Quick answer: An ear aid battery is usually a small zinc-air cell that powers compatible hearing aids after the coloured tab is removed and air activates the cell. In NZ, the most common disposable hearing aid battery sizes are 10, 13, 312 and 675. Check the size printed on your current battery, your hearing aid manual or the battery door, let a new cell air up for about one to two minutes, and keep spare batteries sealed until you need them.
At HearNZ, we make hearing aid battery choice easier for everyday users, carers and anyone who wants reliable spares at home, at work or while travelling. You can start with our hearing aid batteries collection, or go straight to a common size such as size 312 hearing aid batteries when you already know what your device takes.
Power at a glance: what an ear aid battery actually does
A good ear aid battery keeps your hearing aid running through daily listening moments such as conversations, phone calls, alerts and background sound. Most disposable hearing aid batteries use zinc-air chemistry. The small sticker on the battery is not just packaging: it seals the air holes until the battery is ready to use.
Once the tab is removed, oxygen enters the cell and the battery starts to activate. That is why we recommend removing the tab only when you are ready to insert the battery, rather than pre-opening multiple spares in advance.
The colour code decoded for NZ hearing aid users
Hearing aid batteries use a colour system that helps reduce mix-ups. The colour is useful, but it should not replace your hearing aid manual or advice from your hearing care provider.
- Size 10, yellow tab: often used in smaller hearing aids where compact size matters.
- Size 13, orange tab: often used in larger behind-the-ear and in-the-ear styles that need more capacity.
- Size 312, brown tab: a common option for many receiver-in-canal and smaller behind-the-ear devices.
- Size 675, blue tab: often used for higher power hearing aids and some compatible hearing devices.
The HearNZ battery shelf: choose the right fit without guesswork
We stock straightforward options across the key hearing aid battery sizes, so you can match the battery to the device rather than trying to adapt the device to the wrong battery. For size 10 users, we offer Power One Sound Perform size 10 and Rayovac size 10. For size 13 users, you can choose options such as Zenipower size 13 batteries or Power One Sound Perform size 13.
If your hearing aid uses the popular brown-tab size, we carry Rayovac size 312, Zenipower size 312 batteries and Power One Sound Perform size 312. For larger blue-tab devices, we stock Rayovac size 675, Zenipower size 675 batteries and Power One Sound Perform size 675. We also list Zenipower 675P cochlear implant batteries for compatible cochlear implant battery needs.
Tiny habits that protect battery life
Battery life varies by hearing aid style, listening environment, streaming use, daily wear time and battery size. A person who streams audio often may go through batteries faster than someone who mainly uses hearing aids for quiet conversation.
These simple habits can help you avoid wasted cells:
- Wait about one to two minutes after removing the tab before closing the battery door.
- Do not remove the tab from spare batteries until you are ready to use them.
- Store batteries at normal room temperature in a dry place, away from keys and coins.
- Use older packs first if you keep more than one pack at home.
- Open the hearing aid battery door when the device is not in use, unless your clinician has advised otherwise.
When a battery problem is not really a battery problem
If a fresh battery seems to fail quickly, the battery may not be the only cause. Check that the tab was removed, the battery had time to air up, the contacts are clean, the battery is facing the correct direction and the hearing aid has not been affected by moisture or wax build-up.
If the same problem happens with multiple new batteries, it may be time to ask a hearing clinic or device provider to check the hearing aid. We can supply batteries and accessories, but device fitting, hearing changes and repair questions should be handled by a qualified hearing professional.
Safe handling, storage and disposal
Keep all hearing aid batteries away from babies, children, pets and vulnerable adults. Button and coin batteries can be dangerous if swallowed or placed in the ear or nose. If you suspect a battery has been swallowed or inserted into the body, treat it as urgent and seek medical help immediately.
For used batteries in NZ, avoid loose storage in pockets, wallets or bags. Keep used cells together in a safe container and check local battery recycling, take-back or drop-off options.
FAQs
What is an ear aid battery?
An ear aid battery is a small battery used to power compatible hearing aids. Most disposable hearing aid batteries are zinc-air cells, which means they start working when the coloured tab is removed and air reaches the battery.
Which ear aid battery size do I need?
Check the number and colour on your current battery, your hearing aid manual or the inside of the battery door. Common sizes are 10 yellow, 13 orange, 312 brown and 675 blue.
Why should I wait after removing the battery tab?
Waiting about one to two minutes lets air enter the battery and helps the zinc-air cell activate before you close the battery door.
How long does a hearing aid battery last?
Battery life depends on the size, hearing aid model, daily wear time, streaming use and listening environment. Larger sizes often hold more energy, but your device and habits make a big difference.
How should I store spare hearing aid batteries?
Keep spare batteries sealed in their packaging at room temperature, away from moisture, heat, children, pets and loose metal objects such as keys or coins.
What should I do with used hearing aid batteries in NZ?
Place used batteries in a safe container and check local recycling, take-back or drop-off options. Do not leave loose used batteries where children, pets or vulnerable adults can reach them.
Next steps
- Read the battery of hearing aid guide
- Choose the right battery size for your hearing aid
- Explore hearing aid batteries in NZ
- Shop HearNZ hearing aid batteries
