Thanks for the tip, Dodge.
Followed your instructions… and used what I have for testing some micro-USB cables that I could get my hands on.
I don’t have a really good charger/adapter (nor a real stable power supply), so I just made do with 2 chargers/adapters: an older genuine Samsung adapter ETA-U90JWS (came with Galaxy Tab 3 7.0 SM-T210), and also a TronSmart W3PTA that I bought recently (this is a 3-port with QC3.0 charger/adapter, I used the “VoltIQ” middle port for the tests).
I have a USB adjustable load tester like yours in the video, I think mine is a newer revision (not necessarily better) since there’s some slight differences (of the ports placement) but basically the same functions. (My guess is yours is adjustable load 0-3.5A, whereas the one I have is 0.1-4.5A adjustable load — the new revision’s minimum load is 0.1A, unlike the older one which I think [not sure] can be 0.0A?)
And here’s some preliminary data table:
The short cables, I measured (flat microUSB cable that came with the MI PLM05ZM power bank, and also another short microUSB cable that came with APC M5 power bank; another short cable was labeled 15cm, but I decided to actually measure it to be 23cm); the rest I didn’t measure actual cable length and just used what it was labeled…
Voltage output of the Samsung adapter isn’t always the same, when I directly connected the load tester, it formerly measured 5.44v @ 2.00A (load tester’s built-in display), but later it was 5.41v @ 2.00A — I used the 5.41v for computation. Similarly, sometimes the cable’s voltage also shifted a bit (eg. the Anker Powerline+ was 4.95v but I measured 4.98v another time, I used 4.95v for computation).
Using 2 different adapters yielded 2 different resistance measurements (my ‘equipment’ is not that accurate) but they do appear to correlate…
By and large, the Anker Powerline+ cable is really a notch better than the rest of the cables.
However, the JianHan cables occupied both 2nd best while another model placed last (both models were described by the manufacturer as using 22AWG for the power line) in my testing…
(the AWG rating were based on the description when I acquired them, so I can’t be sure if it’s really correct or not)
~
I wonder what determines if a cable supports “Qualcomm QuickCharge” protocol support?
All the above cables supported 12v Quick Charging (tested all of them TronSmart W3PTA QC3 port => Mi 2 PLM05ZM power bank), except only the APC M5 cable which does not - it just supports 5v charging.