Hearing aids are vitally important to the people who wear them, so it makes sense that hearing aid users would want to use the best batteries possible. Most hearing aids use zinc air batteries. These batteries utilize oxidized zinc from the air to power the hearing aids. They are rechargeable batteries that can come in several different sizes, though most hearing aid batteries are relatively small. They resemble buttons or coins, and as such they are often referred to as button cell or coin cell batteries. They are designed to fit small devices and are made so that they do not leak or rust inside the device. These batteries are also used in watches and are sometimes referred to as watch batteries.
The type of hearing aid battery that is right for you will depend on what kind of hearing aid you use. Cochlear implants have their own special batteries, so be on the lookout for those if you wear a cochlear implant device. If you want mercury-free hearing aid batteries, you can find those, as well. You should know that general hearing aid battery sizes are categorized by color code, which can help you when you are shopping for batteries in the event you forget your battery size. If you know what color battery you use, all you have to do is find the hearing aid batteries that have a tab that matches your color.
If you have analog (as opposed to digital) hearing aids, your batteries will last longer. Your hearing aid batteries should last at least a week. If they die before that time period, you may want to check to see if your hearing aid is defective. You should have a battery tester to make sure your batteries are working properly. Testing the batteries will give you an idea of how much longer they will last.