Commonly used in hearing-aids. Out of the box, they have a tab that you peel off to expose little breather holes that allow air into the body of cell to activate it. The cells are normally used to exhaustion and then discarded, but is it possible to remove a partially used cell from a hearing-aid and keep it for later use, possibly by re-sealing the access holes?
Or does the cell just continue to deteriorate once the breather holes have been opened?