For many elderly people wearing a hearing aid becomes a very important daily activity. This expense, in addition to other drug and quality of life necessities, needs to be as cost effective as possible. The use of zinc air batteries helps make for a cheap hearing aid, but also a good quality hearing aid. These batteries are very energy dense and also quite inexpensive to produce. That helps to keep the costs down for anyone who may need a hearing aid and the associated costs that come from needing to replace batteries from time to time. That translates to some good news we can all hear.