Shelf life varies from product to product.

Batteries are chemical products which internally undergo certain chemical processes over time. Due to this process some batteries slightly discharge during storage.

No. All Panasonic rechargeable batteries come pre-charged. However, due to changes in conditions and temperature during transportation, some discharge may have occurred - meaning the battery may not be at full capacity when you take them out of the package.

Due to chemical reactions inside most batteries, the stored charge of the batteries is reduced little by little. This phenomenon is called self-discharge.

Panasonic hearing aid batteries, or zinc air batteries, need air to work. As soon as you pull off the seal, air will flow into the battery, making it able to release energy. Be sure to let the battery breathe for a few minutes before inserting it into your device.

Assuming your device isn’t faulty, causes may lie in either improper contact with the terminal or in the batteries themselves.

You’re always allowed to board the plane with your hearing aid batteries in the device. For regulations on bringing spare hearing aid batteries, please consider contacting your airline.

When replacing a coin battery, make sure you do the following: insert it the correct way, with plus and minus poles touching the right terminals; use the right coin battery size; avoid dirt or any other substances obstructing proper contact; carefully insert the coin, not putting stress on it as you’re closing up the holder.

Don’t charge an alkaline or zinc-carbon battery, they are not designed to be charged.

There can be several reasons why the appliance doesn't work. The battery can be wrongly inserted in the battery compartment, there can be a bad connection between the battery and the compartment connection terminal or it is possible the appliance does not work properly.