Kirkland Signature Size 312 hearing aid batteries are provided as a complimentary gift with the purchase of hearing aids from the Costco Hearing Center. Each pack contains 48 zinc air batteries delivering a reliable 1.45-volt output, designed for consistent performance in modern digital and programmable hearing aids.

These mercury-free batteries are manufactured in Germany and come in convenient individual packaging with easy-grip brown tabs for hassle-free handling and precise insertion. Zinc-air technology activates upon tab removal, allowing ambient air to power the cell and sustain a steady voltage level throughout its operating life. Size 312 is one of the most widely used hearing aid battery sizes, compatible with many behind-the-ear (BTE) and receiver-in-canal (RIC) hearing aid styles from leading manufacturers.