Makes me think of those hand guns in the movies that never run out of ammo. I want one of those!I a m sure we have all dream of the hypothical flashlight that never loses power and stays one the turbo brightness indefinity, unless turned off by the user.
Good thing dreams are free
You might enjoy this:Another thing I've thought of conceptually, but don't know if physics would preclude it, would be a flashdark. Basically it does the opposite of a flashlight. It absorbs all ambient light in the beam and plunges things into complete darkness.