I use these batteries to power my Pelican M6 flashlight. Using 2 regular non-rechargeable CR-123 batteries I can get 1.5 hours or more of run time. With these rechargeable batteries, I am lucky to get 20 minutes of run time to a pair. Since there are enough batteries to switch out twice, it doesn't seem to be to big of a problem. I have however recommended this item to others who use similar flashlights. All in all, good item.