This is a good deal on a set of so many of these batteries. I like to have them on hand so I don't have to pay a fortune for just one, when I buy at one of my small local stores. These are Alkaline, 0% Hg. I haven't needed to use them yet, so can't attest to how long they last once installed in a device. But all looks good. There's no expiration date printed on the packaging, but the listing states they have a 3 year shelf life, so I'm just going to jot down the date and year on the packages, for my own use. So I'm happy with them and would recommend them.