SureFire high quality 123-type lithium batteries shelf life 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.