Hearing aid battery types and sizes


Like any technological device, hearing aids run on batteries. Traditionally, most hearing aids have used tiny “button” batteries that wearers have to change every few days to a few weeks. Now, however, many models of hearing aids come with rechargeable batteries. When choosing a hearing aid, it’s a good idea to think about which type of battery is best for you.

Two main types of hearing aid batteries

Rechargeable batteries

Rechargeable hearing aids can be connected
overnight. (Image courtesy of Oticon.)

Most of the latest hearing aid models come with rechargeable lithium-ion batteries. These batteries are usually recharged at night when a hearing aid wearer takes out their hearing aids to sleep. So far, rechargeable batteries have generally only been available for behind-the-ear hearing aid styles. Rechargeable hearing aid brands in the manufacturers market in 2021 included:

  • Oticon Plus, Opn S, Ruby and Play
  • Phonak Audeo, Bolero, Naida and Sky models
  • Starkey Livio Edge AI, Livio AI, Livio and Muse iQ RIC
  • ReSound ONE, ReSound LiNX Quattro and LiNX 3D
  • Widex Moment

Please note that other manufacturers may also offer rechargeable hearing aids; these are some of the best sellers.

How do rechargeable hearing aids work?

Rechargeable hearing aids work very similar to smartphones – you need to charge them frequently to keep them functional. Most of them come with an easy to use docking station. Every night, just pull out “your ears”, plug them into the charger, and go to bed. By morning they should be ready for another full day of use. Battery life may vary: heavy use of Bluetooth, for example, can drain the battery faster. The wrong side? It’s pretty simple: if you can’t charge your hearing aids, they won’t work. So, they don’t work well for everyone, and that’s where hearing aids with disposable batteries come in.

Following: Pros and Cons of Rechargeable Battery Hearing Aids

Standard disposable batteries

Button cells like these are usually
used in hearing aids

Before rechargeable devices became the norm, all hearing aids came with disposable batteries. Nowadays, they are much less common.

Zinc-air disposable button cell batteries, also known as “button cell batteries”, are the other popular option. Since zinc-air batteries are air activated, a factory-sealed sticker allows them to remain inactive until removed. Once peeled off from the back of the battery, the oxygen will interact with the zinc in the battery and “turn it on”. To get the best performance from a zinc-air battery, wait about a minute after removing the sticker to fully activate it before placing it in the hearing instrument. Replacing the sticker will not deactivate the battery, so once the sticker is removed, the battery will remain in an active state until the power is depleted.

Zinc-air batteries remain stable for up to three years when stored in a dry environment at room temperature. Storing zinc-air batteries in the refrigerator is of no benefit and may cause condensation to form under the sticker, which may prematurely shorten battery life. Traditionally, hearing aid batteries were produced using trace amounts of mercury to aid conductivity and stabilize internal components, but mercury is no longer used in hearing aid batteries.

Hearing Aid Battery Facts & Tips

(Key: BTE = behind the ear, ITE = in the ear, RITE = receiver in the ear; ITC = in the canal; CIC = fully in the canal.)

Disposable Hearing Aid Battery Sizes

Hearing aids come in many different sizes and styles and with different power needs. Larger hearing aids require larger batteries. Additionally, hearing aids for people with severe or profound hearing loss typically require more power and larger batteries.

There are five sizes of hearing aid batteries available on the market. The sizes from smallest to largest are: 5, 10, 312, 13 and 675. Size 5 hearing aid batteries are rarely used. The four most common hearing aid battery sizes are all smaller than the diameter of a dime:

  • Size 10 – 5.8mm wide by 3.6mm high
  • Size 312 – 7.9mm wide by 3.6mm high
  • Size 13 – 7.9mm wide by 5.4mm high
  • Size 675 – 11.6mm wide by 5.4mm high

Color coded for disposable hearing aid batteries

Since size differences can be hard to notice and remember, the battery packaging is color coded, so it’s easier to find and buy the right ones.

  • Batteries size 10 – yellow
  • Batteries size 312 – brown
  • Batteries size 13 – orange
  • Batteries size 675 – blue

Battery life for hearing aids

Non-rechargeable hearing aid batteries can last from five to 14 days, based on a 16 hour day of use. It depends on the size of the battery and how much power the hearing aid requires. Typically, smaller batteries have a shorter lifespan than larger ones.

The average lifespan of hearing batteries is as follows:

  • Size 10 – three to seven days
  • Size 312 – 3 to 10 days
  • Size 13 – 6 to 14 days
  • Size 675 – nine to 20 days

If the battery life is reduced, there may be a problem with the hearing aid. In this case, you should consult your user manual or contact your hearing care professional to make sure everything is working properly.

How to extend the life of a hearing aid battery

While there is no surefire way to extend the life of a non-rechargeable battery, these tips will ensure that power is not wasted.

Turn off hearing aids when not in use and leave the battery door open overnight. Not only will this help prevent the battery from being wasted, but it will allow any moisture that has accumulated during daytime use to evaporate overnight.

To get the best performance from your batteries, always store them at room temperature. Exposure to heat and humid environments such as a bathroom will reduce battery life. In addition, batteries should not be carried loose in pockets, purses or backpack where they might come into contact with other metallic objects like coins or keys which can short circuit. hearing aid batteries.

Following: How to get the most out of your hearing batteries

Hearing aid battery brands

Common manufacturers of non-rechargeable hearing aid batteries include Rayovac and Energizer. However, many hearing aid manufacturers wholesale batteries to hearing care professionals, and the batteries may bear the mark of that hearing aid manufacturer.

Another common practice is private labeling of batteries. This means the hearing care professional can buy batteries in bulk and have them labeled with the name, address, phone number, and logo associated with their office.

Regardless of the brand, most hearing aid batteries are made by trusted companies that produce other types of batteries for all types of electronic devices.

Hearing Aid Battery Safety

According to the National Capital Poison Control Center, more than 3,500 Americans of all ages swallow disposable button batteries each year. If this happens to a person or pet in your home, seek medical attention immediately.

Following: Safety and disposal of hearing aid batteries

Where to buy hearing aid batteries

Batteries are generally available at retail stores, drugstores, grocery stores, electronics stores, and online retailers.

You can also choose to purchase batteries from a hearing aid center near you. Since hearing care professionals run out of batteries quickly, many wearers feel like they have fresher batteries. Plus, if you forget the size of battery you need for your particular device, the hearing care professional will make sure you purchase the correct one.

Also, it’s worth asking if your hearing care professional offers any type of drum club or discount program. These programs can save you money on your battery purchases, and in some cases, you can have the batteries shipped to you directly, saving you a trip to the office.


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