Its really not corrosion, but rust. The batteries are made out of nickel-plated steel, so they can be affected by moisture which will eventually cause rusting. Remove the corroded/rusted battery from the aid immediately and return it to the manufacturer. Rayovac guarantees all of our batteries with 100% satisfaction.
About Rayovac Hearing Aid Batteries:
Rayovac Hearing Aid Batteries are the number one choice of hearing care professionals! Rayovac ProLine Advanced premium zinc air hearing aid batteries offer you long-lasting performance. You can count on Rayovac ProLine Advanced batteries to offer you predictable battery life and consistency - battery to battery. If you would like additional information please visit http://www.rayovac.com/hearing/
