While there are rare instances that a hearing aid will use a rechargeable battery, the majority of them use one of the standard Button Cell Zinc-Air batteries. These batteries all operated at 1.35 Volts (sometimes rounded up to 1.4 Volts). Typically, one would differentiate between batteries with their size.
Here you can find answers to some of the most common questions. Hearing aid batteries are extremely valuable items, and hopefully the answers here will help you understand a little more about them.
How can I tell what battery size I need?
Some time ago, hearing aid batteries sizes were standardized and assigned with a color code system to help you remember your battery size. You can check this color on tabs found on the back of the battery. The packaging usually has the color code displayed on it, too. So, even if you can't remember your size, you can keep the color in mind.
- Yellow Tab = Size 10
- Orange Tab = Size 13
- Brown Tab = Size 312
- Blue Tab = Size 675
How long do the batteries last?
Depends on your hearing aid. Some require more power, and will drain the battery faster. Digital hearing aids generally use up batteries faster than an analog one, due to the more complicated circuitry in the digital ones.
So, while it's not definite, your battery life should range from 5 to 7 days. If you're consistently experiencing shorter life, you should be safe and have your hearing aid checked out. There's a chance that it may not be working properly. Your hearing health care professional should be able to help you out, and send in your hearing aid for repair if needed.
What happens when I take the tab off my battery?
Zinc air batteries work by mixing zinc with the outside air. When you pull the tab, the battery activates and continues to stay active. You can't deactivate the battery, so don't pull the tab if you're not ready to use it! If you keep the tabs on your battery, you should expect a shelf life of about 3 years (when stored at room temperature). After three years, the batteries probably won't perform as well as normal.
How should I dispose of hearing aid and zinc air batteries?
Easily: You can throw them away with your normal trash. You shouldn't accumulate them, though, as this can lead to a fire risk.