Minimum battery is AAA, I reckin' . Least if you ain' t countin' them itty bitty things they put in watches an' hearin' aids. I like AA flashlights fer huntin' . The Duracells last longer than the Evereadys, or so it seems. I keep mine in the refrigerator, but I ain' t sure it makes ' em last any longer. Ain' t heard of a rifle thet takes a battery, but I' m sure they got ' em. Seems to me if people worried more ' bout learnin' ' bout game an' less ' bout gadgets.......well, who knows?