What is MINIMUN voltage for 18650 batteries to be called "DEAD"?
A protection IC should disconnect battery once you hit 3v. It's not good idea to discharge below 3v.
With a proper charger IC, those batteries have a good chance of being recovered. Good charger ICs have a pre-charge stage where they trickle charge with very little current until the battery goes up to around 3v, then it switches to higher current charging.
For example, even a cheap half dollar linear charger ic MCP73831 has pre-charge, see page 13 in datasheet : https://ww1.microchip.com/downloads/en/DeviceDoc/MCP73831-Family-Data-Sheet-DS20001984H.pdf
You can buy these chips in various max voltage thresholds, you would want 4.2v as that's the most common. May want to use 4.1v only if you want to extend the life of batteries by not charging them at 100%.
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