SONY Zinc Air Hearing Aid Batteries. This may surprise you, but Sony is one of the largest micro battery manufacturers in the world. All of their button cell batteries are made in Japan to exacting specifications. These batteries will pleasantly surprise you with excellent performance. Order a carton of batteries and receive FREE: One, Battery Buddy Keychain Battery Holder and a sample packet of Miracell ProEar ointment for irritated, itching ears. Free Miracell Sample must be requested by each customer here- Miracell ProEar