Hearing Aid Battery #10 (Package of 4) Renata maximum power Zinc-Air hearing aid batteries last longer, are mercury free, and feature a 4-year shelf life. This battery type replaces all size 10 Zinc Air Batteries, including high power batteries. Size: 10 Shelf life: 4 years Dimensions: 5.8 x 3.6 mm Nominal Capacity: 100 mAh Voltage: 1.45V Brand: Renata Country of Origin: Switzerland.