Rayovac Extra Size 13 Hearing Aid 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. Our size 13 batteries represent the ideal combination of size and long-lasting power, packaged in boxes of 80. Quantity Add to cart Description 37¢ per battery! Size 13 pack of 80 batteries Three Year Date Code- longest available Larger Tab Design World’s Longest Lasting Battery Made in U.S.A.