GN Hear & Now

RESOUND EXPERT

​OLIVIA'S UPDATE

6 IMPORTANT FACTORS THAT INFLUENCE BATTERY LIFETIME

​It’s a popular talking point in our industry – how long will a hearing aid battery last?  Many clients are surprised at the short lifespan of hearing aid batteries, but it is important to remind them that these batteries are powering sophisticated technology! There are several factors that determine the life of a hearing aid battery.  Below we review 6 important factors and why battery lifetime can be so variable.

Factor #1: The Extent of the Individual’s Hearing Loss
As the severity of an individual’s hearing increases, the more amplification is required. This increased amplification requires greater power, which in turn reduces battery life.

Factor #2: The Size of the Battery
Hearing aids are becoming smaller and smaller to meet the demands for more discreet, cosmetically appealing instruments.  However, small hearing aids come at a price. They require small batteries and the smaller the battery, the shorter the battery life.  The reason for this is that small batteries include fewer components than large batteries, which impacts how long the battery can last.

Factor #3: An individual’s hearing aid usage
•    How many hours a day do they wear their hearing aid?
•    How many days a week do they wear their hearing aid?
The more usage a hearing aid gets, the shorter the life of the battery.

Factor #4: The Features activated
Today’s hearing aids are feature packed and each feature has different power demands for a battery. Features like noise cancellation and multi-channel processing can reduce battery life by 20%. Other premium features like FM, Tinnitus Sound Generators and Wireless/Bluetooth streaming can increase the current and shorten battery life.

Factor #5: The Environment
Humidity, temperature and altitude all have an effect on how long a battery will last.
•    As humidity is reduced, batteries can dry out reducing battery life
•   As humidity increases, batteries may take on moisture, interfering with the natural discharge     expansion, resulting in swelling/leakage and reducing battery life
•    As temperature is reduced, hearing aid battery voltage is lowered and reaches functional end     point earlier, reducing battery life
•    As altitude increases, the percentage of oxygen level in the air is reduced, lowering the hearing aid battery voltage, causing the battery to reach the endpoint earlier, reducing battery life.

Factor #6: Battery Life Expectancy
Batteries have ranges of expected life (in days) depending on the size of the battery. On average you could expect:

It is important to note that there are some quality differences in hearing aid battery brands.

The bottom line is that there is no one answer that is going to work for all hearing aid wearers. The best way for your clients to understand the battery life that they can expect, is to benchmark their individual battery performance over time.