Utorch UT01, Known 14500 Issue - Has anyone fixed it permanently?

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duvallite
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Utorch UT01, Known 14500 Issue - Has anyone fixed it permanently?

I have 2 of the UT01 lights, and both have the known issue where if you are using a 14500 cell, you need to unscrew the tailcap to break the circuit in order to turn the light back on. I really like the size, UI, and performance of these little lights, but I’d really like them to work as intended with a 14500, without having to do the unscrew the tailcap thing. I don’t know if this is a switch or a driver problem, or maybe both, but I’m wondering if anyone that has had the same problem has successfully fixed theirs, and if so, how?

Klotski
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Bump
The first one I bought worked for 2-3 days then the same problem showed up, bought a second one and it has been working fine for the last month, I also really like these lights and they would make a great light to gift if they could get them to work right.

kramer5150
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There was another member who did a complete tear down on his light and was able to buy a bunch of switches and fix the problem. His findings were the microprocessor and software are collectively very sensitive to switch tolerances.

Tumbleweed48
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I have 4 of them working fine, but I’ve only been using Eneloops and lithium primaries – and I’ve clipped the outer tail cap springs in all of them.

Have you clipped the springs or otherwise addressed the ‘short tube / crushed driver’ issue, or is it definitely a voltage issue?

duvallite
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Both of mine work perfectly when using Eneloops, and I haven’t tried Lithium primaries since I don’t have any. When I got my first UT01, I clipped the spring on it before I ever put the first battery in it, just so I wouldn’t possibly crush the driver. It didn’t make any difference when using a 14500, still had to break the circuit to turn it back on. Haven’t clipped the spring on my 2nd one. I had sent a PM a while back to the member who did the successful switch replacement (Lexel?) to try and get some feedback and info, but never got a response Sad

If anyone knows the correct switch part number and where to get them, let me know and I might give that a try. Otherwise, I still REALLY like these little lights even when using Eneloops. If I had known about the “basically the same” Lumintop EDC05 at the time, I probably would have gotten that instead only because it has the magnet in the tailcap. Really handy to have that feature, just like my OTR M3 and my Olight S30 Baton have.

kramer5150
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Yeah I think it may have been Lexel (??)… AFIAK he is the only member to have permanently fixed this problem. Somewhere on BLF is a lengthy technical discussion on it. Most of the theories behind this are way beyond my scope of understanding.

joechina
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Tom E did also a repair:
First post http://budgetlightforum.com/comment/1060319#comment-1060319 folgend
- LED + leads AWG 24 changed, solder on contact ring , NO-OX-ID
- MCPCB is Aluminium 0.95mm thick, replaced by a Noctigon (reworked it) LED changed: XPL2 with 4000k

- Overview: http://budgetlightforum.com/comment/1060910#comment-1060910

Joe

duvallite
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Heard back from Lexel, and the new switch that he used is available at digikey. He recommends using hot air for soldering it. Since I don’t have a hot air system for soldering, I may wait a while to try replacing the switch.

https://www.digikey.de/product-detail/de/e-switch/TL3340AF160QG/EG4627CT...

interval
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Hello
Someone knows if utorch ut01 manufacturers solved the problem in the factory.
the units that are bought now are fine?
a greeting

pennzy
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Good question. Seems no one knows yet. Maybe no one is buying it at the higher price.

Jerommel
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Hmm.. Maybe that’s why they WERE cheaper…

moderator007
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pennzy wrote:
Good question. Seems no one knows yet. Maybe no one is buying it at the higher price.

Yeah, that’s my reason. Really hoping around Thanksgiving or Christmas we might see the $10 deal again.
nquinn
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I don’t know why people keep buying these things. Seem to have a huge failure rate.

Pete7874
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Quote:
I have 2 of the UT01 lights, and both have the known issue where if you are using a 14500 cell, you need to unscrew the tailcap to break the circuit in order to turn the light back on.
One of my UT01 lights does this on both 14500 as well as NiMH cells. Sucks. It was fine for the first 6 months.
pennzy
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How long ago did you buy them? One of the sale models?

eas
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I had one little used UT01, and one unused UT01 that worked fine with 14500. I put high CRI emitters in them and started using them more. They were fine, then after a week or so, the one I used most developed the problem, so I switched to the second one, which also worked fine for about a week, and then also developed the problem.

They still work on NiMH, and I’m still using them, but I’m never buying another, and don’t suggest anyone else does, either.

Pete7874
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pennzy wrote:
How long ago did you buy them? One of the sale models?

Yup, it was one of those $10 sale models, purchased in November of last year.

The other one I bought also for $10, in October of last year, still works fine.

toddcshoe
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I fixed it. Found a great way.

download

"Everywhere I go, there I am"

interval
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Big Smile
Pete7874
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toddcshoe wrote:
I fixed it. Found a great way.

download


Ahh… the “bang good” tool… I’ve gotta get me one of these.
pennzy
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Pete7874 wrote:
toddcshoe wrote:
I fixed it. Found a great way.

download


Ahh… the “bang good” tool… I’ve gotta get me one of these.

Made me laugh. Thumbs Up

Muto
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interval wrote:
Hello Someone knows if utorch ut01 manufacturers solved the problem in the factory. the units that are bought now are fine? a greeting

My perception over the last 5 years is the Chinaman does not run new batches for problems like this unless;

1. They are red hot sellers and the manufacturer needs to run another batch anyway and they can label it 2.0 etc. as a new/better version
or
2. They get sooo many returns/chargebacks that they are Forced to fix the issue.

Usually they just come out with a new model and pretend the old problems never existed or were not as bad as some people said.
We are dealing with a low cost flashlight in this case, not a $600 smartphone which may catch on fire so the pressure is just not there for a budget brand to do anything about glitches.

That said I have 3 of them, 2 work great the other is the freak. At least they all do work and function, they are just a PITA when you just want to click and go.
Would not buy another now, but the light does have nice features and killer output.
Later,

Keith

“History doesn’t repeat itself, but it sometimes rhymes,” Mark Twain

After the Apocalypse there will be only 2 things left alive, Cockroaches and Keith Richards
..

Big Sky Country

Tumbleweed48
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Out of the four I bought, three still work perfectly while one needs the ‘break-the-circuit-at-the-tailcap’ treatment.

The ‘faulty’ one has become my EDC, as I always lock out my pocket light anyway. The UT-01 is still my all time favourite 1xAA light despite the odd one being quirky.

At ten bucks apiece, I still feel like I stole ‘em!

wahoowad
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UT01 fan here. Mine purchased Feb. 2017 from Gearbest never displays this 14500 cell issue. I run it with 14500 and AA and no issues.