Banggood sent me this Fnirsi HRM-10 battery tester to take a look at.
Among other uses, it should come in very handy for sorting out the salvaged lithium batteries I have been collecting.
FNIRSI HRM-10 18650 Battery Voltage Internal Resistance Tester -- https://ban.ggood.vip/1ngsw (some people have reported problems with that link - if it doesn't work try: https://pileofstuff.ca/r/0n48q)
Banggood 20th Anniversary Sale --https://ban.ggood.vip/1niU8
Here's the chart of typical resistance values I showed in the video:
https://www.hanery.com/blog/lipo-battery-internal-resistance/
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#ElectronicsCreators
This isn't the only way to do it.
It's probably not the best way to do it.