Just received these in the mail, and was really happy to see the date of manufacture was only 9 months ago, so not terribly out of date, and that the first cell I tried provided my Bellabeat Leaf device with full power. I'll update my review later to see if it actually goes the distance and is able to provide a full 6 months of power, as one battery is meant to last in this device, but so far, happy with the purchase. (I'll be even happier if the company actually follows through on providing a 1See full review