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STARKEY SIZE 312 PREMIUM HEARING AID BATTERY: The #1 Manufacturer of Hearing Aid Batteries. . PREMIUM QUALITY - Long-Lasting Starkey Zinc Air Batteries Built for Today’s Most Demanding Hearing aids. . UNIVERSAL FIT - Starkey 312 Batteries are made to fit all hearing aids that operate using a 312 battery. They use strict tolerance in the manufacturing process to ensure the proper fit of our batteries with your hearing aids. . ZINC AIR - 1.45V Zinc Air Technology Provides Constant Operation for Life of the Battery . MERCURY-FREE - Formula Proudly Produced in the USA with US