Rayovac Proline Advanced Size 10 Hearing Aid Batteries (48 Batteries) These are the top of the line batteries from Rayovac, with up to a 4 year shelf life and guaranteed freshness. Rayovac Proline are only sold through Audiologists and Hearing Aid Dispensers. According to Rayovac, Proline Advanced are the longest lasting battery and Rayovac is a leader in hearing technologies! Rayovac uses digital imaging and 104 quality checks to test every battery so we can ensure you receive a powerful consistent battery every time. Please note that Size 10A and 10 are exactly the same and fully compatible. Product Details BrandRayovacManufacturerRayovac ProlineProduct TypeHearing Aid BatteriesMpnIM10-48 Total of 48 Premium Zinc Air BatteriesCompatible with all Size 10 Hearing Aid BatteriesUp to 4 Year Shelf Life Check out my other items. – Powered by