[Update]Wurkkos dual LEDs 21700 Headlamp design Photos/UI update~

Thanks for your input Tom

Looks like Wurkkos has pulled the HD20 until some things are fixed. Already a negative on Amazon about issues with the powerbank feature.

Can someone explain why manufacturers don’t carry out thorough testing before selling the product? Why do we have to become the testers? In my opinion they should make around 10pcs and send them to testers if they aren’t going to do it themselves. Get the feedback, correct any issues and then release it.

Huh you’re right! It’s gone from their Aliexpress store :open_mouth:

Yeah I agree about testing, one of the reasons the lights are cheaper maybe? But then again it should be an easy fix, I don’t think the cost of shipping a few lights beforehand is bigger than dealing with returns/customer problems…

I agree, but I'm sure there's a great priority given to time to market and a fairly large pre-production run costs money and time. This issue has come up many times on BLF before. Even though new lights seem to take many months to launch, a pre-production run would add months. You also need a really good technical multi-lingual coordinator on the manufacturer's side - communication has been difficult and challenging on pretty much every BLF project we've done here.

I think these bugs are relatively minor. Just having true USB-C charging capability seems rare still, and this light can do that.

I think there is 1 actual bug, maybe 2, in the firmware, and also USB-C power bank not working. The rest is documentation.

Any complaints about iPhones don’t count. Type C is complicated. If I have two of these flashlights, one is at 3.4 volts and the other is at 3.9 volts and I plug them in with a c to c cable can anyone tell me what will happen or what should happen? The same thing with other devices that are C in and out. So don’t expect all power bank issues to be resolved. You want it fast, inexpensive and perfect? The buying season is upon us, they had some deadlines. As far as picking a magical number of testers and asking them to not report their findings to the public? Good luck with that. Google comes out with patches and updates once a month. Many people won’t buy the first model year of a new car. When something is new you take your chances.

Just tested - a HD20 will charge an IF25A

yeah but isn’t the IF25A in only? A recent tester noted it wasn’t C to C and it wasn’t a power bank. So maybe he was partly wrong again depending on the power supply. Also what were the voltages and what was the charging rate (at those voltages as of course it will vary)? This power bank feature “sounds” good but I doubt that people are really going to use this in the real world. Again, iPhones don’t count.

Yes - the IF25A is in only. Just proves the power bank feature of the HD20 does work, least on some USB-C connected devices.

The HD20 charges from a USB-C wall adapter (full C), but doesn't work as a power bank to some USB-C devices, most likely the devices that are true USB-C. The IF25A is the typical cheap USB-C, meaning doesn't charge from a USB-C wall adapter.

I don't know how, or maybe don't have the right equipment to measure charge voltage and amps on USB-C. Any suggestions on how to do that?

Ok, I'm ordering this: https://www.amazon.com/gp/product/B07X3HST7V/ref=ox_sc_act_title_1?smid=A3G9TPEINXPSG9&psc=1

It seems to do volt and amp measurement on just about anything USB for $15 right now.

Good. Everybody should have that type of equipment. The one I have is older and only does USB in and out so I’m going to have to get one that does C both ways also. It’s invaluable to be able to look at phone charging issues battery charging issues all around.

A USB QC/PD diagnostics adapter is also a very helpful device. Shows you the negotiated parameters and some also allows you to change them.

Not getting any google hits on that. Do you have any examples to buy?

The YZXStudio ZY1280 for example.

[quote=Tom E]

The 130g weight spec’d is the the flashlight and head strap together, no battery. I don’t know why they did this, but it’s the only thing that makes sense.

The actual weight of the HD20 with no battery, no clip is 87g, not 130g.

Thank you, we will check and modify the manual

We are testing more and improving the reverse charging function, the first batch, no problem for charge flashlights, huawei phone, MI phone ,ect

Here: On Banggood at $66 US. Even at a good price, it's pricey.

HKJ review here - he likes it!

Not available on Amazon.

Good to hear. We noticed it's showing no stock on the Ali store and Amazon now.

lux-Perpetua should have the full summary of manual changes for the UI, and list of bugs.

Hey Wurkkos. I ordered the HD20 with the battery and it seems to have a flashing red during a 90 minute charge. The charge indicator never turned green. Via the manual it says the battery is critical so I tried swapping it out with another battery and the problem was not resolved. I ordered the light off AliExpress on 11.11.20. Any advice on this issue would be appreciated. Thanks.

During charging the indicator blinks red and switches to constant green when finished. Charging can take up to three or four hours.

My FC11 is a solid red when charging. I looked around and found info regarding the below. I don’t think my battery would still be below 3% after a hour charge. Also the other batteries tested were running well in other flashlights.

3% > Flashing Red
30% > Constant Red > 3%
Constant Green > 30%

Per this manual: https://drive.google.com/drive/folders/1MibSgwWIBUqBfb6VgZSPhusiyT7ZE_yH
Per these reviews:
[Review] Wurkkos HD20 aka Sofirn HD20 (dual light, 21700, Type-C, magnet, HiCRI, 5000K)
【ツ】Wurkkos HD20 Sales Thread - updated revision and available in green color

That’s the indicator when not charging. While charging it blinks red. Plug it in and wait four hours.

Ok. Thanks. Will give this a try.