Oticon Alta

Ambient Conditions and Battery Performance

I will answer the question on the effects of temperature and humidity based on what happens when the battery is being used, not on the effects during storage. A hearing aid battery has a given operating voltage (e.g. 1.25 volts) and it is made to function until the voltage drops below its endpoint (e.g. 1.1 volts). The operating voltage of the battery changes with temperature. As the temperature gets lower the battery voltage gets lower. As the temperature gets higher the operating voltage gets higher. Therefore service life will suffer as the temperature approaches 0 and actually improve as the temperature approaches 40. This is because in the colder environment the operating voltage is closer to its endpoint and so it will run for a shorter period of time before it reaches the endpoint. The warmer environment has the opposite effect. Because the hearing aid is worn close to the body, the actual operating temperature is different from that of the ambient environment thus moderating the effects of temperature.

The zinc air hearing aid battery air holes allow the battery to interact with the environment. If the humidity is low the battery loses moisture. If the humidity stays low for a prolonged period of time it will lower the typical service life of the battery because of dry out. If the humidity is high the battery takes up moisture which fills up the internal space allotted for cell discharge, which results in a shortened service life. The overall effect of service life depends on many factors such as time and how high or low humidity is.

I cannot answer the question concerning pollution.

The simplest way to create a discharge curve is to attach a resister in series with the battery. For instance, we would take a 13 size battery and attach a 1500 ohm resistor in series to it. We then read the voltage on the battery every hour until it reaches 0.9 volts (over 300 hours later).

For more information on Rayovac, visit www.rayovac.com

Share this article


Comment

Related Content
Preferred Professionals Near You
See More Preferred Professionals

Clinics above not close enough?
Search with your zipcode below.

Sign Up for Our eNewsletter
Our free eNewsletter is delivered to your inbox every two weeks - it’s the best way to stay informed about what’s new at Healthy Hearing!
Preferred Hearing Professionals Near You

Total Hearing Care - Edison

4 Progress St Ste A1
Edison, NJ 08820

Click Here for Details

JFK Medical Center The Center for Audiology

65 James St
Edison, NJ 08820

Click Here for Details

The Hearing Center - Clark

49 Brant Ave
Clark, NJ 07066

Click Here for Details