Spent a LOT of time on various flashlight forums looking for a true keychain light, with decent (100+ lumen) output. Most use AAA or CR123 batteries, which make them unsuitable for real keychain everyday carry. The ones that use button cells are good EDC lights, but don't have enough light to be terribly useful and aren't rechargeable.
I love 4Sevens, but the Atom just doesn't comfortably fit in a pocket with keys.
...Check out the specs on the Valeno Designs Quantim D2. Very nice pocket light, with a tritium locator.
