Battery Considerations for Hearing Aids

  • The smaller the hearing aid, the smaller the battery and the more difficult it is to handle both the battery & the hearing aid.
  • The smaller the battery, the shorter the battery life.
  • The stronger and more complex the hearing instrument’s amplification, the faster the battery drain and the shorter the battery life.
  • If you have difficulty seeing or handling small objects like tiny batteries, ask your audiologist about the availability of rechargeable batteries.

BatterySizes and Color Coding

It is important to know the right size of batteries needed for your hearing aid.  Batteries are color coded according to size.  The color coding makes it easier to find the right size when shopping.

Size 10           YELLOW       Very Small   
Size 312        BROWN        Medium Small
Size 13           ORANGE       Medium Large
Size 675        BLUE             Large                                                

Note that the battery sizes do not go in numerical order!


Batteries are dangerous when swallowed!  

  • If swallowed, call the National Button Battery Ingestion Hotline at (202) 625-3333(voice) or (202) 362-8563 (TTY).  It is a special poison control center for those who swallow batteries.  You can call it collect.
  • Be safe: Seek medical assistance from a gastroenterologist or emergency room when someone swallows a battery.
  • Never leave batteries unattended where children or pets can play with them or eat them. 
  • Old fashioned mercury batteries will not work properly in modern, digital hearing aids.  Mercury is toxic to the environment, so they are not sold any more for use in hearing aids.  Only use Zinc Air batteries.  Zinc Air batteries still contain a tiny amount of mercury, so they should be kept away from children and animals who might swallow them.
  • Batteries labeled “Mercury Free” will only work if they are 1.45 volts.  Mercury free batteries that are 1.4 volts will not work properly in a digital hearing aid.  Regular Zinc Air batteries (not "mercury free") will work best and have a longer battery life than Mercury Free batteries.  Regular Zinc Air batteries are 1.4 volts, which work fine in digital hearing aids.
  • Consult your local waste disposal authority regarding recycling options for batteries.