Rayovac Extra Size 675 Batteries$29.99 RAYOVAC®, the #1 Manufacturer of Hearing Aid Batteries, now brings you Clear Sound Technology. Raising the benchmark of product innovation and providing consistent, quality performance through the whole life of the battery. Sold in boxes of 60 batteries, the size 675 battery provides maximum power over the longest period available for a hearing aid. Quantity Add to cart Description 50¢ per battery! Size 675 pack of 60 batteries Three Year Date Code- longest available Larger Tab Design World’s Longest Lasting Battery Made in U.S.A.