Hearing aid batteries power the microphone and other electronic components of hearing aids. They operate continuously at full power until they are fully drained, unlike regular batteries which gradually lose power over time. They are usually installed in a small compartment in the hearing aid and typically last five to 20 days.
Kinds of Hearing Aid Batteries include the following:
Mercury batteries
Mercury batteries use mercuric oxide mixed with other chemicals to produce current. They have a power output of 1.4 to 1.55 volts, and have a shelf life of up to ten years. They are banned in many areas because the mercury content is poisonous and poses environmental hazards.
Zinc-air batteries
Zinc-air batteries produce current from oxidized zinc. They have a lower shelf life and a power output of 1.4 to 1.35 volts. They are traditionally non-rechargeable, but may be mechanically recharged by melting the zinc oxide and remixing it with the electrolyte.
Size: Hearing aid batteries come in various sizes to fit different types of hearing aids. Make sure your battery fits properly into your hearing aid’s compartment. The smallest batteries are sized #5 to #10 and are best for completely-in-canal (CIC) hearing aids, while larger ones are marked #675 and will fit into behind-the-ear (BTE) models.
Shelf life: Choose a hearing aid battery with a long remaining shelf life. Batteries tend to deteriorate in power even when stored. Check the manufacture and expiry dates to determine the remaining shelf life of the battery.
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