Rayovac Proline Mercury Free Hearing Aid Batteries Size 312 (40)
Rayovac Proline Mercury Free Size 312. 48 Batteries in this pack. These batteries provide an electric current of 1.45mv; for a longer lasting battery that produces a cleaner sound. Proline Advanced Mercury Free: The World's Longest Lasting Rayovac Proline Advanced Mercury Free delivers 30% more battery life than other mercury-free hearing aid batteries. What's more, it's environmentally friendly, with consistent power and performance that rivals mercury-containing products on the market today.