Also, only use good-quality cells. If the brand has “fire” in the name, it’s probably not worth buying no matter what the product specs say. Only use cells which have good reviews from reputable reviewers, and only when sourced from reputable shops.
(the only “fire” exception I can think of right now is the WindyFire 14500 cell, which gets good reviews, but that’s irrelevant for this 26650-cell light)