The batteries have very short life spanUse these little guys on "fairy" microlites on homemade mason jar bottles. Brightness of the lights is very good. Don't know how long they will last, though. Use few hours a day since I received them (about one month). Cost is very reasonable, and fast delivery.As AdvertisedEverything I put for a five-star is very good don't have any complaints anything I put down for one star I have a problem with them you need to put the size on the material you're selling and how many you have otherwise in that I don't have brake problem I like everything I bought from you peopleI used to buy betteries like this at Radio Shack but not any more! Amazon has come to the rescue. For this price you will get a pair or maybe four at retail store. Please count how many there are in this package. That's right! 25 in all! Of course the count is useless if the batteries themselves are no good but fortunately for us they are good!These batteries probably work just fine, but in the two decorative holiday necklaces I have, they didn't work. I'll be glad to mail them to someone else to try if you let me know where to send them.Good batteries for the value.I installed them in small LED flashlights and they seem to be working okayplusieurs applications pour ce genre de batteries Tres utile et tres satisfaitExcellent product for my homemade card with immediate shipping from seller. I shall continue to return to this store.