledge.
I need to re-think what I was thinking as this light is “precious” and is serving me well, so I don’t want to ruin it…
Thank you very very much once again for taking the time to post the photos and the explanation! 
:face_with_monocle:
And…that MCPCB is WOW 
Hey there. I was wondering what you would expect the benefits of a second 26650 would be. I’m trying to decide between this and the Wuben A21, and if a second battery option would equate to significantly better runtimes it might be enough to tip the scales. If it increases brightness but doesn’t significantly increase runtime then it probably wouldn’t be worth it.
What do you think?
This looks very cool. Would love to see a side by side with this and a classic 2 D cell maglite.
The 2 x 26650 will of course give you more runtime, even on high! I see me charging it less since I started using the flashlight with the 2 cells.
I am not sure it if will give higher output and I don’t have and exact way to measure it. But runtime will be longer with it
I don’t have that flashlight, maybe some of our other members has and can help with that
Sounds like this might be the direction I should go. I’m getting a little sidetracked by Olight having a Xmas sale tomorrow, but the T70 seems like the direction to go if I want brightness AND runtime. How did you get your extension tube? I don’t see it for sale anywhere. How much did it cost?
Thanks!
This is, at least, a good flaslight if you want some “sustainable lumens” for a while. Currently I am using it with the “stepless dimming” mode activated do that I can turn it ON/OFF with just one click.
About the tube + extra cell , it was sent to me by Jelina from Wuben for review purposes. Maybe you can contact her through the user profile: http://budgetlightforum.com/user/20745
Check if they still have those tubes. BG and GB don’t seem to have it and AliExpress doesn’t have it too as far as I know!
About the UI…Olight will win over this, I am sure! Still the T70 is a great light that I can rely on if I go to the “wilderness” :smiling_imp:
Ordered this camouflage T70 today from Fasttech. I got a great price at $71.95 delivered, using the current 10% off promo code FOOL10.
I am stoked with the Wuben L50S, so I am especially excited to get the T70. Will probably be six to eight weeks due to current shipping situations.
You won’t regret getting this light
Super reliable, one of my most gorgeous lights due to the camo pattern !!
I also became to like using the light in the ramping mode, with a settled output for ON/OFF use. The ramping is not so fast as Anduril, so it may be a bit troublesome using it but with just a defined output it will be a nice light!
Something to reinforce the good option:
Thank you, MascaratumB, for posting those videos.
I’ve had my eye on this one for a while now. When I found out about the Fasttech promo my eyes lit up, I got amped-up, and did the triple click turbo on that order button!
It’s going to feel like forever and a month, waiting for it to arrive.
I don't buy many high end lights, but this one is also one of my favorites. It's quality.
Pure one
Oh, BTW, I already abandoned the idea for changing the driver after seeing your photos some time ago 
If it was designed that way, let it stay in place