Are you sure about the scale of the measurements? Seems like pretty high cell resistances if you're measuring whole ohms or tens or more ohms of resistance per cell.
I don't think I could live with a typically sized pack of cells that bad, the voltage sag and wasted power would be impossible to deal with; I'd have to overbuild the packs by a couple of factors of ten to get decent performance.
The EIG C020 cells I use are rated at something like <3milliohm each, so my entire 14s2p pack resistance would be only about 21milliohm for new cells (which mine are far from). I think the Cycle Analyst v3 I'm using estimates around 45milliohm for the pack (but I don't have test equipment to verify this), and I expect that also includes the resistance of my cabling, shunt, battery disconnect, breaker, and connectors, but I also don't know that either.
A quick google of 18650 cells shows a wide-ish range of values but generally seem to be in the range of 50-100milliohm each. A similar 14s2p pack of those would then be 700milliohm, assuming that 100milliohm per cell value. A more realistic 14s 4p or even 8p would be half or 1/4 of that resistance, so 350 or 175 milliohm. (not counting interconnects/etc, just cells).
An image from Lgyte.dk for a bunch of different cells:
https://lygte-info.dk/pic/Batteries2012/common/Ri.png
SOmething else to note: The number of decimal places of a measurement's resolution depends on the selected range. If you have a 2-decimal place resolution measurement and are set to ohms, you can read differences down to the tens of milliohms. If you are set to milliohms, you can read differences down to the tens of microohms, sometimes single microohms. If in the a 200ohm range, it can only read down to single ohms at best. (each meter should have documentation on it's specific limitations in each range for accuracy and precision, and how much resolution to expect, which can increase the lower the range is set to).
A useful page
https://www.fluke.com/en-us/learn/blog/digital-multimeters/accuracy-precision
eMark said:
When building an 1865 or 2170 grade AA powerpack one would think an IR tolerance of just 1.0Ω would be sufficient. In other words the umteen cells are all within +- 0.5Ω of each other. Are you inferring a 72V DIY powerpack of umteen AA cells are all within 0.5Ω (500mΩ) of each other not to mention within 0.05Ω (50mΩ) as possible.
With your high quality standard (4th decimal place) what % out of original umteen cells in your DIY 1865 or 2170 were within even 500mΩ (1 decimal place) of each other, let alone within 50mΩ (2 decimal places) of each other? Can even the best 2170 TESLA cells have that tight of an IR tolerance within 50mΩ (2 decimal places) of each other ?
This begs the question what brand cells (e.g. Samsung, Sony/Murata, Molicell, Panasonic) do you consider capable of achieving your benchmark of such tight IR tolerance? I ask this because more than once you have inferred that cylindrical cells are junk in comparison to your VOLT pouch cells. Are you in affect saying that the quality of todays 1865 & 2170 best grade A cells are or aren't capable of such tight IR mΩ tolerances (to second or even third decimal place) in an antomotive A grade manufacturing run?
Take it jj's standard is for DIY builds using salvaged cells costing no more than $2 (at most). Will need 65 good enuf cells for a 13s5p build with IR tolerance between say ... 35Ω to 45Ω. So buy 100 assuming 35 are over 45Ω, and you may need to extend the IR range from 40Ω to 50Ω for 65 good enuf cells.
When building a battery from salvaged cells IR to the nearest Ω isn't possible. An IR range of 5Ω (i.e. 30Ω to 35Ω), as was the case with the thirty Samsung 33G unused cells from BatteryHookup at $2. So far no need to bottom balance as all thirty cells (10s3p) are within 5mV of each other after charging (41.0V), and after discharge (35.0V). Only ten c/d cycles so far with my experimental 10s3p 33G. All 30 cells from same manufacturing run ... https://batteryhookup.com/products/30-100-new-samsung-inr18650-33g-3150mah-18650-cells ... time will tell, but so far everything looks favorable going forward.