While I have a couple of Surefires and Streamlights, the light I have been using the most lately is a Mini-mag 3W LED. Same sized body as a regular Mini-mag, with a slightly longer head. Uses two AA's, I have no idea on battery life, I have had it for almost five months, and still using the originals. MSRP of about $25, got it at Wallyworld for $19.95 or so...