I just ordered a liotec Freedom and in preperation I want to order some extra batteries. I have a surefire M6 as my primary light and I have been using Surefire brand CR123A batteries that I bought for little money a few years ago. After a quick online search I've found different brands of these going anywhere from .95$ all the way up to $9 each. Is there a real difference or is this just more of the same Duracell vs. Energizer crapola. I know the surefires are rated for exceptional shelf life but at 60 minutes run time lets be serious...Im not gonna have the cash to buy 10 years worth at 1 time.