If the cell is actually genuine (no guarantee about that) then it should follow the datasheet. Note that genuine and unmodified 18650 cells are not generally sold through legitimate distributors such as Digikey or Avnet, probably for liability reasons.
Most of the ones you see with unknown brand names (anything with 'fire' in it, IME) will have a fraction to a small fraction of the claimed capacity. Maybe 1000mAh rather than 4000 or 6000 or whatever they are claiming this week. The crap ones will be significantly lighter than the genuine cells, and probably made with inferior materials internally. If you're lucky (and they claim protection) they'll have short-circuit protection polyswitches to reduce the chances of drama. Undervoltage protection is also possible, but less common.
Many of the folks selling these online on eBay, Aliexpress etc. are shady criminals to begin with in that they're lying about the contents of the package and dropping it in airmail. Extremely dangerous practice.
There are websites (probably flashlight related) that do some testing and you will have a better chance if you follow their recommendations. You can also find some cells with protective circuits added from distribution.