This is a box of six SureFire SF123A batteries. As a commitment to their customers and products, SureFire sells its own brand of high quality 123-type lithium batteries. The shelf life of these batteries is outstanding; after 10 years they still retain about 70 percent of their power.
Reviewed by 2 customers
I use these batteries in a Surefire Z-3 Combat light and several others. They are generally good batteries but occasionally, and unexpectedly, one will die before the others in the flashlight, rendering the light useless at inopportune moments.
I like these batteries in general, but occasionally one of them drops in voltage more than the others and it unexpectedly kills the light in which they are being used.