if you are looking there.. I would stay away from those specialized batteries. I do not know about the one, but while you can get 123 cells at the store, they are -very- expensive for what you get.
I get my flashlights for work from LED Bright Flashlights and Rechargeable Flashlights by LED LENSER
. I carry the "P7" and most people who see it light up for the 1st time remark on how bright it is. They also make larger and brighter lights along with smaller. I chose the P7 because it fits in my beltholster with my multitool