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Hearing aid batteries are a vital part of the hearing aid itself. Without power from the battery, the whole device is essentially useless. In fact, they’re so important that a lot of people who wear a hearing aid keep a hearing aid battery tester handy. That way they can tell when the battery is beginning to run out of power. Then they can be prepared with spare batteries when it needs to be replaced.

The length of time that hearing aid batteries will last depends on the style of hearing aid being worn. The smaller hearing aids that fit into the ear canal have a shorter battery life. That’s because the batteries are smaller and contain less of the substances required to produce power.

The older, more traditional kind of hearing aids utilized mercury batteries to keep them going. These batteries are much less effective than the newer zinc batteries that are popular these days.

Zinc batteries utilize zinc air. This is a combination of the zinc contained inside the battery along with oxygen present outside the battery. This produces a reaction that powers the battery. They have about twice the life of the conventional mercury batteries.

You’ll find that zinc hearing aid batteries have a color coded tab. One of the reasons for this is so you can know the size of the battery. However, it also prevents air from entering the battery until you’re ready to start using it.

As soon as the tab is pulled off, oxygen starts to enter the battery. The battery will activate once the zinc and oxygen combine. For this reason the tab should not be removed until you’re ready to use it so it doesn’t start losing power.

There are four common sizes of hearing aid batteries on the market today. Every size of hearing aid has a certain size of battery that fits it. A number 10 battery with a yellow color code is the smallest you can purchase. The blue labels indicate the largest size available, which is 675. The small sizes are most commonly used for the smaller digital hearing aids that go into the ear canal. The large sizes are used for the behind the ear hearing aids.

The bigger sizes can contain a greater amount of zinc inside them, and therefore last longer. But they do take up a lot more space. Many people would rather change the battery more often and have a less noticeable hearing aid.