Hearing aid battery sizes and types: things to know

Every hearing aid depends on a reliable power source. Whether your device uses rechargeable or disposable batteries, understanding the differences between them is key to ensuring optimal performance and convenience.

This guide explores the types, sizes, and lifespans of modern hearing aid batteries, offering clear insights to help you make the most of your device and keep your world sounding its best.

Are all hearing aid batteries the same?

No, not all hearing aid batteries are the same. While most modern hearing aids use zinc–air button cells, these batteries differ in size, capacity, and design, making it important to choose the correct one for your device.

There are four standard battery sizes, each identified by a universal color code: size 10 (yellow), size 312 (brown), size 13 (orange) and size 675 (blue).

The right size depends on the specific hearing aid model, as smaller devices usually require smaller batteries, while larger aids with more power demand need bigger ones.

Even within the same size, batteries can vary across brands in terms of quality, durability, and performance. Factors such as manufacturing differences and internal resistance can affect how long a battery lasts in real-world use. For example, two batteries of the same size may provide different hours of power depending on the brand and the features of the hearing aid, such as wireless streaming.

It is not safe to substitute one battery size or chemistry for another, even if the voltage looks similar. To ensure proper performance and avoid potential damage, always use the battery size and type recommended by your hearing care professional or the hearing aid manufacturer.

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What type of batteries do hearing aids use?

Hearing aids typically use either disposable zinc–air batteries or rechargeable lithium-ion batteries, depending on the model and technology level of the device. Here’s a breakdown of both types:

Disposable zinc–air batteries

These are the traditional types and are still widely used in many hearing aids. They’re activated by exposure to air — once the protective sticker is removed, oxygen interacts with the zinc to produce power.

Main features:

Sizes: There are four standard sizes, each color-coded.
- Size 10 (yellow) – for very small hearing aids (e.g., CIC or IIC)
- Size 312 (brown) – for RIC and some small BTE models
- Size 13 (orange) – for larger BTE devices
- Size 675 (blue) – for powerful BTE hearing aids used for severe to profound hearing loss
Battery life: Typically 3 to 10 days, depending on size, usage, and streaming activity.
Pros: Easy to replace, universally available.
Cons: Short lifespan, need frequent replacement, sensitive to humidity and air exposure.

Rechargeable lithium-ion batteries

Rechargeable batteries have become the standard in most new hearing aid models, offering an eco-friendly and easy-to-use solution. They are commonly recharged overnight using a docking station, much like a smartphone. Users simply place each hearing aid in its designated slot—typically marked blue for the left ear and red for the right.

Indicator lights show when the devices are fully charged. Rechargeable hearing aids generally provide a full day of use per charge, though heavy Bluetooth streaming can reduce battery life.

They are available in both behind-the-ear (BTE) and in-the-ear (ITE) styles. There are two main types of rechargeable batteries used in hearing aids: lithium-ion and silver-zinc.

1. Lithium-Ion Batteries - Lithium-ion batteries are the most common and are usually sealed within the hearing aid. They are recharged via a docking station or portable charger.

Key features:

Battery life per charge: 18–30 hours, depending on usage.

Charging time: Around 3–4 hours for a full charge.
Lifespan: Typically 3–5 years before replacement is needed.
Advantages: Long daily runtime, quick charging, stable performance, and no need to handle batteries manually.
Considerations: As the batteries are sealed, replacement requires professional servicing once they reach the end of their lifespan.

2. Silver-Zinc Batteries - Silver-zinc batteries are less common but still used in some rechargeable models. They offer a user-replaceable alternative.

Key features:

Battery life per charge: Up to 24 hours.

Lifespan: Around 1 year, but easily replaceable by the user.
Advantages: Environmentally friendly, recyclable, and safe.
Considerations: Requires specific chargers and periodic replacement.

Both technologies provide sustainable alternatives to disposable batteries—lithium-ion for convenience and silver-zinc for flexibility and environmental benefits. However, rechargeable hearing aids rely on regular access to power; if they aren’t charged, they can’t be used.

How many types of hearing aid batteries are there?

Most modern, non-rechargeable hearing aids use zinc-air button cell batteries, which are specifically designed for hearing devices. These batteries are small, lightweight, and provide a steady power output, which is essential for the sensitive electronics in hearing aids. Zinc-air batteries are air-activated: they remain sealed until a protective tab is removed. Once the tab is peeled away, oxygen enters tiny holes in the battery and reacts with zinc to generate power. This means the battery begins to discharge as soon as the seal is removed, even if it is not placed in the device.

Hearing aid batteries come in four standardized sizes, each with a universal color code for easy identification: size 10 (yellow), size 312 (brown), size 13 (orange), and size 675 (blue). The correct size depends on the type of hearing aid. Smaller devices, like completely-in-canal models, usually require the smallest batteries, while larger behind-the-ear models often use bigger ones with greater capacity.

On the other hand, many rechargeable hearing aids feature lithium-ion batteries. These are built into the device and can be charged overnight, eliminating the need for frequent battery changes. The choice between disposable and rechargeable depends on the user’s lifestyle, hearing aid model, and personal preference.

