I’m cooking mine now. Can’t get consistent mΩ readings worth a damn, but then again I never could. The Ope isn’t getting heat-stroke — yet — charging and discharging at 1A each (all 4 bays loaded), so I should get some indication by tomorrow.
I typically get a consistent 30xxmAH with 30Qs.
You mean this? That's the only other way the software will display the results.
Currently running a 5A test, will post results when done.
The results are in :)
Yes.
Took a look at HKJ's comparator and unsurprisingly couldn't find any match among famous manufacturer cells. Henrik has not tested all the cells which exist, of course, but given the cost and origin the cell must be manufactured by some decent chinese OEM.
Now what matters is, how good that cell actually is? We'll be waiting for the 5A test, if you are using a 4-wire battery holder the cell's internal resistance will be easily inferred with decent precision by comparing the available V(C) curves.
5 & 3A test posted above ;)
Wellp, it certainly is no high discharge cell (this or your testing setup is terribly flawed). At the 300mA point there's more than 0.3V of difference between the 5A and the 1A curves, it translates in above 75mΩ of internal resistance and this means your setup must not have independent voltage :???: monitoring, and also the cell looks to be of pretty standard 2C discharge rate.
Sun, 10/27/2019 - 23:10
Oh yeah.
Average voltage is too low for a 30Q.
An internal resistance measurement+ a 10A test would seal the deal.
Thanks Barkuti, it's nice learn something new, my load tester is probably not the best ever, but neither are my cells I guess :)
I will try the same tests on my Sofirn 18650's now.
Unfortunately 5A is my little testers max.
I do not have fancy discharge testing gear. For me, I drop a cell into a known light and use a large gauge current loop and voltage monitor and cook the cell in something that draws like mad. Look for sag and current draw response.
What are you talking about?
This is not fancy: Massive post on where to get lithium-ion batteries everywhere in the world! Look at Post 2-5 for info, And Canada Post 123 - #53 by BlueSwordM
What is the active load? Model number. Also, could you post a pic of the homemade cell holder? 3 amps is a good enough test for me. I would like to be able to rate cells when I get them and they every 6 months to a year later do the same test again. I use a few multi-cell serial and parallel lights and would like to match them at something higher than 1 amp.
Just in case anyone was wondering this is what I use :)
https://www.aliexpress.com/item/32614219909.html
&
https://www.aliexpress.com/item/32664964301.html
Would love to know how good it actually is.
Would you mind sharing what tester? I have this 
discharge tester in my wishlist (some feedback here), may buy it some time. But if I can find some cheap graphic rendering device, the better.
Aaah, then you have a 4-wire battery holder. Well, this confirms your “3000mAh” cell is a battery of pretty standard discharge. The following is what likely it is:
Source: https://www.alibaba.com/product-detail/High-Capacity-INR18650-3200mAh-Dlg-3_60805797151.html :-)
Ordered one of these just for the fun of it, looks interesting.
https://www.aliexpress.com/item/4000144172951.html
Think we getting OT here :)
Does their software do English?
Yup :)
Well Dang, but that’s sure a pretty little critter.
I look forward to hearing about how well it works.
Anyone know if the “147”, “151”, etc., is the date code for 30Qs? Ie, the last line, under “SAMSUNG SDI”.
Pain in the ass Opus was getting heat-stroke again, would drop to 0mA, then back up to 1000mA, then stop, then go, etc., that I redid the cap test at 500mA just to get all 4 uninterrupted. Just put on the second group of 4 this morning. 
All finally clocked in in the 2800s, all within like 60mAH but still just a hair under 3000mAH.
Wondering if they may be from a coupla years back and need some “exercise” or whatever to get up to speed.
Damn, I bought six 21700 batteries from this seller https://www.aliexpress.com/item/32846442786.html?spm=a2g0s.9042311.0.0.782c4c4ddz8ljP
It actually looked pretty legit, but I doubt the batteries are. Does anyone know where to get proper batteries with international shipping?
I’m not trusting eBay sellers even though their price seem realistic either.