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Hearing Aid Batteries

Discover the importance of high-quality hearing aid batteries for uninterrupted hearing. Making the right battery choice is the first step to ensuring your hearing aids function at their best. 

This article contains everything you need to know about hearing aid batteries, including how they work and the pros and cons, so you can feel confident and informed when making your decision.

Hearing aid batteries: how do they work?

In the past, mercury-zinc batteries were commonly used for hearing aids. Nowadays, zinc-air batteries have become the preferred choice due to their eco-friendliness and steady voltage. These batteries are designed with a special protective foil covering the openings to preserve their power.

Before using a zinc-air battery in your hearing aid, it's important to remove this protective foil,as the battery becomes active once the foil is removed. This means there may  be a short delay before it powers your hearing aid.

Here's how a zinc-air hearing aid battery works:

1. Small openings on the battery's surface allow air to enter.
2. This air interacts with the zinc inside the battery, creating zinc oxide.
3. This chemical process generates the battery's energy.

It’s important to remember to only peel off that protective foil when you're all set to use the battery in your hearing aid.

Types of hearing aid batteries

Rechargeable hearing aid batteries

Rechargeable hearing aid batteries have become increasingly popular, offering a convenient and eco-friendly alternative to traditional disposable batteries. These batteries are typically lithium-ion or silver-zinc, known for their durability and longevity.

Sustainability: Rechargeable batteries are a more eco-conscious choice, reducing the environmental impact of disposable batteries.
Cost-effective: Over time, rechargeable batteries can be more cost-effective as you won't need to purchase replacements continually.
Convenience: They eliminate the hassle of regularly changing disposable batteries, making them a hassle-free choice for many users.
Lifespan: Rechargeable batteries tend to have a longer lifespan compared to disposable options.
Initial cost: Rechargeable hearing aids often have a higher upfront cost due to the built-in rechargeable system.
Charging time: Users must remember to charge their hearing aids regularly, which can be inconvenient if forgotten.
Limited availability: Not all hearing aids support rechargeable batteries, limiting choices for some users.
Common use cases
Active lifestyles: Rechargeable batteries are ideal for individuals with active lifestyles who may find it inconvenient to change disposable batteries on a regular basis.
Tech enthusiasts: Those who appreciate the convenience of modern technology often opt for rechargeable hearing aids.
Eco-conscious consumers: Users who prioritise sustainability and reducing battery waste choose rechargeable options.


Disposable hearing aid batteries

Disposable hearing aid batteries have been a trusted power source for hearing aids for many years. These batteries come in zinc-air variations, each identified by a distinct colour code.

Widespread availability: Disposable batteries are widely available, making them accessible for many users.
Lower initial cost: They typically have a lower upfront cost, making them budget-friendly.
Readily replaceable: You can easily find replacements when needed, even when travelling or in emergencies.
No charging: No need to remember charging routines, as you simply swap out the old battery for a fresh one.
Regular replacement: Disposable batteries must be replaced regularly, leading to increased long-term costs and environmental waste.
Environmental impact: Discarded disposable batteries contribute to electronic waste, posing environmental concerns.
Limited lifespan: These batteries tend to have a shorter lifespan compared to rechargeable options.
Battery changes: Users must be diligent in monitoring and replacing batteries to avoid interruptions in hearing aid function.
Common use cases
Infrequent hearing aid use: Individuals who use hearing aids only occasionally may prefer disposable batteries for their simplicity.
Budget constraints: Hearing aids with disposable batteries have a lower upfront cost, making them an attractive option for cost-conscious users.

The choice between disposable and rechargeable hearing aid batteries ultimately depends on individual preferences, lifestyle, and the type of hearing aid. Each type offers distinct advantages and trade-offs, allowing people to select the best fit for their needs.

View hearing aids range

Hearing aid battery sizes: how to choose

Hearing aid batteries come in different colours to represent various sizes and power levels. The colour codes generally follow this standard:

Yellow hearing aid batteries
Size 10
The smallest battery, often for in-the-ear (ITE) or completely-in-canal (CIC) hearing aids.
Brown hearing aid batteries
Size 312
A slightly larger battery, used in smaller behind-the-ear (BTE) and some ITE aids.
Orange Battery Orange hearing aid batteries
Size 13
A larger more powerful battery, typically used for larger BTE and some ITE aids
Blue hearing aid batteries
Size 675
The largest and most powerful battery, used in high-power BTE aids and some cochlear implant processors.

Always refer to your hearing aid's manual or consult your audiologist to ensure you're using the correct battery size. Some devices may have specific recommendations, so it's essential to follow the manufacturer's guidance.

