Also funny to see "and lithiums are 3V" (not mentioning li-ion at all) next to... the 3.7V lions they're selling on the same page.

Fortunately the actual page on li-ion gives 3.6V

Personally I think the safety risks of using li-ion cells like 18650s are a bit overexaggerated -- the torch/"vape" community has been using them in large quantities (in China they are becoming nearly as common as AAs), and there have only been a few notable cases of significant damage. Yes they are not as safe as something like an alkaline but even lead-acid and NiMH/NiCd can source significant amounts of current too.