I had some problems with some DOA Costco batteries. Now I wonder if they were just too short to make a connection. I was also having some problems with some batteries not lasting very long, like 1 day, and some batteries not strong enough to use for bluetooth. Some would also drop out of bluetooth connections but still run the hearing aid for another day. I switched to Power One, bought from the forum owner (Local Battery) and I am much happier with those batteries.
— Updated —
I had some problems with some DOA Costco batteries. Now I wonder if they were just too short to make a connection. I was also having some problems with some batteries not lasting very long, like 1 day, and some batteries not strong enough to use for bluetooth. Some would also drop out of bluetooth connections but still run the hearing aid for another day. I switched to Power One, bought from the forum owner (Local Battery) and I am much happier with those batteries.