The new and improved Rayovac Mercury Free hearing aid battery means the battery is environmentally friendly while maintaining the power and performance expected of standard batteries. Following 7 years of research and development, Rayovac’s technical experts have overcome the challenges of removing mercury, which is traditionally used in other zinc air hearing aid batteries, to develop Rayovac's best battery ever.Long Shelf Life: All batteries supplied by HEARING SAVERS carry a minimum 12- …