Zinc Air Batteries
While very similar to other button cell batteries (batteries that are small, round and thin-shaped like buttons), zinc airs differ because they need oxygen from an external atmosphere in order to operate. This eliminates the need for internal, often toxic, material.
Prior to use, however, zinc-air batteries must not be exposed to outside air or they will self-discharge. Without this exposure, though, they have a very long shelf life. There are a number of different recycling methods in which the metal content (zinc) of these batteries can be reprocessed.
