Hearing Aid Battery #675 (Package of 6) 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 675 Zinc Air Batteries, including high power batteries Size: 675 Shelf life: 4 years Dimensions: 11.6 x 5.4 mm Nominal Capacity: 650 mAh Voltage: 1.45V Brand: Renata Country of Origin: Switzerland.