If you want find electro-chemical batteries that has been powered by the oxidation of zinc with oxygen from the air, Zinc-air batteries will meet your demands and requirement. If you want to use your hearing aids in experimental electric vehicles, zinc air hearing will be an important part of a future zinc economy for its high densities energy batteries and not expensive relatively to produce.
Zinc which is composed of particles, are mixed with an electrolyte (usually potassium hydroxide solution). The water and oxygen from the air react at the cathode and form hydroxyls which migrate into the zinc paste and form zincate (Zn(OH)42-), at which point electrons are released and travel to the cathode. The zincate decays into zinc oxide and water is released back into the system. It was Rayovac Corporation, who manufactured a size 675 HP-type zinc air hearing for the first time.
At the factory, these holes are covered by a protective tab. When the dry cell is to be used, the tab is pulled off to uncover the holes and to permit air to enter the dry cell. The presence of air within the dry cell causes a chemical reaction to take place. This reaction in turn causes a potential difference to come about between the anode and the cathode of the dry cell, thereby causing the dry cell to produce electricity.
It is about a measure of the ability of the cell to retain its performance after the tab is removed. This differs from Service Life in that it refers to the undischarged condition. It is what happens to the battery when the tab is removed or the package is opened and it is placed on a shelf or counter top. Since zinc-air cells obtain the cathode reactant from the air, they are subject to the influence of the environment. More specifically, they can dry-out under conditions of low humidity, or become waterlogged at high humidity due to the ingress of water vapor. If you want to know further detailed information about zinc air hearing especially about their products from the manufacturers you can search them at the websites.
