Kirkland Signature Hearing Aid Batteries are zinc air, mercury-free batteries designed for hearing aids using the standard size 312 format. Each package contains 48 batteries in convenient individual packages for easy storage and freshness. These 1.45-volt batteries are manufactured in Germany and provide reliable power for hearing aids.

Zinc air batteries use air as a source of power. To activate, simply remove the protective tab and wait one minute to allow air to activate the ingredients before inserting into your hearing aid. Battery life varies based on individual hearing loss severity, hours of daily usage, hearing aid features like Bluetooth connectivity, and environmental factors including humidity, temperature, and altitude. Size 312 batteries are one of the most common hearing aid battery sizes and are warehouse-only items at Costco.