Hearing Aid Batteries
Zinc-air-battery-types by Marc Andressen is licensed under Attribution CC 2.0

You could make a strong case that the most important part of your hearing aid is the battery: without it, nothing else works, and if it fails, your hearing fails with it. In this short guide, we’ll provide you with everything you need to know about hearing aid batteries so that you can get the most out of your hearing aids.

How Hearing Aid Batteries Work

Hearing aids take a unique type of battery called zinc-air batteries. Each one has a sticker that covers small holes on the top of the battery. Once the sticker is removed, air enters the battery through the holes, creating a chemical reaction that activates the zinc and makes the battery active. Once the battery is active, it starts discharging power and reapplying the sticker will have no influence in preserving its lifespan.

Hearing Aid Battery Types

Zinc-air hearing aid batteries come in four standard sizes, marked with standardized number and color codes. The four sizes, from biggest to smallest, are:

  • 675-blue
  • 13-orange
  • 312-brown
  • 10-yellow

Each hearing aid uses only one of the sizes, and your hearing specialist will tell you which size you require. Also remember that the numbers and colors above are manufacturer independent, but that manufacturers often add additional letters or numbers to its packaging.

Hearing Aid Battery Life

Hearing aid battery life is dependent on a wide array of factors. Many patients get up to one week of life out of a battery if they use the hearing aid for 12 or more hours a day, but this will fluctuate depending on:

  • The size of the battery – larger batteries have a longer life.
  • The amount of hearing loss – More serious hearing loss calls for additional power.
  • Hearing aid features – wireless capability, noise reduction applications, and multi-channel processing, for example, require more power to work.
  • Temperature – hot and cold temperatures can diminish battery life.

Your hearing specialist will explore all of this with you, and can help you uncover the right balance between hearing aid capability and battery life.

How to Lengthen the Life of Your Hearing Aid Batteries

You can easily prolong the life of your hearing aid batteries with one basic trick. Just after you remove the sticker to activate the battery, wait 5-7 minutes before placing the battery in your hearing aids. By removing the sticker and laying the battery flat side up for several minutes, air is able to fully activate the battery before you start using it, which extends its life.

A few other tips:

  • Keep the batteries away from coinage, keys, or other metal objects that could short the battery.
  • When the hearing aid isn’t being used, turn it off and store it with the battery door open. If you don’t anticipate using your hearing aids for an extended period of time, remove the batteries completely.
  • Unopened batteries can last for years; nonetheless, newer batteries are preferred because each year that goes by decreases the life of the battery.
  • Store your batteries at room temperature. This tip is so crucial that the next section is devoted to the topic.

How to Store Your Hearing Aid Batteries

There’s a dangerous myth out there suggesting that storing your batteries in the refrigerator extends their life. This is not only untrue; it produces the opposite effect!

The reasoning behind storing your batteries in the refrigerator is that the cold temperature will slow down the release of power. While this may be technically true, the amount of power you will save will be negligible, and the harmful effects of moisture will produce far greater negative consequences.

Storing zinc-air batteries in a cold environment allows micro condensation to form in an on the battery, leading to corrosion and a high risk of premature failure. Consequently, for ideal performance, simply keep your batteries away from extreme hot or cold temperatures and store at room temperature.

Managing Your Hearing Aid Battery Supply

Once you confirm how long your batteries last, on average, you’ll want to keep a month’s supply. If your batteries last 1 week, and you make use of 2 batteries (1 for each hearing aid), then you’ll end up using roughly 8 per month. Simply set 8 as your reorder target, and once you consume your inventory down to 8, order an additional pack. Alternatively, you may want to look into the price savings associated with bulk buys and maintain a supply that lasts longer than one month. If you’re not certain, we are more than happy to help you establish a plan and will handle all of your hearing aid battery needs. Just give us a call!


Have any other questions? Speak with one of our hearing specialists today!