I have used Streamlight 123's for a while now and have always had good results with them. Last weekend I bought 12 for $20 at a local gun show. The Surefire 123's were 12 for $24. I have been told, but have not been able to confirm, that the Streamlight batteries are manufactured by Duracell. I have always been happy with mine. I stock up at gun shows because that's where I find the best deals on them.