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Yep, correct - the unprotected cells (aka scavenged cells out of laptops etc) are not the usual culprits for the zero voltage gig unless they are coosed. Interesting how many packed battery units...

All cells can do it, I've had to Panasonic 3600mA protected cells arrive in the dead state never to be resurrected again. Replaced no questions asked, and on opening up they appeared fully legit...

Yeah if they are the "protected" type of 18650 they have a circuit on the top that shuts the cell off over something like 4.25v or less than 3.3v from memory. Over the max, the cell will still...