Okay, basically you can run primary cr123a cells or rcr123's in your light. The main differences are that rcr's have all the obvious benefits of rechargeable cells: Economy, being able to recharge partially depleted cells, environment etc. However, you also get all of the traditional downsides to li-ion cells: Safety, time needed to take care of cells, specific charger etc.
With regards to the light, as RCR123's are a higher voltage than primaries you will get a power boost with them which should up the output of your light from about 200lumens to almost 250. This may seem great to start with, and dont get me wrong, it is! :twothumbs
However, there are problems to it: Firstly it will quite possible void your warranty on the light if you use above the rated voltage, which rcr's will be. Secondly, the additional power going to the led means increased heat buildup, this can reduce the life of your led, if used sparingly in less than 1 or 2 minute bursts it shouldnt have any noticable effect for thousands of hours use still though, so if youre careful it shouldnt be too much of a problem. But I make wouldnt make any guarantees.
A further point is that having chosen the Stainless steel version, the lights heat dispersing properties will be a lot less than the aluminium version, so you should be even more careful with relation to heat buildup from continued use of rcr cells if you choose to go that way.
Oh, and if you do decide to go for rechargeables, definately get AW brand 750mah rcr123's. They aren't quite rated capacity, but are the closest you can get and the best on the market at the moment by far.
