The functionality of a hearing aid relies entirely on a consistent power source, making battery replacement a regular and necessary skill for users. Properly replacing the small power cell ensures the device operates optimally, delivering clear sound quality throughout the day. While rechargeable options are becoming more common, many devices still rely on disposable batteries that require periodic replacement. This maintenance task helps maintain the performance and longevity of the hearing instrument.
Understanding Hearing Aid Battery Types
The majority of disposable hearing aids use zinc-air batteries, which are air-activated power cells chosen for their high energy density. This chemistry requires a factory-sealed sticker to keep the battery inactive until use. Once the seal is removed, oxygen enters tiny holes in the casing, initiating a chemical reaction that generates electrical power.
Hearing aid manufacturers utilize a universal color-coding system to simplify the identification of the four standard battery sizes. This standardized coloring is consistently applied across all major brands, providing a quick reference to ensure users select the correct power source.
- The smallest size, 10, is indicated by a yellow tab.
- Size 312 uses a brown tab.
- Size 13 batteries are marked with an orange tab.
- The largest size, 675, is designated by a blue tab.
Step-by-Step Battery Replacement Guide
Before beginning the replacement process, wash and thoroughly dry your hands to prevent transferring dirt or moisture onto the new battery or the hearing aid contacts. Clean hands protect the delicate internal components of the device. Locate the small battery door or drawer, which can usually be opened by gently prying it with a fingernail or a small magnetic tool.
Once the compartment is fully open, carefully remove the old, depleted battery and set it aside for disposal. A small magnetic stick can simplify the removal and insertion of the cell. Take the new battery and remove the protective colored sticker from the flat side, which is marked with a plus symbol (+).
After removing the sticker, allow the zinc-air battery to sit exposed to the air for one to five minutes before inserting it. This waiting period permits sufficient oxygen to enter the battery, ensuring it is fully activated. Insert the new battery into the compartment, making sure the flat side with the plus symbol faces upward or aligns correctly with the hearing aid’s orientation.
The battery door should close smoothly and easily without force. If the door does not shut without resistance, the battery is likely inserted incorrectly, and forcing it closed could damage the device. Some hearing aids emit a brief tone when the door is secured to confirm the new battery has made contact and the device is powered on.
Maximizing Battery Life and Proper Storage
To preserve battery power, turn the hearing aid off whenever it is not being worn. When the device is removed at night, the battery door should be opened fully or partially. This action breaks the electrical circuit, preventing unnecessary power drain while also allowing accumulated moisture to evaporate from the compartment.
Moisture and humidity shorten the life of zinc-air batteries and can lead to corrosion on the electrical contacts. Storing the hearing aids with the battery door open overnight helps mitigate this risk. Spare batteries should be kept in a dry environment at room temperature, as extreme heat or cold negatively affects their shelf life. Avoid storing new batteries near metal objects like coins or keys, as this contact can cause them to short-circuit and discharge prematurely.
Safe Handling and Disposal
Hearing aid batteries are small and pose a serious ingestion risk, especially to children and pets. Both new and used batteries must be stored in a secure, high location away from reach, preferably in a container with a snap-tight lid. If a battery is accidentally swallowed, immediate medical attention is required because it can cause chemical burns to internal tissues.
Once depleted, batteries should not be thrown into regular household trash. Hearing aid batteries are classified as special waste and should be taken to designated collection points for safe recycling. Many local waste management facilities, electronics stores, or audiology clinics offer recycling programs. It is helpful to cover the terminals of used batteries with a small piece of tape before disposal to prevent a short circuit.