I purchased these batteries to go in some led puck lights. Each light takes 3 batteries. I purchased them about 2 weeks ago and installed the lights. This morning the lights were already out, and I had to replace the batteries again. These lights are not in constant use, I'd say only used approximately 4 or 5 hours in the 2 weeks I've had them. The batteries are CRAP, and prove the adage, you get what you pay for.