I had to have made me happy a bargain, because these batteries, which I otherwise always used, usually last a long time, but are much more expensive in the usual shops. I use it for my computer usually mice in which they normally hold about 3-4 months. When the batteries after 14 days were empty the first time, I was initially just surprised. Meanwhile, I can confirm, unfortunately, that this reflects the actual performance period of the delivered goods. I have the batteries in the meantime also used different, but note that they are very fast empty there. Meanwhile creeps me the feeling that me here half-empty batteries were sold.