Zinc-air (ZR) has a terminal voltage of 1.4 V. Works by an electrochemical reaction where zinc is catalytically oxidized by oxygen from the air. The cathode has a porous structure that allows the passage of oxygen. The zinc anode acts as a fuel source, while the oxygen from the air acts as an oxidant. The zinc-air battery is activated by removing the sealed plastic label. Once air is let into the battery, it takes a few minutes to reach full voltage. An advantage of the zinc-air battery is its high energy density and low weight. Once the battery is activated and the reaction between zinc and oxygen begins, it continues even when the battery is not in use. This results in the battery being discharged within 2-3 months, even when not in use. Normal discharge current: 0.4 - 2 mA depending on the model. Possible current consumption decreases with declining temperature. Zinc-air batteries are mainly used for hearing aids.