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Hearing aid battery types: things to know

Hearing aids use different types of batteries, each with specific advantages. The two main categories are disposable zinc-air batteries and rechargeable batteries, most often lithium-ion.

Zinc-air batteries are the traditional choice and remain the most widely used. They are small button cells that generate power when exposed to oxygen. Each battery is sealed with a protective tab, and once the tab is removed, air activates the cell, and the battery begins to discharge. They are manufactured in four standard sizes, identified by universal color codes: size 10 (yellow), size 312 (brown), size 13 (orange), and size 675 (blue). The appropriate size depends on the design and power needs of the hearing aid. Their lifespan typically ranges from three days to about two weeks, depending on usage and environmental factors. Zinc-air batteries are non-rechargeable and must be replaced once depleted.

Many modern hearing aids now use rechargeable batteries, most commonly lithium-ion. These batteries are built into the device and recharged overnight in a charging dock. They provide reliable power, reduce the need for frequent battery changes, and create less waste. However, rechargeable batteries degrade over time and may need professional replacement after a few years.

Mercury batteries were once common but are now banned due to environmental concerns. Some experimental designs, such as rechargeable zinc-air, are in development but not yet mainstream.

Hearing aid battery sizes, dimensions and color codes

Hearing aid batteries are manufactured in standardized sizes, each with specific dimensions and a universal color code to make identification easier. This system helps users quickly find the correct battery for their hearing aid without confusion. There are four main sizes commonly used:

Size 10 (Yellow): These are the smallest hearing aid batteries, measuring about 5.8 mm in diameter and 3.6 mm in height. They are typically used in very small devices, such as completely-in-canal (CIC) or invisible-in-canal (IIC) hearing aids.
Size 312 (Brown): Slightly larger than size 10, these batteries measure around 7.9 mm in diameter and 3.6 mm in height. They are often used in in-the-canal (ITC) and some behind-the-ear (BTE) hearing aids, balancing small size with longer life.
Size 13 (Orange): Measuring 7.9 mm in diameter and 5.4 mm in height, these batteries provide more power and a longer lifespan. They are common in larger ITC and BTE models.
Size 675 (Blue): The largest standard hearing aid battery, with dimensions of about 11.6 mm in diameter and 5.4 mm in height. They are used in high-power BTE devices, particularly those designed for severe to profound hearing loss.

This color-coding system—yellow, brown, orange, and blue—ensures that users can easily select the correct battery size for their hearing aids.

What is the difference between #10 and #312 hearing aid batteries?

The difference between size 10 and size 312 hearing aid batteries comes down to size, lifespan, and the types of devices they power.

Size 10 batteries, marked with a yellow color code, measure about 5.8 mm in diameter and 3.6 mm in height. They are the smallest commonly used hearing aid batteries, designed for very compact devices such as completely-in-canal (CIC) or invisible-in-canal (IIC) hearing aids. Their small size allows for discreet hearing aids, but the trade-off is a shorter battery life, usually lasting 3 to 7 days depending on usage.
Size 312 batteries, identified by a brown color code, are slightly larger at 7.9 mm in diameter and 3.6 mm in height. This extra size provides more capacity, which extends their lifespan to around 7 to 10 days. They are often used in in-the-canal (ITC) and smaller behind-the-ear (BTE) hearing aids, offering a good balance between size and performance.

What is the difference between 13 and 312 hearing aid batteries?

Size 13 and size 312 hearing aid batteries differ mainly in their dimensions, lifespan, and the types of devices they power.

Size 13 batteries, identified by the orange color code, measure about 7.9 mm in diameter and 5.4 mm in height. Because they are taller than 312 batteries, they have a greater capacity and typically last 10 to 14 days before needing replacement. They are commonly used in larger hearing aids such as in-the-ear (ITE) and behind-the-ear (BTE) models, especially those with high power demands or advanced features like wireless streaming. Their main advantage is longer operating life, which means fewer battery changes.
Size 312 batteries, marked with the brown color code, also measure 7.9 mm in diameter but are slimmer at 3.6 mm in height. Their smaller size makes them ideal for compact devices such as in-the-canal (ITC) and mini-BTE hearing aids. However, this reduced capacity means they usually last only 7 to 10 days.

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What are +312 batteries for?

+312 batteries are small, zinc-air button cell batteries specifically designed for use in hearing aids. The “+” simply indicates the positive terminal, while 312 refers to the standardized size. They are marked with a brown color code for easy identification.

These batteries measure about 7.9 mm in diameter and 3.6 mm in height, making them compact yet powerful enough to support a range of hearing aid models. They are most used in in-the-canal (ITC), in-the-ear (ITE), and some smaller behind-the-ear (BTE) devices. Their balance of small size and moderate capacity makes them popular for hearing aids that need to remain discreet but still require reliable power.

On average, size 312 batteries last 7 to 10 days, depending on the hearing aid’s features and usage, such as wireless streaming or noise reduction. They are disposable, non-rechargeable zinc-air batteries and must be replaced regularly.

What type of battery for hearing aid should I choose?

The answer depends on the type of hearing aids and on your needs.

