If you want to use a light with AA batteries I suggest getting a 4 pack of Ikea Ladda 1.2V 2450 mah batteries that are made in Japan, not China, that only cost $9 for the 4 pack. They also have them in the AAA size as well. These batteries are actually better, by a wide margin, over the Eneloop's, I have both brands, the Eneloop is not lasting as long in the number of charges that it can take vs the Ladda before they error out on the charger; the Ladda keeps my headlight burning longer by about 20 to 30 minutes per charge. As my Eneloop's begin to fail I'm replacing them with the Ladda's, and the Ladda's are a lot cheaper than the Eneloop's.

Buy those Ladda batteries on the Ikea site, they cost more on Amazon!