Great value and long lasting.Hearing aid app shows only 40% when a new battery is placed in hearing aid. This happens intermittently with the Power One batteries.The batteries seem to be lasting well, so I retract my earlier review which contained some skepticism!!I have used these batteries before and been very pleased although I believe they came from a different supplier. This batch has a 'sell by date' of February 2018 and I just bought them last week (end of Oct. 2018). Have first set in the aids and I will see if they last as long as they have in the past. Not pleased with the bad date!!I 'ran' the first set of this batch of batteries this past week. Very satisfied with the life. The one thing I noticed is that they ran the normal 1 week, but didn't seem to power down the last day or so which I have been experiencing with the house brand I have recently used from the "300 dollar" store,...you know, the membership store where you can't seem to get in and out for under $300. Think that I'll go back to using these batteries,..a few cents more but I believe better life!La calidad no es totalmente buena, pues alguna q otra batería no funcionaThe battery box pkg was torn & damaged inside the Amazon mail envelope. Also the zippered pouch wasn't included as advertised.health and physical condition necessarygreat productgreat value for moneyI have found that these German made hearing aids last much longer than the other article aids that I have tried.I have been using these Power One batteries for about 4 months now. Previously, I was using the Siemens batteries supplied by my audiologist with the purchase of my Widex hearing aids.I have been keeping a spreadsheet to track how long the batteries last and compared the longevity of the Siemens vs. Power One batteries in my Widex hearing aids. After six months using the Siemens batteries, my average battery life was 6 days. The Power One batteries are averaging 5 days life between changes.Obviously, how many days one gets out of their batteries (regardless of brand name) depends on how many hours a day they are turned on, and how much TV/music streaming one does each day. I have my aids on from about 7:30 AM to about 9:00 PM every day. I stream about 2-hours of TV to the hearing aids during this time, too.So, considering the price of the Power One batteries, I think they are a good value and worth the purchase. I'm sure the Siemens batteries would cost much more than the Power One's.I just opened a new package, with a best before date of 2024 01. Four batteries in a row were dead within 30 minutes of putting them into my hearing aids. Lot #1529X.I bought these because they are German made and had a good rating from the German testing bureau. Obviously they missed this batch.Après quelques mois d'utilisation,je constate que depuis presque deux mois mes batteries font a 2 jours,tandis qu'au début c,était presque 6jours pour un appareil et l'autre presque 8 environ....un treès mauvais produit,j'ai mis une étoile, mais s'il l'option de zero était disponible je j'aurais fait.Today, I found three duds (lasting 1 to 3 hours) inside one pack of hearing aids. Talk about poor quality control or just a lousy product. I am afraid to keep the remaining 19 packs, therefore I am returning them for a refund.I will stick with my trusty Rayovacs.I have no known problem with the item(s) received . The expiration date is fine and I have used those kind of hearing aid batteries before. The delivery was somewhat surprising . My Order was delivered to 73 George Aaron Drive , Deer Lake (by Purlator). Someone at that address was expecting a package and accepted mine.The deliverer left and my package was opened . I was then contacted by the Mother of the receiver and had to go a couple of kilometers to pick it up. Nothing was missing and I got to meet both parents of the young lady who accepted and opened my package.Fortunately, the family at 73 George AAron Drive was reliable. Earl Ball , 73 Goose Arm Road, Deer Lake, nl