Your essential guide to hearing aid batteries

Friday 4 August

The battery is a critical but often forgotten part of every hearing aid, providing essential power to the device. Its important Rayovac’s customers feel empowered; we do this by providing information on how to get the best performance from their batteries. Below are some common questions we are often asked.
How do my Hearing Aid batteries work?
The most common type of hearing aid batteries on the market today are zinc air hearing aid batteries. Zinc air technology uses air from the atmosphere as an active ingredient. Once the tab is removed, you can see the tiny holes in the battery; these holes are what allow air to enter the battery and power it up.
What is Air Up Time?
After the tab is removed, the battery needs a moment to catch its breath, so allow the battery to sit for 1 minute untabbed before inserting the battery into the device.
Why do I need to do this?
The reason for this is so the air has time to enter the battery and activate the zinc. Taking the tab off and immediately putting the battery in the hearing aid limits the amount of air it is exposed to. This could cause the battery to seem “dead” because the voltage could not reach the necessary level to power the device. If this happens when the battery is first put into the device, take it out and let it sit. This allows air to enter the cell and increase the voltage. After 1 minute, put the battery back into the device.
Fresh is best
Like all batteries, zinc air hearing aid batteries will slowly lose charge over time. To get the most from your batteries, purchase batteries frequently. The fresher they are the better they perform. To find out the best before date see the reverse of the pack where there is a 4 digit date code showing the best before date.
My Battery Voltage isn’t 1.45!
Whilst it says 1.45 volts on the battery package, the fact is that a tabbed voltage will measure 1.1-1.3 volts. After un-tabbing, voltage will rise enough to power a hearing aid within one minute. The cell may need up to 24 hours to rise to maximum 1.45 volts.
How long should my batteries last?
It is common for people to ask how long their hearing aid battery will last. The truth is there is no one answer that will work for everyone. In a market survey, device users were asked how long their hearing aid batteries last. The following chart shows the ranges of results. This shows that life expectancy ranges vary greatly. Therefore, no one person will have the same experience as another.
Battery Size Life Expectancy
Size - 10          3 - 10 days
Size - 312        3 - 12 days
Size 13            6 - 14 days
Size 675          9 - 20 days
There is no one answer that is going to work for all hearing aid wearers. The best way to understand the battery life is for an individual to benchmark their battery performance over a set period of time.
How should I store my batteries?
Store your hearing aid batteries at room temperature and avoid storage in hot places as this will shorten the life span, however the batteries should not be stored in the refrigerator! We recommend you store your batteries in supplied dial packs or in a battery holder and not carried loose in your pocket, often objects such as coins or keys can cause a battery to short out, leak or rupture. Store discarded batteries in places that cannot be reached by infants or children. The EPBA (European Portable Battery Association) has prepared guidance for parents to ensure they have necessary information to handle button/coin cells safely and to highlight the steps medical professionals can take should an incident occur.
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