It looks like the disposable Energizer AA are popular, but I wonder about rechargeable Li-ion AAs.
My limited research has found that Panasonic OEM or rebranded cells -- referred to as 18650 -- are giving good results. But these results seem to be for flashlights.
Might they be good for our purposes? They're certainly more expensive. But the lightweight and possibly extended runtime has my interest.
Does anyone run Lithium rechargeable AAs?