I'm new at this and have been doing a lot of reading on here lately and I think I have either learned a few things, or just confused myself even more! Anyways, I just bought a Surefire C2 LED and was considering getting rechargeable CR123A to save money in the long run because I have realized that CR123A's can get quite expensive if you're going through alot of em. Any suggestions on the best rechargeables to buy? Or is it best to just sack up and buy CR123A's? What will the difference be in output and runtime between the two? Any input would be greatly appreciated! Thanks!