Review on Reliable Power Supply: SureFire 6-Pack 123A Lithium Batteries by Jessica Gibson

They work great in my streamlight tac light. I dont like the fact that they arnt rechargeable since I work night shift I need to use my like all the time. Since I work in a lighted shop I use it not all the time but i use it a lot of the time and they usually last around a week with off and on constant use before dieing. If you are going to use it constantly I would get rechargeable will save you money but these are great for a every now and then flashlight.