They'll probably work. I have some DX lithium 1.5v trustfires that fit nicely.
Eneloops are great in the Zebralight. They do cut off sharply at the end of regulation (however, in a pinch you could force it to run in low mode).
I have some AW 14500 that do fit, however, they are a touch long and compress the hell outa the inside of the light so given there's no increase in brightness (iirc) I don't ever use them in the H501.
But eneloops in there now and always, it's the free lumens right?