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An essential component of a hearing aid is the hearing aid batteries. None of the electronic parts will work without being powered by the battery. They're so essential that many individuals who have a hearing aid will also buy a hearing aid battery tester. It makes it easy to know when the battery is running low on power. Then they will know to have other batteries on hand to replace it.
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. The reason is that these are smaller batteries and don't have as much of the power producing components.
Older styles of hearing aid batteries used mercury to power the device. These batteries are much less effective than the newer zinc batteries that are popular these days.
Zinc batteries utilize zinc air. This is a mixture of oxygen in the air along with the zinc present inside the battery. The resulting reaction gives power to the battery. They have about twice the life of the conventional mercury batteries.
Zinc hearing aid batteries come with a color coded tab on them. One of the reasons for this is so you can know the size of the battery. But it also keeps the air out of the battery until it is time to use it.
Once the tab is removed, the oxygen in the air is allowed into the battery. The battery will activate once the zinc and oxygen combine. So it's important that you don't pull off the tab before you need to start using the battery. You don't want it to start losing life before it's even in use.
Most hearing aids today use one of four different sizes of batteries that are readily available. There's a specific size of battery for every type of hearing aid out there. The smallest size is color coded with yellow and is labeled a ten. The largest size is 675 and is labeled in blue. The small sizes are most commonly used for the smaller digital hearing aids that go into the ear canal. The behind the ear devices will use the larger sized batteries.
The larger sizes are longer lasting since there is room to hold more zinc inside the battery. However, they are a lot more bulky. For some people, it's more important that their hearing aid is discreet than it is to change the battery less frequently.
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