I bought a package of 60. Some batteries died in a couple of hours. I had 48 batteries left and decided to check the voltage on some. Good batteries should test near 1.45 to 1.47 volts. Of the remaining 48 not one got up to 1.3. Some were less than one volt. No, it wasn't the meter. I have several meters. But l'm not angry. No big deal. Some times you win and sometimes you loose. Good luck.

I have been using these batteries for a couple of months now. I get about 8 days out of them in my hearing aids. Love the price can't beat anywhere, same size box from my audiologist cost $43.00. I wonder if people who have complained about them not lasting long know that when the sticker is pulled off they need to wait 5 minutes before putting the batteries to use. I don't see this instruction on the package but its what my audiologist told me to do, something to do with the air activating the battery. Works for me.

Expiration is 03 2021. Bought these in May 2017, it is now October. I have used 5.5 packs (6 in each pack) out of the 10 packs.

Previous packets of these batteries lasted exactly 2 weeks in one hearing aid, and that's with opening up the hearing aid every night so the battery won't be used during the night when i am sleeping. Previous actual use was 12-14 hours per day, times 10 days. Not used on weekends. About 120-140 hours per battery. While I thought these were a screaming deal at $15 for 60 batteries, BEWARE these last about a week, and that's opening it up every night! Approx 60 hours. I just opened up a new 'round' of batteries, thinking maybe it was that set of 6 that might be defective. Nope! I put in a new one yesterday and it already is drained in 1 day! One Day! Even worse than the previous packet! Bad because you NEED to be able to count on having effective batteries in your hearing aid! Maybe Amazon has these sitting in a hot warehouse (I live in Phoenix)? Very disappointing. For the price I may try Amazon fulfillment once more, but after that I'm going back to the store or another route.

I like how this lasts me 6 months total for the packs of 6 of them and they lasts a lot long than the regular brands like duracells and energizers .. I wear two hearing aids and I love getting these brands that actually lasts long for .. Each battery last between 7 to 9 days in each hearing aids .. I will always get these kinds all times .. The price is great and I am very satisfied with these batteries,, It is as described and fast shipping ..

Been buying these for over a year now. They last a good week and a few days for my daughter. She wears her hearing aids about 7-9 hours every day. So that's a pretty awesome battery if you ask me.