The Rayovac Extra Mercury Free hearing aid batteries are the latest model from Rayovac. The mercury-free batteries are environmentally friendly. Rayovac Size 312 PSA and hearing aid battery pack. With this annual pack you will receive 60 batteries. Features Year Pack of 60 Batteries World's Durable Mercury Free PSA and Hearing Aid Batteries Mercury-free formula with higher voltage for undelayed application Superior cell design that prevents swelling and leakage, guaranteeing optimal performance and greater consistency. Rayovac makes removing the battery from the packaging and inserting it into the device easy. Environmentally friendly packaging made from recycled or recyclable Materials