We typically use button cells, (which are counted among micro batteries) for hearing aids. As their name suggests, they are reminiscent of a commercially available button due to their small, round and flat design. While mercury-zinc batteries were primarily used in the past, today it is zinc-air systems that are characterized, among other things, by their long service life.

Hearing aid batteries are mainly available in four different sizes: 10, 312, 13 and 675. The following rule of thumb applies: the larger the battery, the more energy it can provide. The choice of the right battery for your own device is dictated by the design of the respective hearing aid and depends on the required energy.

The zinc-air systems used work according to a simple basic principle: air penetrates the housing through holes incorporated in the battery surface and combines there with the zinc it contains, creating zinc oxide. The result of this chemical reaction is energy, which takes into account the necessary power supply. To ensure that this reaction does not occur until the hearing aid batteries are inserted, the holes are sealed with a colored protective film at the factory. This prevents air from entering the openings and combining with the zinc. After removing the foil and inserting it into the hearing aid, it may take a moment, depending on the battery, before the power supply is guaranteed.

Not every battery can be used in every hearing aid. The right size is crucial. Some devices can only be operated with type 10 hearing aid batteries, others only with the 675 variant. Different types of hearing aid batteries can be easily identified using a standardized color scheme for the protective film: yellow, brown, orange and blue (with increasing battery size).

How often you need to change the batteries in your hearing aid depends on the size of the battery, the performance of your hearing aid and how you use your hearing aid. When worn every day, the batteries can last from 3-5 days to 3 weeks, depending on the model.

As with other electronic devices that are operated with batteries, hearing aid wearers can also use a rechargeable battery for energy supply. The big advantage of an integrated battery system is that there is no need to change the hearing aid batteries.

But even those who have a hearing aid without an integrated battery can benefit from rechargeable batteries. Because there are also rechargeable batteries for hearing aids in the size of commercially available button cells.

Either a manufacturer-specific variant – such as Signia offers – or a universal charging station is used for the charging process.

If you are interested in a hearing aid with an integrated rechargeable battery, our experts will be happy to help you over the phone.