How long should a hearing aid battery last?

Size 312 hearing aid batteries are among the most commonly used battery types for behind-the-ear (BTE) and in-the-ear (ITE) hearing aids. Recognised by their distinctive brown packaging, these zinc-air batteries offer a balance of compact size, solid performance, and reliable power output—making them a popular choice for everyday users.

One of the main benefits of size 312 batteries is their compact design, which suits smaller hearing aids without compromising power. This makes them ideal for individuals seeking discretion, particularly those using smaller ITE or RITE (receiver-in-the-ear) devices.

In terms of battery life, size 312 models typically last between 3 to 10 days, depending on hearing aid features, user habits, and environmental conditions. While not the longest-lasting option, they provide a dependable level of performance for users with moderate hearing loss or those who use their hearing aids throughout the day.

Another key advantage is the wide availability of size 312 batteries. As a standard size across many brands and devices, they are easy to find at pharmacies, hearing care providers, and online retailers. Most are also mercury-free, making them safer for the environment and compliant with modern health regulations.

Size 312 batteries also benefit from zinc-air technology, which delivers a stable voltage output. This ensures consistent hearing aid performance from the moment the battery is activated until it runs out.

Size 13 hearing aid batteries are a popular choice for users who require more power and longer battery life. Identified by their orange-coloured packaging, these zinc-air batteries are widely used in behind-the-ear (BTE) and in-the-ear (ITE) hearing aids, particularly those designed for moderate to severe hearing loss.

One of the key advantages of size 13 batteries is their extended battery life. Compared to smaller sizes, such as size 10 or 312, size 13 batteries typically last up to 10–14 days, depending on hearing aid features and daily usage. This makes them ideal for users who wear their devices for long hours each day or who rely on advanced functions such as wireless streaming, Bluetooth connectivity, or noise reduction.

Their larger size also makes them easier to handle, especially for individuals with reduced dexterity or visual impairments. This can be particularly helpful for older adults who may find smaller batteries challenging to insert and replace.

Size 13 batteries are also widely available, compatible with a broad range of hearing aid models, and often come in mercury-free versions, making them safer for both users and the environment.

Thanks to stable voltage output from zinc-air technology, size 13 batteries support consistent hearing aid performance, even when powering more demanding feature

Size 10 hearing aid batteries are one of the smallest and most commonly used types, easily recognised by their yellow-coloured packaging. These compact zinc-air batteries are primarily used in completely-in-the-canal (CIC) and in-the-canal (ITC) hearing aids, where space is limited and discretion is key.

The main benefit of size 10 batteries is their small size, which allows them to fit comfortably into the tiniest hearing aid models. This makes them ideal for individuals who prioritise a discreet appearance, especially those using nearly invisible hearing solutions.

Despite their size, these batteries offer a dependable power source for mild to moderate hearing loss. They deliver consistent performance and are designed to work with devices that may not require high power output or extended connectivity features.

Size 10 batteries typically last 3 to 7 days, depending on how long the hearing aid is worn each day and whether features like wireless streaming or noise reduction are used. Although their battery life is shorter than larger sizes, their lightweight and convenient design often outweighs the need for longer runtime, especially for users who value comfort and aesthetics.

Another advantage is their availability—they are widely sold in pharmacies, hearing care centres, and online, and are often manufactured mercury-free, making them safer and more environmentally friendly.

These are small, button-style batteries activated by air. They begin to discharge once the protective tab is removed. Battery life varies depending on the size

• Size 10 (yellow): 3–7 days
• Size 312 (brown): 3–10 days
• Size 13 (orange): 6–14 days
• Size 675 (blue): 9–20 days

Usage habits also play a key role. Streaming audio via Bluetooth, using high amplification levels, or wearing the aid all day can shorten battery life. Environmental factors like humidity and temperature can also affect performance.

• Most modern rechargeable hearing aids use lithium-ion technology. These typically offer:
• One full charge: 20–30 hours of use
• Recharge time: Around 3–5 hours
• Battery lifespan: 3 to 5 years before needing replacement

The longest-lasting hearing aid batteries fall into two main categories: disposable (zinc-air) and rechargeable (typically lithium-ion). Each has different definitions of “battery life” — either per use or total lifespan.

1. Disposable Zinc-Air Batteries

These batteries are measured by hours or days of use. The largest size, Size 675 (blue), offers the longest duration per battery. Size 675 battery life:

• Typically 9–20 days of use per battery, depending on the hearing aid model and usage habits.
• This is the longest daily-use lifespan among disposable types.
• It’s commonly used in powerful behind-the-ear (BTE) aids for users with severe or profound hearing loss.
• However, these batteries must be replaced regularly and start draining once the tab is removed.

