I use 312 size batteries.Costco has there own batteries. They are called Kirkland Batteries. Reading the package, the batteries are made in the USA. The package has a guarantee that the battery meets or exceeds all national brands. If you are not satisfied, you will get a full refund.
I purchased a pack of 40 for 8.99. That averages out to 0.22475 cents per battery. In the past I have paid anywhere from an average of 50 cents to 75 cents per battery.
I am presently testing the performance of the batteries. I usually get @ 5 days use on a battery. If they are as good as the other batteries,then the savings would be more than half my prior costs of batteries.
I’m very happy with Costco batteries. They last me at least 7 days with my Rexon Quintras. Don’t know how much over 7 days since that’s when I change them. For the price, it works for me.
The container-package reports that the batteries are Mercury-Free. The are made in the USA. The package clearly reports a shelf life date of 7-15-17. There is a complete satisfaction warranty or your money back.
I replaced the batteries for the first time. I got 7 days use on the batteries. That is @ 2 days better than any prior battery. Keep in mind, I wear my aids 19 hours a day. I also use it with a Surflink Blutooth amplifier/phone connection. With that amount of use, 7 days is excellent.