Cell phones are very similar to 18650s.

I would be willing to put money on most failures of 18650s are not over discharging them, and is short circuits or trying to drive them too hard (pull 20a on a cell only good for 5).

Many name brand lights have LVC (low voltage cutoff), and will keep the cell from being over discharged. Many protected cells also offer LVC, and over current protection.

I would have no problem giving any adult in my family an Olight with magnetic charger.