2. Rechargeable Batteries (Lithium-Ion)

Rechargeable hearing aids are charged daily, but the battery itself lasts much longer:

• Single charge lifespan:
• Usually 20 to 30 hours, depending on streaming and amplification.
• Battery lifespan:
• Typically 3 to 5 years before needing replacement.
• Some users report up to 6 years of usable performance with proper care.

Rechargeable hearing aids are ideal for users who want convenience and long-term reliability without frequently handling small batteries.

Smaller batteries have less capacity. For example:

• Size 10 (yellow): lasts about 3–7 days
• Size 312 (brown): 3–10 days
• Size 675 (blue): 9–20 days

If you're using a high-power hearing aid with a smaller battery, it may drain faster than expected.

• Temperature, humidity, and altitude can affect battery performance:
• Cold weather can reduce battery efficiency
• High humidity may cause corrosion
• High altitudes decrease oxygen levels, which zinc-air batteries need to work

• Removing the tab and inserting the battery immediately doesn’t give it time to “activate” (wait 1–2 minutes)
• Leaving the battery in an unsealed hearing aid overnight can cause slow drainage
• Touching the battery with oily or wet fingers can interfere with contact points
• Storing batteries near metal objects (keys, coins) can short-circuit them

• Zinc-air batteries are activated by exposure to air. Once the sticker is removed, oxygen enters the battery through tiny holes and starts a chemical reaction that produces power.
• Waiting 5 minutes allows the battery to fully absorb enough oxygen to reach its optimal charge.
• Inserting it too quickly can lead to incomplete activation, resulting in shorter battery life—sometimes by up to 2–3 days less than expected.

1. Remove the tab from the new battery.
2. Place the battery on a clean surface, label side up.
3. Wait at least 5 minutes to allow oxygen to fully activate it.
4. Insert it into your hearing aid.

These devices usually have no battery door. They take around 3–4 hours to reach a full charge, which generally provides about 24 hours of use. The internal battery is designed to last for the lifetime of the hearing aid, typically between four and five years. Once depleted, you can either replace the device or have the battery replaced by the manufacturer.

To maintain lithium‑ion batteries:

• Always place your aids in the charging station when not in use—even if they’re not fully discharged. Contrary to older battery types, constant charging does not harm the device; in fact, it helps maintain battery health.
• Never store the aids in an unplugged charger, as this gradually drains the battery and diminishes lifespan.
• For long periods without use, switch the devices off and store them safely rather than relying on a powerless charger.

• These typically feature a small battery door. Charging also requires about 3–4 hours and yields around 24 hours of use, but the battery typically lasts only about a year—replacement via an audiologist is necessary after this period.
• Care recommendations mirror those for lithium‑ion models, except that you should not open the battery door when the aids are unused, as doing so can reduce battery health. If unable to charge for more than three hours, remove the batteries and store them carefully—avoiding contact with metallic objects or each other.

As mentioned earlier, there’s no fixed rule for how long hearing aid batteries will last. Battery life varies depending on the specific device you use and your daily habits. The most effective way to gauge your battery usage is to monitor your device’s performance over time.

• One simple method is to keep a log of when you insert a new battery and when it stops working. By doing this consistently, you'll start to recognise patterns in battery life based on your usage. This will help you plan ahead and know when it’s time to buy a new pack. It’s also wise to always carry spare batteries with you to avoid being caught out unexpectedly.
• Though small in size, zinc-air hearing aid batteries store a substantial amount of power. With a few mindful practices, you can make them last even longer and get the most out of your hearing aids.
• Proper storage, careful handling, and regular maintenance of your hearing device all contribute to improved battery performance. By adopting these habits, you'll not only extend the life of your batteries but also ensure your hearing aids continue to work efficiently and reliably throughout the day.

To get the best performance from your hearing aid batteries, proper storage is essential. Zinc-air batteries should always be kept in a cool, dry environment. Exposure to extreme heat or cold can shorten their shelf life, so avoid storing them near heaters, windows, or in the refrigerator.

• If you need to remove batteries from their original packaging, don’t leave them loose in bags or pockets, as this can cause physical damage or a short circuit. Instead, use a battery holder or caddy, which is specifically designed to protect and organise spare batteries safely. These are available from most hearing aid brands as part of their accessories.
• Leave the protective tab on the battery until just before you use it—removing the tab activates the battery by exposing it to air. Wait about a minute after removing the tab before placing the battery in your hearing aid to allow the air to fully activate it.
• When handling batteries, make sure your hands are clean and dry. Oils, dirt, or moisture can interfere with performance and reduce battery life.
• Always keep batteries and hearing aids out of the reach of children and pets. While many batteries are now mercury-free, they still contain zinc and can be harmful if swallowed. If accidental ingestion occurs, seek medical advice immediately.
• Storing and handling your batteries correctly not only improves their performance but also helps ensure your hearing aids work reliably when you need them.

