Most hearing aids are rechargeable; however, some do require the use of batteries. These disposable zinc-air batteries are color- and number-coded for easy replacement. The type of battery needed depends on the style and size of your hearing aids, and includes 5 (red), 10 (yellow), 13 (orange), 312 (brown) and 675 (blue).
Zinc-air batteries require oxygen to produce power. They come with a protective seal on the back; once this is removed, oxygen enters through tiny holes to activate them. You should wait at least a minute before inserting your batteries to ensure they have absorbed enough oxygen to work properly.
Store your batteries at room temperature and avoid exposing them to moist or humid environments. This includes the refrigerator – despite what you may have heard, this is not a good place to keep your batteries as temperature extremes and condensation can shorten their life. Keep batteries away from keys, coins and other metal objects that can cause them to short circuit or discharge. When removing your hearing aids, turn off the hearing aids by opening the battery door to prevent excess moisture and battery drain.