I don't have any 18650's nor a charger. Ditto for the 14500's except for a pair of the Safts. I have my eye on a JETBeam that runs on a single 14500. Eventually I'll probably have to delve into the rechargeables but I prefer regular CR123A lithium primaries for reliability, cold weather power and availability.

Still, those look like real flamethrowers!
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“I'd rather have questions that cannot be answered than answers that can't be questioned.” —Richard Feynman