If you won’t be using your hearing aid for a while, it's a good idea to remove the battery. Reattaching the tab will help seal the battery and prevent air from entering, which helps preserve its charge. Additionally, leaving the battery door open allows moisture to escape, helping to reduce the risk of condensation and extending the battery's overall life.

• If you use a hearing aid drying box or dehumidifier, never place the batteries inside. Excessive drying can negatively affect battery performance and shorten their usable life.
• When you're ready to use your hearing aid again, simply remove the battery tab and insert it as usual. Give the battery a minute to activate before placing it into the device.
• It’s also important to regularly clean your hearing aid. Dirt, dust, and moisture can all interfere with both the device’s performance and the efficiency of the battery. Always ensure your hands are clean and dry when handling either the hearing aid or the batteries.
• Keep your device and batteries away from cosmetic or skincare products such as creams, perfumes, hair sprays, and oils. These substances can clog small components and affect functionality.
• Finally, avoid wearing your hearing aid in damp or wet environments, including the bath, shower, swimming pool, sauna, or steam room. High moisture levels can damage both the hearing aid and its battery, leading to reduced performance or malfunction.

• When travelling by air, it’s best to pack your hearing aid batteries in your carry-on luggage, rather than in checked baggage. This ensures they stay protected from extreme temperatures in the cargo hold and are easily accessible in case your checked luggage is delayed or lost.
• Spare batteries should be stored in their original packaging or placed in a battery caddy or protective case. This prevents them from being damaged or short-circuited during travel. Using a designated case also helps airport security quickly identify them, making the screening process smoother.
• It’s perfectly safe to wear your hearing aids during security checks. You don’t need to remove them for X-ray machines or metal detectors, although you can inform a security officer if you’d prefer a manual inspection or require assistance.
• Make sure any loose batteries are kept in a secure container and not left rolling around in pockets or bags. This avoids accidental activation or contact with metal objects that could drain the battery or cause it to overheat.
• In summary, always carry spare hearing aid batteries in your hand luggage, keep them in appropriate packaging, and use a protective case to ensure they stay safe and functional throughout your journey. These simple precautions will help you travel with confidence and ensure you’re never caught without power for your hearing aids.

If you use NHS-issued hearing aids, you are entitled to free replacement batteries through your local NHS audiology service. These batteries can usually be collected in person or ordered by post, depending on your location and mobility.

• To collect batteries in person, visit the audiology clinic, GP surgery, or health centre where your hearing aids were fitted. You will typically need to bring your NHS battery card or service booklet (sometimes referred to as a “brown book”). Some NHS trusts also allow collection from designated sites such as libraries or community health hubs. Opening times and availability can vary, so it’s best to check with your local service in advance.
• If you are unable to travel, many NHS audiology departments offer a postal delivery service. You may need to send a self-addressed stamped envelope along with your name, date of birth, and battery card details. Some regions have online forms for requesting batteries, and delivery generally takes up to a week.
• Only patients who received their hearing aids through the NHS are eligible for free batteries. Those with private hearing aids must purchase their own batteries from pharmacies or hearing care providers.
• Good storage and regular battery replacement help keep your hearing aids working efficiently. If you’re unsure where to collect batteries or how to request them, contact your audiology department directly. In some cases, a relative or carer may collect batteries on your behalf if they have the proper identification and battery card. Keeping your supply topped up ensures your hearing aids remain reliable day to day.

• If you won’t be using your hearing aid for a while, it's a good idea to remove the battery. Reattaching the tab will help seal the battery and prevent air from entering, which helps preserve its charge. Additionally, leaving the battery door open allows moisture to escape, helping to reduce the risk of condensation and extending the battery's overall life.
• If you use a hearing aid drying box or dehumidifier, never place the batteries inside. Excessive drying can negatively affect battery performance and shorten their usable life.
• When you're ready to use your hearing aid again, simply remove the battery tab and insert it as usual. Give the battery a minute to activate before placing it into the device.
• It’s also important to regularly clean your hearing aid. Dirt, dust, and moisture can all interfere with both the device’s performance and the efficiency of the battery. Always ensure your hands are clean and dry when handling either the hearing aid or the batteries.
• Keep your device and batteries away from cosmetic or skincare products such as creams, perfumes, hair sprays, and oils. These substances can clog small components and affect functionality.
• Finally, avoid wearing your hearing aid in damp or wet environments, including the bath, shower, swimming pool, sauna, or steam room. High moisture levels can damage both the hearing aid and its battery, leading to reduced performance or malfunction.