Batteries have an expiration date, so you should always try to buy the newest pack of batteries you can find, as well as use up your older batteries first to ensure you get the most life out of them. Many hearing aid batteries are powered by zinc, so you should be aware of the handling and storage instructions concerning zinc. For instance, once you pull the activation tab on zinc batteries, they will begin to drain. However, if you wait five minutes after pulling the tab before popping them in your hearing aids, you could get up to three more days of life out of them. Be sure to remove batteries from your hearing aids when they’re not in use and keep them in a clean, dry place (not the freezer – this will actually drain the batteries faster).