I have to confess to being something of a flashlight geek. I chalk it up to living in a hurricane zone and being a a hunter and fisherman. I always have a few scattered around the house and in the car. Heck I carry one in my pocket when I go out at night, and will do so always after reading the navy SEAL's report on the Aurora shootings. (He mentioned that a tac light in the eyes would blind someone for a few seconds, which is enough time to flee).
Anywhoo, I was looking for batteries online and found a good site that sells them cheap, Battery Junction.com. However, they also sell LED replacement bulbs for maglights. If you're like me you own at least two mini-mags and a head knocker C or D cell. For $13 you can amp those old neglected flashlights up to 140 lumens. And get this, its supposed to extend batterry life by up to 50%. I am definitely going to give them a shot. They also have replacement tail caps for the mini mags that make them a click on/click off light. This is a huge improvement. Currently they are having a large sale
($1 a pop on 123As, though they are a no name brand, but still, how bad can they be?) so I would browse them now.
FQ13
PS I got educated on lithium batteries. Don't buy the cheapos for high drain functions like tac lights. Stick to surefire, duracell, energizer and panasonic (I'm assuming rayovac counts since panasonic makes their batteries, but who knows?). Anyway the cheapos are meant for things like cameras and can short and burn in high drain devices. Spend the extra cash. My .02.
http://www.batteryjunction.com/maledre.html