I bought these thinking they are the same as the Sam's/Walmart store brand bulk pack. They are not. About half the batteries are bad out of the pack.They foreshadow their lack of quality control with an insert that says if any of these batteries are bad, please send them to ____ for a replacement. I really do not want to send a 20 (or any number of them) back for a replacement. I just want the battery to work.BTW, I have not check the expected life. As I am only putting them in electronics that get infrequent use (kid's pencil sharpener) or have minimal power demands (remote controls).