Rechargeable models suit users who prefer convenience and have daily access to power.
Disposable batteries are ideal for users who travel often or don’t want to depend on charging.

What is the best hearing aid battery?

The best hearing aid battery depends on your lifestyle, device type, and personal preferences. Modern hearing aids typically use either disposable zinc–air batteries or rechargeable lithium-ion batteries, each offering distinct advantages.

Zinc–air batteries are reliable, affordable, and widely available. They provide consistent power output and come in standard sizes suited to different hearing aid models. However, they require regular replacement every few days and must be stored carefully to avoid premature activation. These batteries are ideal for people who prefer traditional devices or do not have easy access to a charging source.
Rechargeable lithium-ion batteries have become increasingly popular for their convenience and sustainability. They offer an entire day of use on a single charge and eliminate the need to handle small disposable cells, which can be challenging for users with limited dexterity. Rechargeable options also reduce waste and are cost-effective in the long term.
Ultimately, the best hearing aid battery is the one that aligns with your daily routine. If you value simplicity and eco-friendliness, rechargeable batteries may be the better choice. If you prioritize flexibility and travel often, high-quality disposable zinc–air batteries remain a dependable and practical solution.

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Rechargeable hearing aid battery types

Rechargeable hearing aid batteries mainly come in two types: lithium-ion and silver-zinc. Each uses a different technology to store and deliver power, offering distinct advantages in terms of performance, convenience, and lifespan.

1. Lithium-Ion Batteries

Lithium-ion is the most common rechargeable technology in modern hearing aids. These batteries are sealed within the device and recharged using a docking station or portable charger.

Key features:

Battery life per charge: Around 18–30 hours, depending on usage and streaming.
Charging time: Typically 3–4 hours for a full charge.
Lifespan: About 3–5 years before replacement may be needed.
Advantages: Long daily runtime, quick charging, stable power output, and no need for battery handling.
Considerations: The battery cannot be replaced by the user; servicing is required when it reaches the end of its life.

2. Silver-Zinc Batteries

Silver-zinc batteries are less common but still used in some rechargeable hearing aids.

Key features:

Battery life per charge: Like lithium-ion (about 24 hours).
Lifespan: Around 1 year, but the batteries are user replaceable.
Advantages: Environmentally friendly, safe chemistry, and recyclable.
Considerations: Requires occasional replacement and specialized chargers.

Both types offer eco-friendly alternatives to disposable batteries, with lithium-ion favored for convenience and silver-zinc for flexibility and sustainability.

How do hearing aid batteries work?

Hearing aid batteries work by converting stored chemical energy into electrical energy to power the tiny electronic components inside the hearing aid, such as the microphone, amplifier, and receiver. The way they generate electricity depends on the battery type — disposable zinc–air or rechargeable lithium-ion.

Zinc–Air Batteries

These are the most common disposable batteries for hearing aids. They contain zinc and oxygen as active materials. When you remove the protective sticker, air enters through small holes and reacts with the zinc inside the cell. This chemical reaction produces a steady flow of electricity that powers the hearing aid. How it works:

You peel off the tab to activate the battery.
Oxygen from the air reacts with zinc to create zinc oxide.
The reaction releases electrons, generating electric current.
Because the reaction relies on oxygen, zinc–air batteries only work when exposed to air and will slowly drain even when not in use.

Rechargeable Batteries

Rechargeable hearing aids usually use lithium-ion or silver-zinc technology. These batteries store and release energy through reversible chemical reactions. When charging, electrical energy is stored in the battery; when in use, the stored energy powers the hearing aid.

This design allows users to recharge the batteries daily without replacement, making them both convenient and environmentally friendly.

How to insert a hearing aid battery

Begin by peeling off the protective foil from the new battery and let it sit for about two minutes to activate. Then, carefully align the battery with the positive (+) and negative (–) markings inside the battery compartment. If the door doesn’t close easily, the battery may be inserted incorrectly.

If your hearing aid doesn’t work after replacing the battery, check the compartment for dust or debris that could interfere with the connection. Some hearing aids include a small magnetic tool to make battery handling easier.

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How to store hearing aid batteries

To keep your batteries in good condition, store them at room temperature (50°F–77°F / 10°C–25°C) in a dry place, away from direct sunlight or humidity. Never refrigerate them, and always keep them out of reach of children. When a battery runs out, remove it promptly to prevent leakage or swelling, which can damage your hearing aid.

How to dispose of hearing aid batteries responsibly

Hearing aid batteries are single-use and should not be recharged or thrown in regular waste. Take used batteries to your local audiology clinic, pharmacy, or a designated recycling collection point. Proper disposal prevents environmental contamination and ensures hazardous materials are handled safely. By disposing of batteries correctly, you help protect the environment and ensure your hearing aids continue to perform at their best.

How to extend battery life

To make disposable batteries last longer:

Turn hearing aids off when not in use and leave the battery door open overnight to let moisture evaporate.
Store batteries at room temperature and avoid hot, humid places.
Keep them in their packaging — loose batteries can short-circuit if they touch metal objects like keys or coins.