How to insert your hearing aid batteries

Changing the batteries in your hearing aids is a straightforward process that ensures your devices function optimally. To help you through this task, we've outlined the steps for you:

1. Peel off the protective foil from the new batteries.
2. Wait about two minutes for the batteries to activate fully.
3. Insert the batteries correctly, matching the plus (+) and minus (-) signs inside the battery compartment.
4. If your hearing aid doesn't work with the new battery, check for dirt in the compartment or try a different battery.
5. If issues persist, consult a hearing care professional for assistance.

By following these simple guidelines, you can efficiently change the batteries in your hearing aids and ensure they continue to help you hear clearly and comfortably.

Maintaining your hearing aid batteries


This depends on the type of hearing aids you have and the type of batteries they use, as well as how long you wear your hearing aids. A size 10 battery in a hearing aid with lots of advanced features might last between three and five days, whilst a larger, size 13 battery in a hearing aid with simpler functions could last for up to three weeks.


Ensuring the safety of your loved ones is above all when it comes to storing hearing aid batteries. These small but essential power sources can pose risks, especially to young children or those with additional vulnerabilities. 

To prevent accidents, always store hearing aid batteries securely and out of reach in households with children under five or individuals facing heightened risks. Accidental ingestion of a battery should be treated as a medical emergency. Remember that hearing aid batteries are not for ingestion and should only be handled by a responsible adult.  We recommend keeping them safely stored to promote a secure environment in your home.


Used batteries shouldn’t be thrown away with normal rubbish or recycling. Instead, take them to your local battery recycling point, these can often be found at supermarkets. 

Battery care tips

Hearing aids are invaluable devices, and their performance often depends on the condition of their batteries. 

To help you keep your hearing aid batteries healthy and long-lasting, we've put together a practical checklist. By following these steps, you can ensure that your batteries deliver optimal performance and reliability.

  • Proper storage: Store batteries in a cool, dry place away from direct sunlight and extreme temperatures, as heat can affect their performance.
  • Use the oldest first: If you have multiple batteries, use the oldest ones first to ensure they don't expire before use.
  • Keep them sealed: Store batteries in their original packaging until you're ready to use them to prevent exposure to air, which can reduce their lifespan.
  • Wash hands: Clean hands before handling batteries, as oil and dirt can affect their conductivity.
  • Open daily: If you're not using your hearing aids for an extended period, open the battery compartment to prevent moisture buildup, but remember to turn them off.
  • Avoid refrigeration: Contrary to some beliefs, refrigeration doesn't extend battery life, as it can introduce moisture.
  • Keep them dry: If batteries get wet, discard them; water can damage them.
  • Store spares: Always have spare batteries with you, especially when travelling.
  • Check expiry dates: Ensure your batteries are within their expiration date for optimal performance.
  • Dispose properly: When replacing batteries, dispose of old ones safely following local regulations.

Frequently asked questions

How long do hearing aid batteries last?

The lifespan of hearing aid batteries can vary depending on factors like battery size, brand, and the hearing aid's power consumption. Typically, hearing aid batteries can last anywhere from 3 to 14 days.

What are the best hearing aid batteries?

The best hearing aid batteries depend on your specific hearing aids and preferences. Common types include zinc-air batteries, which are known for their high energy density and long life. 

However, it's essential to choose batteries that are compatible with your hearing aids and meet your needs.

How long do NHS hearing aid batteries last?

NHS hearing aid batteries typically last around 5 to 14 days, depending on the type of battery used and the hearing aid's power consumption. 

NHS audiology services provide free batteries, so it's essential to manage your supply to ensure you have a steady source of power.

How do I know what size hearing aid battery I need?

Hearing aid batteries come in different sizes, usually labelled with a colour code. The most common sizes are 10 (yellow), 312 (brown), 13 (orange), and 675 (blue)

Your hearing aid's user manual or an audiologist can help you determine the correct size.

How many hearing aid batteries do I need?

The number of batteries you need depends on your hearing aid usage, battery size, and how often you replace them. It's a good idea to keep spare batteries on hand, especially if you rely heavily on your hearing aids.

What is the 5-minute rule for hearing aid batteries?

The 5-minute rule suggests that after removing the tab from a new battery, you should wait for about 5 minutes before inserting it into your hearing aid. This allows the battery to activate fully, ensuring optimal performance.

How do you know when a hearing aid battery is dying?

When a hearing aid battery is running low, you may notice decreased amplification, distorted sound, or intermittent usage. Some hearing aids also have warning beeps or tones when the battery is about to die.

Should I turn my hearing aid off at night?

Turning off your hearing aids at night can help preserve battery life. However, some modern hearing aids have sleep mode or automatic power-off features to conserve energy whilst you sleep. 

It's essential to follow the manufacturer's recommendations for your specific hearing aid model.