Rayovac Extra Hearing Aid Batteries, Size 312 (80 Total Batteries) Trust the name you know – Rayovac offers fresh and powerful, mercury-free, zinc-air hearing aid batteries. Stock up with 10 packs of 8 batteries (80 total batteries) and keep your devices powered up longer. Made in the USA – or UK Try Rayovac batteries today! Product Details BrandRayovacProduct TypeHearing Aid Batteries Check out my other items. – Powered by