Hearing aids are small devices that help people with hearing loss by making sounds louder and clearer. A key part of these devices is the battery, often called the “cell,” which powers the hearing aid. Without a good battery, even the best hearing aid wouldn’t work properly. In this blog, we’ll explore in detail which type of cell is used in hearing aids, covering different battery types, how they work, and why they’re important.
The Importance of Batteries in Hearing Aids
The battery is the power source of a hearing aid. It provides the energy needed to amplify sounds so that the user can hear better. The type of battery used can affect how long the hearing aid lasts before needing a recharge or replacement. It also impacts the size and design of the hearing aid, making battery choice a key consideration.
Types of Batteries Used in Hearing Aids
There are four main types of batteries commonly used in hearing aids:
- Zinc-Air Batteries
- Rechargeable Batteries
- Silver-Zinc Rechargeable Batteries
- Lithium-Ion Rechargeable Batteries
Let’s take a closer look at each one.
1. Zinc-Air Batteries
Zinc-air batteries are the most common type used in hearing aids. These are disposable batteries, meaning you use them until they run out, and then you replace them.
How They Work
Zinc-air batteries use air to produce power. They have small holes that allow air to enter and mix with zinc inside the battery, creating energy. When you buy a zinc-air battery, it comes with a sticker that covers these holes. Once you remove the sticker, air enters, and the battery starts working.
Advantages
- Long Shelf Life: When the sticker is on, these batteries last a long time in storage, so you can keep spares without worrying they’ll go bad.
- High Energy Output: Zinc-air batteries can store a lot of energy, which is great for powering hearing aids throughout the day.
- Affordable: These batteries are generally low-cost, making them a popular choice.
Disadvantages
- Single-Use: You can’t recharge these batteries, so you need to replace them regularly.
- Environmental Impact: Because they’re disposable, used batteries can pile up, which isn’t great for the environment.
2. Rechargeable Batteries
Rechargeable batteries are gaining popularity because they can be used multiple times. Instead of replacing them, you just recharge them when they run out of power.
How They Work
These batteries are usually made of lithium-ion or nickel-metal hydride (NiMH). You recharge them by placing your hearing aids in a charging station, typically overnight, so they’re ready to use the next day.
Advantages
- Convenience: No need to carry spare batteries. Just recharge them regularly.
- Cost-Effective: Although the initial cost may be higher, you save money over time since you don’t need to buy replacements.
- Eco-Friendly: Rechargeable batteries reduce waste, making them a better choice for the environment.
Disadvantages
- Higher Initial Cost: Rechargeable hearing aids can be more expensive upfront.
- Limited Compatibility: Not all hearing aids work with rechargeable batteries.
- Needs Regular Charging: If you forget to charge them, you might be left without power.
3. Silver-Zinc Rechargeable Batteries
Silver-zinc batteries are a type of rechargeable battery that is sometimes used in hearing aids.
How They Work
These batteries function similarly to other rechargeable types but are designed specifically for hearing aids. They’re compact and offer a good amount of energy for their size.
Advantages
- High Energy Density: They store a lot of energy, making them reliable for smaller hearing aids.
- Rechargeable: Like other rechargeable batteries, you can use them multiple times.
- Safe: Silver-zinc batteries are non-toxic and safe for the environment.
Disadvantages
- Shorter Lifespan: They may not last as long as lithium-ion batteries.
- Less Common: These batteries aren’t as widely available, which can make them harder to find.
4. Lithium-Ion Rechargeable Batteries
Lithium-ion batteries are well-known for their use in many electronic devices, including hearing aids.
How They Work
Lithium-ion batteries store energy using lithium compounds. They’re rechargeable and provide steady power, which is important for hearing aids that need consistent performance.
Advantages
- Long-Lasting: These batteries can last for years, so you don’t need to replace them often.
- High Energy Storage: They can hold a lot of power, so your hearing aid will last all day.
- Fast Charging: Lithium-ion batteries charge quickly, which is convenient for daily use.
Disadvantages
- Expensive: These batteries can be more costly than other types.
- Sensitive to Temperature: They don’t perform well in very hot or very cold conditions.
Battery Sizes for Hearing Aids
Hearing aid batteries come in different sizes, each with its own color code and number. The most common sizes are:
- Size 10 (Yellow)
- Size 312 (Brown)
- Size 13 (Orange)
- Size 675 (Blue)
Each size is designed for specific types of hearing aids, from the smallest in-the-ear models to larger behind-the-ear models.
Size 10 (Yellow)
These are the smallest batteries and are used in tiny hearing aids that fit inside the ear canal. They don’t last as long but are perfect for discreet hearing aids.
Size 312 (Brown)
These batteries are slightly larger and are commonly used in hearing aids that sit in the ear canal or behind the ear. They offer a good balance between size and battery life.
Size 13 (Orange)
Size 13 batteries are larger and used in bigger hearing aids. They last longer and are great for hearing aids that need more power.
Size 675 (Blue)
These are the largest batteries and are used in powerful hearing aids designed for severe hearing loss. They have the longest lifespan and are used in behind-the-ear hearing aids.
How to Choose the Right Battery for Your Hearing Aid
When selecting a battery, consider these factors:
- Compatibility: Make sure the battery fits your hearing aid model.
- Battery Life: Think about how long you want the battery to last before needing a replacement or recharge.
- Ease of Use: Choose a battery that’s easy to handle, especially if you have trouble with small items.
- Environmental Impact: If you care about the environment, rechargeable batteries might be a better choice.
- Cost: Consider the long-term cost. Rechargeable batteries can save money over time, even if they’re more expensive upfront.
Tips for Making Your Hearing Aid Batteries Last Longer
To get the most out of your hearing aid batteries:
- Turn Off When Not in Use: Turn off your hearing aids when you don’t need them to save battery life.
- Store Properly: Keep batteries in a cool, dry place and avoid extreme temperatures.
- Use Fresh Batteries: Always use new batteries, and avoid mixing old and new ones.
- Clean Battery Contacts: Make sure the battery contacts in your hearing aid are clean to maintain a good connection.
The Future of Hearing Aid Batteries
Battery technology is always improving. In the future, we can expect:
- Better Rechargeable Batteries: Longer-lasting and faster-charging batteries.
- Smaller, More Powerful Batteries: Batteries that take up less space but store more energy.
- More Eco-Friendly Options: Batteries that are even better for the environment.
Conclusion
The battery, or cell, used in a hearing aid is a vital component that powers the device, ensuring it works properly. Whether you choose zinc-air, lithium-ion, silver-zinc, or another type of battery, it’s important to pick the right one for your needs. By understanding the different options, you can make an informed choice that ensures your hearing aid performs well and lasts a long time. If you’re unsure which battery is best for your hearing aid, consult with a hearing care professional who can guide you based on your specific needs and preferences.
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