Reader's question: How long do hearing aid batteries last?

How long hearing aid batteries last depends on three factors: battery capacity, daily usage time and power consumption of the hearing aid.

Yesterday I got a question from a reader who wanted to know whether it is "normal" for the hearing aid batteries to only last a week. However, this question is not so easy to answer because - as with other devices - it depends on the capacity of the battery as well as the duration of use and the power consumption of the hearing aid.

How long hearing aid batteries last depends on three factors: battery capacity, daily usage time and power consumption of the hearing aid.

How long hearing aid batteries last depends on three factors: battery capacity, daily usage time and power consumption of the hearing aid.

The rough answer: 5 to 30 days

If you want to know a quick number, you have to be able to live with a very rough figure. This states that a hearing aid battery lasts approximately 5 to 30 days. For most people, it will probably be in the range of a week or two.

Duration depends on the capacity

If you want to determine it more precisely, you first have to take a look at the capacity of the batteries or button cells. There are five common types that are currently used in hearing aids:

  • Type 5: approx. 35 mAh
  • Type 10: approx. 100 mAh
  • Type 13: approx. 310 mAh
  • all-purpose flour: approx. 180 mAh
  • Type 675: approx. 650 mAh

Further dependencies on service life and power consumption

Once the capacity has been determined based on the type of hearing aid battery, two other factors that determine the battery life are, on the one hand, the daily usage time of the hearing aid and the actual power consumption of the device when it is switched on.

Ultimately, however, the user can only determine the daily usage period himself. The other cornerstones could only be changed by buying a different hearing aid that works with different types of batteries and possibly even uses less power.

Hearing aid battery storage time

If you want to know how long hearing aid batteries last, you have to keep in mind that although they have a low self-discharge, they still start to lose capacity after 3-4 years of storage.

Zinc-air batteries, which are usually found in hearing aid batteries, have small holes on the top that serve as air inlets (photos: Sir Apfelot).

Zinc-air batteries, which are usually found in hearing aid batteries, have small holes on the top that serve as air inlets (photos: Sir Apfelot).

This in particular can be a problem when buying inexpensive non-name batteries. Here the buyer often does not know how old they are and how well the protective layer has sealed the air holes in the batteries to prevent the chemical reaction through which the zinc-air button cells generate their energy.

Once air has penetrated the button cell, the battery usually loses its energy charge within four to six weeks, even if it is not used.

Recommendation: Use tested branded batteries

If you are dissatisfied because the hearing aid batteries do not last as long as you expect, then one of my recommendations would be to try batteries from well-known manufacturers such as Duracell, Varta or Rayovac.

The test winners from Stiftung Warentest are also a good recommendation. I have this presented here in a post. If you are looking for type 312 batteries, you should look for the Hearing aid batteries Power One P312 from Varta look at.

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