PowerOne Size 312 Hearing Aid Batteries (120) - Walmart.com
Amazon.com: Tenergy 1.5 Volt Battery Button Cell LR41, ag3 Batteries Equivalent, Ideal for thermometers, Watches, Laser Pointers, Small Toys, Portable Electronics, and More - 20 Pack : Health & Household
6 Rayovac Extra Advanced - Size 312 Hearing Aid Batteries 1.45V Zinc Air 10012800525116 | eBay