Does a 1xAA 'torch' even exist? Even a 4 x AA like the Ascent Commuter has 3 levels and on the lowest setting should be just the ticket for 'minimalist' application. $14, and you get a very nice taillight as well. A decent 'pop off' mount as well. Something to find keys with in the dark might have 1 x AA. Any commercial mount for it is going to cost more than the light itself. I would DIY if it were me.