That's the down fall, the brighter you get the shorter the battery life. I've got two Surefire's in the G2 and G3 Nitrolon's, I'm totally impressed with them but batteries being an average of 4.00 a piece I don't use them except to track deer. For battery duration I'd go with any of the Mag-lite's, cheap batteries and last alot longer on life. JMHO