Review request for HKJ [USB Power Devices]

I do have a couple of power banks in queue, I may even drop some of them because they are getting a bit old.
I have bought one of these and hope I get it tested.

Sorry, I cannot do better, but I usual buy a bit more than I have time to test/review. :blush:

AliExpress, $US 4.88
Scary cheap

How about the strange shaped usb power monitor.

https://www.banggood.com/JUWEI-2-in-1-Type-c-USB-Tester-Multifutional-USB-Detector-Voltmeter-Ammeter-p-1163538.html?utm_design=78&utm_source=emarsys&utm_medium=Mail_mid118_email&utm_campaign=newsletter-emarsys&utm_content=Winna&sc_src=email_2445670&sc_eh=6cf43eaa85e5a5841&sc_llid=157724&sc_lid=97625555&sc_uid=QLKeQnxox6

John.

I have ordered the above two devices.
The usb supply will be reviewed, but at that price the most likely outcome is a couple of skulls . I hope the result will be better, but I doubt it.
I hope to get enough time to test the tester, it looks interesting.

Linking is hopeless, either I do raw html or I get errors or I answer my own posts, It looks like the above link works.

The problem is special characters like space, it is sometimes %20 and sometimes just a space, when doing links this often ends up in a non working result.

When doing raw html (Like in my reviews) there is no problem, but the editor tries to be smart and this do not work well together with me :smiley:

http://www.gearbest.com/nillkin-adapter-_gear/

http://nillkin.org/accessories/chargers/

Asked GearBest staff about this strange “Nillkin Travel Power Adapter Dock”, as in the advertisement “Support 2.0A Quick Charge” is claimed.

Synopsis:

Weird.

If it is this one you mean: http://www.gearbest.com/chargers-cables/pp_630687.html
It looks like the quick charge is only a reference to 2A current capabilities, not to any QC standard.

More Liitokala cheap chargers for review :slight_smile:

Qidian QD188.

8x18650 power bank with adjustable dc out. Does not come with batteries. The construction looks cheap as hell, but I’m interested how would it fare in your tests.

Or would it be too similar to the 6x18650 Qidian you tested earlier?

interested too... and i was about to provide the same link on aliexpress, but than i saw maukka had already provided everything

Got it today. First impressions are good. With 4x NCR18650B I got 40.5 Wh out of the DC output at 12V / 2A. That’s about 90% efficiency.

Oh... Lol... So you didn't wait his review...

I know you have quite an impressive equipment for testing color rendering, but I do not remember if you have an oscilloscope... Maybe yes, I recall some rigor stuff,too lazy now.... Sorry...

I was curious about the Vripple, on load, V drop etc...

Voltage drop

USB1
No load: 5.32V
0.5A: 5.26V
1.0A: 5.20V
1.5A: 5.16V
2.0A: 5.11V
2.5A: 5.07V
Shuts off above 2.7A

USB2
No load: 5.27V
0.5A: 5.16V
1.0A: 5.09V
1.5A: 5.04V
2.0A: 5.00V
Shuts off above 2.4A

DC 12V (voltage measured after bundled cable at a dc-adapter)
No load: 12.09V
0.5A: 12.02V
1.0A: 11.96V
2.0A: 11.84V
3.0A: 11.71V

DC 5V
No load: 5.09V
0.5A: 5.03V
1.0A: 4.94V
2.0A: 4.79V
3.0A: 4.65V

Couple pictures from the inside:

Nice THANK YOU. I see you were able the push out 35W at ~12V... Nice there.

I wonder how close can it get to The "Chinese specs" that claim 60W @12V? 80W @16V

And between 88 and 89.7W theoretically for the other voltages.... Hmm... Seems an impressive piece of kit.

Also did you manage to test other random custom voltages at no load or at load?

P. S. ... Nevermind , Sorry This post became strange asking too much... Don't worry thanks for the thorough infos you already provided.

Could have probably done more than 35W, but didn’t want to push it with just 4 batteries.

Hello HKJ, this Charger looks interesting and has 6x 2.4A:
BlitzWolf 50W Smart 6-Port High Speed Desktop USB Charger With Power3S Tech For iPhone iPad Samsung | BlitzWolf.com
BlitzWolf Electronics Store - Smart Home, Audio, Projector
https://www.banggood.com/BlitzWolf-BW-S4-50W-Smart-6-Port-High-Speed-Desktop-USB-Charger-For-iPhone-iPad-Samsung-p-1020794.html

I put in 4x Panasonic NCR18650B and 4x LG F1L after I tested that they had pretty much identical internal resistance and capacity. The power bank is configured in 4S4P and I inserted one Panasonic and one LG to each parallel pair so at least every series component was as close to identical as possible with this mixed set.

After successfully charging a Macbook Pro at 30-60 watts for about an hour and output about 41Wh (measured with a PortaPow), I tested the voltages of the individual cells as:

1S
1P 3.755 V (F1L)
2P 3.755 V (18650B)
2S
3.751 V
3.752 V
3S
3.753 V
3.753 V
4S
3.752 V
3.752 V

Thank you! they are well matched. Nice

Cells properly connected in parallel auto-balance automatically. In fact, you can combine different cells in each parallel array successfully:

The smaller cells are 10+C rated vs the 50As at 4C. This means the smaller cells will only provide 10 - 12% of the torque during a long sustained load, but provide more than 25% extra cold start torque, which is quite good for a low gear ratio drill mostly used to behead bolts (LoL!).

Trounces stuff with 10mm bits, tested. ;-)

There’s two USB ports on the thing. For reference, on the Omnicharge (similar adjustable power bank) I measured 126 mVp-p and 22 mVrms from its USB ports at 1A. On the QD188 USB1-port I got 310/90 mV, USB2-port was ridiculously bad at 1800/410 mV (yep, that’s 1.8 volts peak to peak). Not much difference between 1 and 2 amp load.

I don’t have a very good cable setup for measuring ripple from the dc out, but at 12V/1A the QD188 was about the same as the Omnicharge at 356 mVp-p and 106 mVrms.

edit: disclaimer, the batteries on the QD188 were almost empty when I did the test
edit2: was able to bring down the noise a bit on the QD188 USB2 (1800mV to 800 mV) by using a different usb power bank to power the ZL1100 load. Should probably use a resistor instead to eliminate all other possible source of noise.