Hearing Aid Batteries: Types, Lifespan, and How to Choose the Right One

When your hearing aid batteries, small power sources that keep your hearing device running daily, typically using zinc-air chemistry. Also known as zinc-air batteries, they’re not like regular AA or AAA cells—they’re designed for low power over long periods and activate only when you remove the tab. If you’ve ever run out of power mid-day or paid too much for replacements, you’re not alone. These tiny batteries are the unsung heroes of hearing health, and getting them right matters more than you think.

Not all hearing aid batteries, small, disposable power units specifically engineered for hearing devices. Also known as zinc-air batteries, they’re designed for low power over long periods and activate only when you remove the tab. are the same. They come in four standard sizes—10, 13, 312, and 675—each color-coded and sized for different hearing aid models. Size 10 is the smallest, used in tiny in-the-canal devices, while size 675 powers larger behind-the-ear units. Using the wrong size won’t just fit poorly—it won’t work at all. Many people buy the wrong size because they assume all batteries are interchangeable. They’re not. Always check your hearing aid manual or the label on your old battery before buying new ones.

Battery life, how long a hearing aid battery lasts before needing replacement, typically ranging from 3 to 14 days depends on your device’s power needs, how many hours you wear it, and whether you use features like Bluetooth or noise reduction. If you’re going through a battery every three days, you might be using a high-drain model or leaving the battery door open at night. Keeping the door open when you’re not using your hearing aid lets air out and stops the battery from draining unnecessarily. That simple habit can add days to each battery’s life.

There’s a lot of confusion around rechargeable options. Many modern hearing aids now come with built-in rechargeable batteries, which eliminate the need for disposable ones entirely. But if you’re still using disposables, don’t fall for gimmicks like battery extenders or DIY tricks. The only proven way to save money is to buy in bulk from reputable sellers. Store your batteries in a cool, dry place—never in the fridge. Moisture and heat kill them faster. And never carry loose batteries in your pocket with keys or coins; they can short-circuit and leak.

If you’ve ever stared at a dead hearing aid wondering if it’s the battery or the device, you know how frustrating it is. The easiest fix? Always keep a few spare batteries on hand. Keep one in your hearing aid case, one in your purse or wallet, and one at work. Test them with a battery tester if you have one—don’t just guess. A weak battery can sound like your hearing aid is broken, when all it needs is a fresh one.

The market is full of cheap generic brands, but not all are created equal. Some deliver inconsistent power, leading to sudden dropouts or distorted sound. Stick to trusted names like Rayovac, PowerOne, or Energizer. They’re not much more expensive, and the difference in performance is real. Your hearing is too important to risk on unreliable power.

Knowing your battery type, how long it lasts, and how to stretch its life isn’t just about saving money—it’s about staying connected. Whether you’re talking to family, hearing the doorbell, or catching a conversation in a café, that little battery is what keeps you in the loop. The posts below cover everything from how to replace them safely to why some last longer than others, and what to do when your hearing aid suddenly goes quiet—even with a fresh battery.