Yea, neither had I, until a couple of years ago, when a friend gave me an LED flashlight that took four of them. They are tiny--probably 1/4" in diameter, and the length of a AAA battery. The bad news is that I DON'T think that they come in rechargeable format...at least I have not found any yet. You might try "Batteries Plus", though...if they don't have them, then, at least your query will let them know there is some interest. Regards Dave Mundt