Hearing Aid Battery Types and Sizes: A Comprehensive Guide

Hearing aids have revolutionized the lives of millions of individuals with hearing impairments, enabling them to communicate and engage with the world around them more effectively. These small electronic devices rely on batteries to power their advanced features and deliver clear and crisp sound. Understanding the various hearing aid battery types and sizes is essential for users and professionals alike to ensure optimal performance and longevity of these valuable devices. In this comprehensive guide, we will delve into the different types and sizes of hearing aid batteries, their characteristics, pros and cons, and tips for maximizing their lifespan.

Understanding Hearing Aid Battery Types

Hearing aid batteries come in four primary types, each defined by its chemical composition: zinc-air, zinc-air mercury-free, silver-zinc, and lithium-ion. Let’s explore each type in detail:

1. Zinc-Air Batteries

Zinc-air batteries are the most common type used in hearing aids due to their reliable performance and relatively low cost. They are air-activated and come with a tab that covers tiny holes on the battery’s surface. When the tab is removed, oxygen in the air interacts with zinc inside the battery, causing a chemical reaction that generates electrical power.


  • Widely available and economical.
  • Long shelf life when the tab is intact, making them suitable for storage.


  • Once the tab is removed, the battery starts to discharge, even if it is not in use.
  • Users need to plan ahead to ensure the battery is active when needed.

2. Zinc-Air Mercury-Free Batteries

Zinc-air mercury-free batteries function similarly to standard zinc-air batteries but do not contain mercury, making them more environmentally friendly. Due to the absence of mercury, they may have a slightly shorter shelf life compared to their mercury-containing counterparts.


  • Environmentally friendly and safe for disposal.
  • Provide reliable power for hearing aids.


  • The same issue as standard zinc-air batteries, discharging after the tab is removed.

3. Silver-Zinc Batteries

Silver-zinc batteries are rechargeable and utilize a combination of silver oxide and zinc as their active components. They offer a higher energy density than zinc-air batteries, making them suitable for powerful and feature-rich hearing aids.


  • Rechargeable, reducing the need for frequent battery replacements.
  • High energy density provides longer-lasting power.


  • Costlier upfront due to the need for a charger.
  • Battery life may decrease over time with frequent charging.

4. Lithium-Ion Batteries

Lithium-ion batteries are becoming increasingly popular in hearing aids for their high energy density and extended lifespan. These batteries are rechargeable and can be used in various hearing aid models.


  • Longest lifespan among all hearing aid battery types.
  • Quick recharge times and high energy density.


  • Higher initial cost due to the need for a charging solution.

Hearing Aid Battery Sizes


Hearing aid batteries come in standardized sizes, denoted by numbers and colors. The four most common sizes are 10, 312, 13, and 675, each catering to specific hearing aid styles and power requirements.

1. Size 10

Size 10 batteries are the smallest among the standard sizes and are often used in completely-in-the-canal (CIC) hearing aids. Despite their compact design, they deliver a decent lifespan and are suitable for individuals with mild to moderate hearing loss.

2. Size 312

Size 312 hearing aid batteries are slightly larger than size 10 and are compatible with in-the-canal (ITC) and some behind-the-ear (BTE) hearing aids. They offer a balance between size and power, making them suitable for a wide range of hearing aid styles and hearing loss levels.

3. Size 13

Size 13 batteries are larger and commonly used in behind-the-ear (BTE) and in-the-ear (ITE) hearing aids. They provide more power and are ideal for individuals with severe hearing loss or those using hearing aids with advanced features.

4. Size 675

Size 675 batteries are the largest among the standard sizes and are used in powerful behind-the-ear (BTE) hearing aids with significant amplification requirements. Due to their size, they have the highest capacity and are suitable for severe to profound hearing loss.

Tips for Maximizing Hearing Aid Battery Life

Regardless of the type and size of hearing aid batteries, users can follow these tips to prolong their lifespan and optimize performance:

1. Store Batteries Properly

If you have spare hearing aid batteries, store them in a cool, dry place away from direct sunlight. Keeping the battery tab intact until use can help preserve its charge.

2. Turn Off Hearing Aids When Not in Use

If your hearing aids are not in use, turn them off or open the battery compartment to interrupt the power supply and prevent unnecessary battery drain.

3. Keep Batteries Clean

Ensure that the battery contacts and the contacts inside the hearing aid are clean and free from dirt or corrosion. Use a dry, soft cloth or a cotton swab to clean them if necessary.

4. Invest in Rechargeable Batteries

For hearing aid users with compatible devices, consider investing in rechargeable batteries. While they may have a higher upfront cost, they can save money in the long run and are more environmentally friendly.

5. Follow Manufacturer Recommendations

Always follow the manufacturer’s guidelines regarding battery usage and replacement. Different hearing aids may have specific power requirements and battery recommendations.

Hearing aid batteries are essential for powering the devices that enhance the hearing and quality of life for individuals with hearing impairments. Understanding the different types and sizes of hearing aid batteries can help users make informed decisions about their hearing aids’ performance and maintenance. Whether you choose zinc-air, silver-zinc, or lithium-ion batteries, proper storage and usage are critical to ensure prolonged battery life and optimal hearing aid performance. By following the tips provided and seeking professional guidance, hearing aid users can enjoy the benefits of these life-changing devices for many years to come.