For a real “disaster kit” light that might sit around for years without even being looked at, don’t even think of using alkaleaks. They’ll be a pile of salt if left outside the light, or will have taken the light right along with it if left inside.

Get a light that can take 1 or 2 CR123As. Think a Jet-II can run off a single ’123, and the MH20, SP32Av2 can take a pair of ’123s. And keep a box of ’123s so you won’t have to scrounge around.

Lotta people want to stick with alkaleaks like AAs because you’d likely to still find ’em when the SHTF, or after the Zombie Apocalypse. Hell, get a trio of AAs to dump their charge to a 16340 instead.