The batteries go by several different numbers: RCR123A, CR123A, 16340, CR16340, and ICR123A but they're all the same batteries. The normal working voltage is 3.6 to 3.7 volt. Some retailers describe them as 3.6 volt and others describe them as 3.7 volt but they're the same batteries.
It's best to stick with proven brands like Ultrafire, Trustfire, and AW.
It's best to stick with proven brands like Ultrafire, Trustfire, and AW.