Advantec UK Ltd are a company that produce several solutions that may well be of interest to Airsofters. It’s well known that CR123a batteries are not the cheapest items to buy, and both torches and laser units tend to eat through a fully charged cells alarmingly fast. The good news is that Advantec supply rechargeable lithium-ion replacements for the CR123a 600mAh format (and CR2 cells) that can be recharged up to 500 times. The CR123A recharging pack can also be operated from a DC 12V supply such as that found in a car which is dead handy when out in the field.
Perhaps not as interesting but they also supply batteries/chargers for most major brands of digital camera, and some decent looking professional AA rechargeable sets (suitable for anything that runs on AA cells). The AA packs are 2300mAh in capacity and again can be charged via the supplied car or mains adapter. Please note, they have contact email addresses for both end users, bulk buyers and corporate accounts.