I had similar issue. Went back to Costco to have HA checked. There was something wrong with the left HA. Since it was under warranty, it was sent back for repairs. Came back 2 weeks later, everything is good. If you go back and it needs repairs, request a loaner pair of HA. They are available. An additional piece of advice. If you do a lot of streaming, 4 days between changing batteries.
I went and purchased a pack of Duracell Trusted batteries and so far they have lasted 26 hours with 60% left and no issues. I will be returning my Costco batteries and get mine from Amazon.
When we are talking days how many hours a day. I am assuming 10 hrs a day so 50-70 total hours expected. Sound right?
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FWIW-- I have had exactly the same issue with Kirkland 312s – multiple packs over a period of time, so not " a bad batch. "
Sometimes they install at less than 100%. Sometimes they drain to a low level in a day. Sometimes they die within hours or even immediately. Sometimes they die slowly so I get warning chimes. Sometimes they die suddenly with no warning. And this can happen even if I’m not streaming or doing anything intensive If I put in a new battery it of course might do the same thing so I don’t dare to go out without a full pack of batteries.
I initially thought they were terrific – great price, and they lasted much longer than any other brand. So the comment that they changed providers interests me. I have thought about having my HAs checked out (Oticon OPN) but was deterred by covid closure.
I’ll try some other brands but am not sure that will prove if it’s the HAs or the Kirklands as the problem is completely in consistent in its manifestations.
I would urge you to try Duracell or other top Brand. Your experience is exactly the experience I have had with them. I think you will be happy.
The batteries sold right here on this forum are a great price and have always done well for my wife and I.
We use the Power 1 batteries.
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Agree. Power One is the #1 rated hearing aid battery by many. I did not realize they were sold on this site.
I have Oticon Opn 2 miniRITE T hearing aids. When Costco switched manufacturers about a year or two ago (not sure how long it has been) I could no longer use the Costco batteries. They had worked fine and been great with the previous manufacturer. I am so disappointed they changed manufacturer.
I have the same issues where the battery could last two hours or a couple days but never consistent and for a full five days like I had been used to.
I have switched to buying my batteries from Sam’s Club for a similar price to Costco and they last a normal amount of time. I do switch my batteries between my left hearing aid and right hearing aid each morning when I put them in so they end up running out about the same time.
I thought it was just me that had issues with the Costco HA batteries, nice to know it is not just me.
Rkennedy how do you like the Phillips other than the battery issu? I just ordered them from Costco, but I went with the rechargeable ones. Don’t see many reviews online anywhere. New to the site and just thought I’d ask. Thanks!
I will admit I was very hesitant to go with them because I could not find many reviews. However, I have been very happy with them. I have had absolutely no issues with them. I can have normal conversations with my wife across the room and understand every word she says and have the tv volume on 13 vs 28 without them. Costco set them at 80% but planning on going to 90% this Thursday. They have it set currently on everything automatic. She said we would discuss turning on T-Coil and the buttons. I am very happy with automatic and can not tell if it has changed programs. I was leaning towards Phonak but she talked me out of it. 5.5 months left to change my mind but currently I am happy.
Awesome I’m happy to hear that. My tech hasn’t sold any in the 2 years since he became licensed. Made me a bit nervous. He said hi Phillips rep is going to be in the day before I come in for the fitting. I told him to learn a lot of good stuff for me. 
. He said he would.
I have been using Costco Kirkland Signature 312 batteries for 8 years. Never had the problems shown here. I use 4 batteries each week, works well for me.
I think you will be happy with them if your fitter knows what he is doing and sets them with REM. Be sure he does.
Update on Costco Philips 9010 battery issues. Returned the aids to Costco today and was told they had called Philips to send a new pair and she was told their is a major chip problem with the 9010 312 battery aids. My choice was to go with the mini or the rechargeable ones which are not having any issues. So if you have purchased Philips 9010 with the 312 battery and having short battery life or other issues return for full refund.
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Glad I ordered rechargeable! What did you end up doing?
I went with the Philips 9010 rechargeable? Should be in next week. I have loaners until then?
I just purchased some Amazon Basics batteries, 60 count, for $18.22. They are lasting me maybe 3 days. Haven’t paid close attention.
The hearing aid specialist at Costco told me I’d probably get 3 days if I stream a lot, otherwise maybe 5 days. I do stream a lot.
One question: How do you find the battery level? I can’t find that info anywhere in the MyPhonak app.
I would like to share my recent experiences on this subject I have been using Costco KS9 Aids for 11 months and had about 5 days service life with Costco batteries when streaming TV sound about 3-4 hrs daily. No other streaming usage, no phones nor computers etc.
Along comes Covid 19 with associated lifestyle changes (5 hour TV viewing) and coincidentally the Phonak Target software upgrade that I self install. I also change the TV audio connection from Analog to Toslink digital.
My battery life goes erratic and I assume it’s because of a new Costco card with a bad batch of batteries. Battery life seems OK when used without streaming during daytime but fails within 1-2 hrs when streaming TV. After trying a dozen batteries with similar results I’m finding that if the battery is tried again the next day, after resting for 24 hrs that it has recovered and is functional again. This success repeats for another few days till failure.
As I can’t return the aids to Costco yet for testing because of the Covid shut in I then tried Amazon basic batteries as they do delivery. Same results it seems with erratic service life.
I suspect that perhaps the battery quality is bad or that the latest Target Software upgrade increases the Streaming power draw causing a lower voltage so the HA shuts off and requires a new battery. The battery regenerates and is serviceable the next day and the cycle continues for a few days till failure.
All comments on my experiences would be appreciated.
My batteries last about 80 hrs or 7 days.
Perfect. Which hearing aid? Do you do any streaming?