I'm a professional photographer, and I bought these batteries to use in my flashes at weddings. They recycle quickly, but I went through three sets of four batteries at one wedding. If I use eneloop, one set will last the whole day. Even my rechargeable energizer batteries last longer than these. What a waste of money. I would love to return these, but 17th Street Photo doesn't accept returns on batteries. I guess I'll just chalk it up to a lesson learned. Stick with eneloop.