We are now offering a wide variety of hearing aid batteries to our customers

Rayovac is the trusted leader in the industry. All Rayovac batteries are top quality and have a shelf file of about 3 years.
Zinc air batteries use air outside the battery as a source of power. The factory applied tab seals the air holes in the battery and ensures freshness until you are ready to use the battery. Do not remove the tab until you are ready to use the battery. To activate the battery, you simply remove the tab. After removing the tab, wait about one minute prior to inserting the battery into your hearing aid. This allows sufficient time for the air to enter and activate the ingredients. 
Replacing the tab when the battery is not in use will not extend the battery life.