I've recently stubled across a channel called Nerdville - The Nerdville chap has a mountain of 18650 Lithium Ion cells (About ~7000 of them). Having watched his plans for building an automated charging/discharging/measuring solution, I had an idea for a possible way to quickly identify bad cells before the lenghty charge/discharge cycles begin that I thought I'd share.
The milliohm reading this technique gives will be wildly inaccurate due to using the wrong test frequency (100Khz instead of 1Khz), but relative measurements from one battery to another will be consistent.
Негізгі бет Measuring Lithium Ion Battery Internal Resistance (ESR) to quickly identify bad cells.
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