Home / Shop / Batteries, Testers and Tools / Rayovac Proline Batteries Size 312 View cart “Westone TRU Hearing Protection” has been added to your cart. $27.99 Rayovac Proline Batteries Size 312Size 312 Rayovac Proline (brown tab), Mercury Free Batteries. 3 Cards of 16 batteries per card. 48 Total. Out of stock SKU: IM312-48 Category: Batteries, Testers and Tools Tag: Copied From Estes Related products Hearing Aid Battery Tester $7.99 Add to cart Westone DefendEar Digital Shooter $1,250.00 Add to cart Activair Battery Tester $15.00 Add to cart Hearing Aid Dehumidifier (Duck) $9.95 Add to cart