I've been buying my Energizer batteries mainly from Sam's Club so I know I'm getting real ones and not some knockoff. There just about as cheap as Amazon and I can hold the package in my hands to inspect it before I buy. I have been getting at least 8K to 10K pictures per battery set. If you're getting duds, I'd contact Energizer and see what they can do. Doesn't help for missed pics or videos but at least they can recompense you for defective batteries.