Hearing aids rely on a consistent power supply, typically disposable zinc-air batteries, which require periodic replacement to maintain clear sound amplification. Understanding the proper procedure for changing these cells is important for device longevity and consistent performance. This guide provides detailed instructions for safely and effectively replacing your hearing aid batteries.
Identifying Battery Types and Preparation
Hearing aid batteries are classified into four standard sizes, each assigned a specific number and color code. Size 10 is yellow, size 312 (the most common) is brown, size 13 is orange, and size 675 (the largest) is blue. Always confirm the correct size designated by your hearing aid manufacturer before purchasing replacements.
Zinc-air cells rely on oxygen from the atmosphere to activate the electrochemical reaction that generates power. Each new battery comes sealed with a protective tab that prevents air from entering the cell prematurely. The tab should only be peeled off immediately before you intend to use the battery.
After removing the protective seal, allow the cell to “air up” for one to two minutes before insertion. This waiting period allows oxygen to fully enter the perforations and ensures the cell is completely activated. Avoid touching the battery surface with bare fingers, as oils and moisture can clog the air holes and interfere with the chemical reaction.
Step-by-Step Battery Replacement Guide
Ensure your hearing aid is switched off before beginning the replacement process. Locate the small battery door, which may swing out or open with a latch depending on the model. Carefully open the door fully until the old battery is accessible in its compartment.
Remove the old cell by tilting the device to let it fall out, or by using a small magnetic tool designed for this purpose. Once the dead battery is removed, prepare the new, activated battery for insertion. Note the orientation of the compartment, which often has a plus sign (+) indicating the correct direction for the positive terminal.
The positive side of a zinc-air battery is typically the flat side without the circular perforations. Slide the new cell into the compartment, ensuring the positive terminal aligns with the symbol in the tray. The battery should sit securely and flush within the compartment without requiring excessive force.
Gently push the battery door closed until it clicks or latches into place. Never force the door, as this can damage the delicate hinges or the internal battery contacts. Finally, switch the hearing aid back on and check for the typical start-up chime or indicator light to confirm the new power source is working correctly.
Troubleshooting and Safe Disposal
If the hearing aid does not turn on after replacing the battery, check the cell’s orientation first. Reversing the positive and negative ends prevents the circuit from completing. Ensure the battery door is completely and securely closed, as a partially open door will break the connection. If necessary, gently clean moisture or corrosion inside the compartment with a dry cotton swab or specialized brush. If the device still fails to operate, consult a hearing professional.
Proper disposal of used zinc-air batteries is important for environmental safety. These cells should not be placed in household trash because they are considered special waste. While most modern hearing aid batteries are mercury-free, they still contain other metals that should be recycled responsibly.
Collecting used batteries in a dedicated container and taking them to a local battery recycling center, pharmacy drop-off point, or your audiologist’s office ensures safe disposal. Always store both new and used batteries out of reach of children and pets, as these small, button-style cells pose a serious choking hazard and can cause internal injury if swallowed.