Ever been stuck in the dark with a dead flashlight? I have. What I do recall is having every size and style of battery but the one that the flashlight needed. Panasonic has a new flashlight that will make it almost impossible to be without the right battery. The “Panasonic Any Battery Light will run on any combination of D, C, AA, or AAA. You can fill the Any Battery Light with batteries or run it on just one AAA. Pretty clever.