These are size 312 as shown in the photo so will fit my hearing aids but I have Activeair batteries. According to Duracell customer service, they can last as long as regular batteries or less. I'll try them - if they don't last 7 days like regular Duracell 312 batteries I'll ask for a refund. 7 days. The 2nd package is only enough for 5.5-6 days. Too much trouble to get a refund but I will return any batteries I order in the future if I receive "Active Air" and not what is listed on the product information page.
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