Note, the Everyready lithium AAA (L92)s *are* now available, but they have *just* come out.  Check out 
this  thread on CPF. 
Runtime graphs are just starting to come in, but it's lookin good!  Check out this one by 
this_is_nascar  of the Arc AAA with lithium vs alkaline batteries: 
 For an emergency kit, the Arc AAA + the Energizer lithium L92 seems pretty decent, esp when you factor in the shelf life and ability to operate in bad tempatures.
-john