If your hearing aid uses size 312 batteries, the main thing to know is that they are the brown-tab zinc air batteries commonly used in many behind-the-ear and some in-the-ear devices. We recommend checking your device manual, the battery door label, or your current pack before reordering so you get the right fit and steady day-to-day performance.
For many NZ customers, size 312 is a practical middle-ground option that balances compact size with reliable runtime. You can browse our size 312 collection or compare options in our hearing aid batteries collection if you are narrowing down the best pack for your device and routine.
What are 312 batteries for hearing aids?
Size 312 hearing aid batteries are disposable zinc air batteries identified by a brown sticker tab. Once the tab is removed, air activates the battery, which then begins powering the hearing aid. This size is widely used because it suits many popular hearing aid styles while still offering dependable performance for everyday listening.
We often suggest confirming size before purchase because hearing aid batteries are not interchangeable across all devices. Even if two batteries look similar, the wrong size may not fit securely or power the device properly.
How to identify a size 312 battery
The easiest way to identify a size 312 battery is by the brown colour code on the tab and packaging. You may also see 312 printed on the packet or battery wheel. Many hearing aids also note the battery size inside the battery compartment or in the user guide.
Common signs you need size 312
If you already use 312 batteries, you may notice one or more of these signs:
- Your current battery pack has a brown tab
- Your device manual lists size 312
- Your hearing aid battery door or tray is marked 312
- You have previously bought size 312 with good fit and performance
If you are still unsure, our guide on how to choose the right battery size for your hearing aid can help you cross-check before ordering.
How long do 312 hearing aid batteries last?
Battery life varies by hearing aid model, streaming use, daily wearing time, sound processing demands, and environmental conditions. In general, size 312 batteries often last several days in many devices, but exact runtime can differ a lot from one user to another.
We find that heavier use, frequent Bluetooth streaming, and long daily wear can reduce battery life. If your routine includes regular streaming or long workdays, keeping a spare pack on hand can make things easier.
What affects battery life most?
- How many hours you wear the hearing aid each day
- Whether your device uses wireless streaming
- The age and condition of the hearing aid
- Humidity and storage conditions
- Whether the battery tab is removed well before use
Best practices for using 312 batteries
To get the most from your 312 batteries, remove the tab only when you are ready to use the battery, then wait about one minute before inserting it. This allows the zinc air chemistry to activate more consistently. Store unopened packs in a cool, dry place and avoid carrying loose batteries in pockets or bags where they may contact metal objects.
For customers who like to compare brands and value, our size 312 compare pack can be a useful starting point.
When should you replace a 312 battery?
You should replace a size 312 battery when your hearing aid gives a low battery alert, sound becomes weak or distorted, or the device stops powering on consistently. It is usually best not to wait until the battery is completely flat if you rely on your hearing aids throughout the day.
We recommend carrying spare batteries when travelling, attending appointments, or spending long hours away from home. A fresh pack is especially helpful if your day includes phone calls, meetings, or streaming.
Can all hearing aids use 312 batteries?
No. Only hearing aids designed for size 312 batteries should use them. Other devices may require size 10, 13, 675, or a rechargeable system. Using the wrong size can prevent correct contact inside the device and may lead to poor performance or fit issues.
If you are comparing options across sizes, our article on 312 batteries in NZ and our broader hearing aid batteries guide are useful next reads.
Tips for storing and handling 312 batteries
- Keep batteries in original packaging until needed
- Store them at room temperature in a dry place
- Avoid refrigerating batteries
- Keep them away from children and pets
- Recycle used batteries where local options are available
Good storage habits can help maintain more consistent performance and reduce waste from damaged or prematurely activated batteries.
Who usually chooses size 312?
Size 312 batteries are commonly chosen by people who want a battery small enough for compact hearing aids while still offering practical runtime for everyday use. Many users like the balance between size and convenience, especially if they prefer a discreet device but do not want to replace batteries too frequently.
FAQs
What colour tab do 312 hearing aid batteries have?
Size 312 hearing aid batteries usually have a brown tab and brown colour coding on the pack.
How do I know if my hearing aid needs a 312 battery?
Check your hearing aid manual, the battery door marking, or your current battery pack. If it says 312 or uses brown colour coding, it is likely the right size.
How long do 312 hearing aid batteries usually last?
They often last several days, but runtime depends on your hearing aid model, wearing time, streaming use, and listening conditions.
Should I wait after removing the tab before inserting a 312 battery?
Yes. Waiting about one minute after removing the tab can help the zinc air battery activate more consistently before use.
Can I use a different battery size if 312 is unavailable?
No. You should only use the battery size specified for your hearing aid, as other sizes may not fit or work correctly.
Next steps
- Shop size 312 batteries
- Browse all hearing aid batteries
- Learn how to choose the right battery size
- Read our NZ guide to finding hearing aid batteries near you
