These cells should not be charged at all. It would be dangerous. It’s not a good idea to advise a brand new BLF member to charge low voltage cells. Danstorm’s cells are at 0.0v (0.005-0.025v). You can’t get any worse.
See HKJ’s thread: How far can LiIon be discharged?
Depending on the source of information and the particular chemistry of the cell you can see some lower recommendations.
But of course, at 0.0v for Danstorm’s cells, everything says Do Not Charge.