60 Rayovac Extra Mercury Free Batteries, Size 312Zinc Air Hearing Aid Batteries. (60 batteries Standard dial pack, 10 cards of 6 cells each). Rayovac Hearing Aid Batteries, are the best selling brand and they claim to have the world's longest lasting hearing aid batteries. Experience the world's longest lasting mercury-free hearing aid batteries - Rayovac Mercury Free, The Green Choice. Delivering 30% more battery life than other mercury-free hearing aid batteries, Rayovac Mercury Free offers consistent power and performance with an environmental focus.
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