StorminMatt
Flashlight Enthusiast
Sure, I understand the energy logic. But saying AA is "almost the same size" as 18650 as you did, I can't agree with that, because 18650 occupies more than double the volume of AA. In reality, the size increase (in % volume) from AAA to AA is virtually the same as the size increase from AA to 18650.
I think what he meant is that many AA lights are not much smaller than some 18650 lights. A good examole of this would the the Zebralight SC5 vs SC62/63. There really isn't much difference in size here.