I would really appriciate if somone explained this to me. I want to know how long Cr123a batts are supposed to last, what charger they are supposed to go in, and if they are pretty much the same thing as 16350's. I ahve had a problem with a vendor who sent me all DOA batts.. SO I ordered from COV, and I love his site, and everything else, (like cartos) came perfect. But the Cr123's a 3.0v,s are not lasting long at all. One even died after an hour of use. Would this happen with a new battery? What are the best batteries, long lasting batteries? I am just so fed up with failing at batteries. I would like to know the best battery for 18650, and 16350's or rca123's, and the best vendor to get them from. How long are they supposed to last, and what there max and lowest charge volts are. What charger's they are compatable with, and if there is just one charger that can charge all different batteries. I know this is a lot to ask, I am just tired of it and would love if somone could help me out here. Any advice would be VERY MUCH appriciated.. 