Scorpion Flashlight w/lithium batteries by Streamlight Inc 85001  When you need a serious backup light for an emergency, reach for your Scorpion.  Even if you don't use it for 10 years, its twin lithium batteries can instantly provide up to 6500 candlepower for a full hour.  And its 4.9" machined aluminum case with rubber armored sleeve, O-ring moisture protection and unbreakable polycarbonate lens make it virtually indestructible.  Triple action tailcap switch, spot-to-flood focus and spare xenon bulb are all standard.

Uses two  3V lithium batteries (included) with a shelf life of nearly ten years.    4.9" long