I wonder who the manufacturer is of YR1035?
With 4 terminal connection you do not need a connector with low impedance, the usb will work perfectly.
Or for controlling a a sorting device, the YR1030 has functions to sort cells.
HKJ, maybe I just don't understand it well, but in this thread you mentioned that the health of a battery can be determined by monitoring internal impedance such as with a SM8124 meter, but in other threads, I thought you said that measuring internal impedance with a meter such as the SM8124A is only good when first receiving batteries and that only the DC method can measure the true IR as the battery ages? If I understood it correctly and the DC method that chargers use to measure IR are what we should be looking at, then what is the maximum recommended IR of a lithium battery with protection circuits before they would need to be recycled?
Maybe there is no correct answer to my question either as protection circuits add all that extra resistance and from the batteries I have with the same part #, IR has varied greatly as well and left me a little doubtful as to when I should not use them anymore. Right now, the only sane method I trust is if they heat too much whilst charging, then they go to the recycle bin and I'm done with them.
Henrik, do you think that impedance values from the SM8124A can be converted to approximate resistance values, e.g. by using a conversion factor?
The DC method is the best, the variation with AC is not as large.
The problem with chargers is that they all use different test parameters and the results is not completely comparable.
No.
Is there a reasonably priced DC IR meter that is available then?
I only know of hobby charges.
Thanks HKJ!
HKJ, thank you for this article! I now know much better how my SM8124A (pictured below) works.
I've used it extensively and am impressed with the way that IR reading are repeatable - unlike my analyzing chargers. I purchased mine on ebay for around $53 (including shipping), but it it can be found on Ali for about $10 less. See the Found a Quality Battery Resistance Tester thread for more discussion on the SM8124A impedance tester.
Here is table for comparing ACIR and DCIR values for various cells. Cells are new from nkon.
Internal resistance is affected by DOD, see values of new LG MJ1.
Here is link :
Both ACIR and DCIR are sensitive to temperature.
Can you recommend an affordable and reliable hobby charger to measure DC IR of lithium-ion batteries?
I don’t know if this is a ‘gold standard’ for IR but I’ve found it to be significantly more consistent and accurate than any of my analyzing chargers. If you don’t NEED a hobby charger, and are OK with just discharge and IR testing I’ve found this to be good.
ZH-YU ZB106+ v1.3
Note - there are a number of similar testers available with varying prices, power, and cooling options. This one goes from 0.1A > 2.6A. I use and external PC fan to cool it on higher settings.
You’ll need a good cell holder, and a power source. Many charger power bricks will work. Some units are USB powered.
I use this one. There are similar, but it HAS to have the 4-wire capability for IR.
4-Wire Battery Resistance Capacity Test Holder
No, chargers are generally not very good at measure resistance (DC or AC), because there is a significant amount of contact resistance.
Thank you flydiver and HKJ! I just wish there was something available that is ready-to-use out of the box, i.e. 4-wire cell holder, resistor and powersource...all in one kit.
Interesting tester, but I can’t find it on ebay or aliexpress….
EDIT:
Oh, wait, here it is:
https://www.ebay.com/itm/Battery-Capacity-DC-12V-Tester-Lithium-Test-Life-Internal-Resistance-Analyzer-J/193850665224
https://www.aliexpress.com/item/32795334108.html
Both parts 16 USD shipped? Not bad, though not great either. 
I wonder if ZB2L3 is any good, it’s much cheaper.
The Xtar Dragon VP4 Plus will do IR testing, it works well enough for me 
The ZB2L3 is not constant current, using resistors for the job. As the voltage runs down, the amp draw decreases. That will make some difference in the capacity (it will read higher), but I prefer constant current.
Does not appear you can do IR with them. I checked them out as a possible extra cheap dis-charger to have and decided it wasn’t worth it, at least for me.
The EBD-M05 is a nice, affordable battery tester. Does DC IR nicely with the help of its PC software, which among manuals is downloadable from the ZKE website (chinese, translated).
Needs to be paired to a 4-wire battery holder, a couple affordable links to a ZKE holder in AliExpress here and there (like the one linked by flydiver).
I see. No constant current = no good.
Thanks for setting me straight.
It’s really not too hard to use the links, pick out the necessary items, and purchase. We’ve done most of that homework for you.
When you get to this stage you take a step into Do It Yourself. It’s satisfying, as well as educational and useful. My understanding of my batteries took a BIG step up. A bunch of batteries that ‘seemed’ to be OK using capacity only from an analyzing charger got recycled when IR was found to be (very) high, and they would not sustain amp draws that were reasonable, but the analyzing charger could not achieve.