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Hearing Aid Batteries

Hearing aid batteries are most often made of zinc-air batteries. The difference between these batteries and regular ones is that air acts as the primary cathode reactant. Since it is using air as the reactant, instead of alkaline, silver or mercury in standard batteries more zinc (fuel) can be put into the battery which allows it to last up to five times longer than a comparably sized regular battery.

Zinc-air batteries are especially suited for hearing aid batteries because they last a long time, which is important because most hearing aids are continuously on for an average of 16 hours a day. They also completely discharge with almost no change in voltage until the battery is exhausted, which means that volume and power levels will remain constant until it is time to replace the battery.

Another advantage to using zinc-air hearing aid batteries is that zinc is non-toxic and very cheap. The price usually stays at about $1000 per ton of zinc. There is almost no risk of these types of batteries blowing up due to built up pressures inside or heat because they already contain many holes to allow the zinc to react with air. The safety and efficiency make these great batteries for smaller applications that require low, constant power.

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