Rayovac Proline Advanced Hearing Aid Batteries Size 13A (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. Product Details BrandProline AdvancedManufacturerRayovac ProlineProduct TypeHearing Aid BatteriesMpn13A Total of 48 Premium Zinc Air BatteriesCompatible with all Size 13 Hearing Aid BatteriesUp to 4 Year Shelf LifeNow Mercury Free Check out my other items. – Powered by