I didn't mention this above and it's not easy to imagine from reading the dimensions: The Fenix LD15 is substantially smaller than the LD10, even though both are AA flashlights. When I first got my LD10, I thought it was quite small. I never imagined a high performing AA flashlight could get much smaller, until I got the LD15. If anybody cares, I can take a pic of the LD15, the LD10, and the E01 next to each other.