Quick answer: Most hearing aids use zinc-air batteries (sizes 10, 13, 312, 675) or a built-in rechargeable battery. The right battery depends on your hearing aid model, your usage, and how you store and handle batteries. If you are unsure, match the battery size number on your old pack or your hearing aid manual, then focus on fresh stock, correct storage, and safe handling.
In this guide, we walk through how hearing aid batteries work, how to pick the right type and size, how long they typically last, and the simple habits that help them perform reliably in New Zealand conditions.
What types of batteries are used in hearing aids?
There are two common battery setups:
- Disposable zinc-air batteries: These are the most common. They activate when you remove the sticky tab and air enters the battery.
- Rechargeable hearing aids: These use a sealed, built-in battery and charge in a dock or case.
If you use disposable batteries, you can browse options here: Shop hearing aid batteries.
How zinc-air hearing aid batteries work
Zinc-air batteries are designed to be small but steady. They stay inactive while the tab is on. Once you peel the tab off, oxygen starts the chemical reaction that produces power.
Two key implications:
- They start activating as soon as the tab comes off, even if you do not put the battery into the hearing aid straight away.
- Airflow matters, so blocked vents, humidity, and how you store batteries can affect performance.
Battery sizes explained: 10, 13, 312, 675
Disposable hearing aid batteries come in four standard sizes. The size is printed on the pack and usually on the hearing aid documentation.
- Size 10: Smallest, often used in very small hearing aids.
- Size 312: Common in many modern styles.
- Size 13: A bit larger, often used when more power is needed.
- Size 675: Largest, often used for high power devices and some implants or accessories.
If you want to narrow down by size, these collections can help:
How long do hearing aid batteries last?
Battery life varies a lot. As a rough guide, many people see anything from a few days to around two weeks per battery, depending on size and usage.
What tends to reduce battery life:
- Streaming audio or frequent Bluetooth use
- Higher amplification needs
- Long daily wear time
- Hot, humid storage conditions
- Removing the tab too early and leaving batteries out
How to change hearing aid batteries properly
- Wash and dry your hands.
- Open the battery door fully.
- Remove the old battery and dispose of it safely.
- Peel off the tab on the new battery.
- Wait about 1 to 2 minutes before inserting it (this can help the battery fully activate).
- Insert with the plus side facing the correct direction (match the markings in your device).
- Close the battery door gently. If it does not close easily, do not force it.
If changing batteries is fiddly, a steady routine and the right storage can make it easier. Some people also like scheduled deliveries: Battery subscriptions.
Storage and handling tips that help batteries last
Most battery complaints come down to handling and storage rather than the battery itself. We recommend:
- Store at room temperature in a dry place.
- Avoid the fridge. Condensation can cause issues.
- Keep batteries in the original pack until you need them.
- Do not remove the tab early. Only peel it when you are ready to use the battery.
- Open the battery door at night to reduce moisture build-up in the device (if your hearing aid uses disposable batteries).
Common battery problems and quick fixes
My new battery is dead
Check the expiry date, make sure the tab was fully removed, wait 1 to 2 minutes after peeling the tab, and confirm the battery is inserted the right way around.
Battery drain seems faster than usual
Streaming, higher volume, or long days can shorten life. Also check for moisture. If your hearing aid has been exposed to humidity, a drying routine can help.
The battery door will not close
Do not force it. The battery may be upside down, the wrong size, or the door could be blocked by debris.
My hearing aid cuts out or crackles
This can be battery-related, but it can also be wax, moisture, or a fit issue. If a fresh battery does not help, consider cleaning and checking wax filters.
Disposable vs rechargeable: which is better?
Neither is universally better. It depends on your lifestyle.
- Disposable batteries can be convenient if you travel often, prefer quick swaps, or want to avoid charging.
- Rechargeables can be simpler day-to-day if you are happy with a nightly charging routine.
If you are frequently running out of power, it is worth discussing your typical day with a hearing professional so your setup matches your needs.
Battery safety in the home
Hearing aid batteries are small and can be dangerous if swallowed, especially for children and pets. Store batteries out of reach, keep spares secured, and dispose of used batteries promptly.
FAQs
What batteries do hearing aids use?
Many hearing aids use disposable zinc-air batteries in sizes 10, 13, 312, or 675. Some hearing aids use a built-in rechargeable battery instead.
How do I know what size hearing aid battery I need?
Check the number on your current battery pack, your hearing aid manual, or the label from your hearing clinic. The four standard sizes are 10, 13, 312, and 675.
Should I wait after removing the battery tab?
Yes. With zinc-air batteries, waiting about 1 to 2 minutes after removing the tab can help the battery fully activate before you insert it.
How long should hearing aid batteries last?
It depends on battery size, daily wear time, and features like streaming. Many people get anywhere from a few days to around two weeks per battery.
Can I store hearing aid batteries in the fridge?
We do not recommend it. Fridges can create condensation, and moisture can affect battery performance. A dry, room-temperature cupboard is usually best.
What should I do with used hearing aid batteries?
Keep used batteries away from children and pets, tape the terminals if you are storing them, and follow your local recycling or disposal guidance where available.
Next steps
- How to choose the right battery size for your hearing aid
- Batteries for hearing devices in NZ
- Shop hearing aid batteries
- Battery of hearing aid: what to know (NZ guide)
- Hearing aid cleaning kit: what to know (NZ guide)
