The S1R use a unique IMR battery with the positive and negative on the same end, to work with the magnetic charger. Its a convenient package, but, Im not very comfortable with the exposed charge ring on the tailcap…
otoh, if you want to use the light to start fires, here is how to do it:
Also that IMR battery is UNProtected, so, BAD idea to use it in any of the S1 Mini or S Mini, that lack the protection circuit built into the S1R. I gave my S1R to one of my adult children as a house light. I did not want to keep it around, due to the non standard battery.