Rayovac Size 312 Hearing Aids – 40 to 160 BatteriesSelect the Number of Batteries you need from the dropdown Rayovac’s most advanced hearing aid battery yet. No hearing aid battery lasts long plain and simple, or your money back Rayovac cells are engineered with an advanced formula3 that performs in the most power-hungry hearing devices. This long-lasting formula provides consistent, high-quality performance throughout the life of the battery.  Our innovative package features longer battery tabs4, a secure dial and an easy access. No Hearing Aid Battery Lasts Longer. Our improved cell design and formulation deliver more power to ensure no hearing aid battery lasts longer1. Our battery lasts up to two days longer than our previous formulation Long Lasting, Guaranteed! These batteries come with our four-year freshness guarantee so you can be confident in your purchase. Made in the USA with US and Global Parts Rayovac has been manufacturing hearing aid batteries in Portage, WI for over 50 years. Through continuous investments and improvements, Rayovac is able to deliver new, innovative battery technology that features peak performance in today’s devices.