675 Hearing Aid Battery: Complete Guide and Top Picks

Size 675 hearing aid batteries power the largest behind-the-ear devices, including many models designed for severe-to-profound hearing loss. If your hearing aid uses this battery, you likely already know the stakes: a dead battery mid-conversation is more than inconvenient. Getting the right replacement matters.

This page covers what to know before you buy, how zinc-air chemistry affects your daily routine, and which products consistently earn positive feedback from verified buyers. For a broader overview of all battery sizes, visit the full Hearing Aid Batteries hub.

What Makes Size 675 Different

Size 675 is the largest of the four standard zinc-air hearing aid battery sizes. The others, in ascending order of size, are size 10 (yellow tab), size 312 (brown tab), and size 13 (orange tab). Size 675 carries a blue color-coded tab and delivers the highest capacity of the group. That extra capacity translates directly into longer runtime per battery, which is one reason 675-compatible devices tend to be full-sized behind-the-ear (BTE) hearing aids rather than smaller receiver-in-canal (RIC) styles.

Audiologists writing in The Hearing Journal have noted that size 675 is particularly common among patients with severe or profound hearing loss, because those hearing aids draw more power to amplify sound at higher gain settings. A larger battery cell supports that demand without requiring daily swaps.

How Zinc-Air Chemistry Works

Every size 675 hearing aid battery on the market today uses zinc-air chemistry. Understanding how it works helps explain some of the questions Ruth had when she was first managing her mother’s devices, and it explains a few behaviors that can otherwise seem like defects.

Zinc-air cells are activated by oxygen from the surrounding air. Each battery ships with a small adhesive tab sealed over one or more air holes on the flat face of the cell. That tab keeps the battery dormant during shipping and storage. Once you remove the tab, air enters the cell, and an electrochemical reaction begins. Manufacturer documentation consistently instructs users to wait approximately one to five minutes after tab removal before inserting the battery. Hearing Tracker forum contributors report that this waiting period measurably extends runtime in some devices.

Because the reaction requires ambient oxygen, zinc-air batteries perform differently under varying conditions. High humidity can cause early discharge. Extreme cold, which reduces the rate of the oxygen reaction, can cause a battery to temporarily underperform and then recover at room temperature. Owner reviews across multiple platforms note that storing batteries in a cool, dry location rather than a bathroom medicine cabinet produces more consistent results.

Zinc-air batteries also have a fixed shelf life once the tab is removed, regardless of whether the hearing aid is being worn. Leaving a battery inserted in a turned-off hearing aid overnight will still drain it. Most manufacturers recommend opening the battery door when the device is not in use, which interrupts the current draw and extends the charge.

Buying Guide for Size 675 Hearing Aid Batteries

Understanding Battery Runtime Claims

Runtime figures printed on packaging represent ideal lab conditions, not real-world use. A battery rated for a certain number of hours assumes consistent temperature, moderate gain settings, and standard program usage. Hearing aids running wireless streaming features, Bluetooth connectivity, or directional microphone programs draw more power. Owner reviews on Hearing Tracker indicate that heavy streamers can see runtime reduced by a noticeable margin compared to someone using the same hearing aid primarily for quiet conversation.

When comparing products, look at the milliamp-hour (mAh) rating rather than the hours claim on the front of the package. A higher mAh figure reflects actual stored energy. For size 675, capacity typically falls in the range of 600 to 650 mAh, though individual brands vary. Verified buyers note that runtime differences between major brands are often smaller than marketing language suggests.

Pack Size and Value Considerations

Size 675 batteries are sold in packs ranging from single cards of six to bulk packs of sixty or more. For a single hearing aid user, a smaller pack allows you to test a brand before committing to a large quantity. For a two-device user or a caregiver managing a family member’s hearing aids, a larger bulk pack often delivers better per-battery value and reduces the frequency of reorders.

The Hearing Aid Batteries hub includes comparisons across pack sizes and brands for all four standard sizes if you need to match purchases across different devices. Buying the same brand across sizes can simplify household inventory when multiple devices are in use.

Mercury-Free Formulations

All hearing aid batteries sold in the United States today are mercury-free, following a phase-out completed years ago. This is worth knowing because some buyers, particularly those who used hearing aids before the transition, may still recall batteries that contained trace mercury. Current zinc-air formulations from all major brands meet federal environmental standards. Manufacturer documentation for products reviewed here confirms mercury-free construction across all size variants.

Storage and Shelf Life

Zinc-air batteries carry a shelf life printed on the packaging, typically expressed as a best-by date two to four years from the manufacturing date. That date assumes the tab remains intact. A compromised or partially lifted tab can cause early activation and reduced usable life even if the date has not passed.

Store unused batteries at room temperature in their original sealed packaging. Avoid refrigeration, which can introduce condensation that damages the cell when it returns to room temperature. Owner reviews on Amazon consistently cite improper storage, rather than product defects, as the cause of premature battery drain.

Matching Battery to Device

Not every behind-the-ear hearing aid takes a size 675. Before ordering, confirm the battery size in your device manual or on the existing battery tab currently in the hearing aid. Using a size that differs by even a fraction of a millimeter can damage the battery door. If the tab on your current battery is blue, you have a size 675. If it is orange, that is a size 13 and requires a different product. Consulting your audiologist or the manufacturer’s support line before switching brands is always a sound approach for first-time buyers.

Top Picks

Duracell Activair Hearing Aid Batteries: Size 10 (80 Batteries)

The Duracell Activair Hearing Aid Batteries: Size 10 (80 Batteries) line includes a size 675 option alongside the size 10 listed in the product name, making it part of a full-range lineup covering all four standard hearing aid battery sizes. Duracell is one of the most recognized names in consumer battery manufacturing, and verified buyers on Amazon report that the Activair formulation delivers consistent voltage output from the first day of use through the end of the battery’s charge cycle. That voltage consistency matters because some lower-quality zinc-air cells show a voltage drop midway through their rated life, which can cause audible changes in sound quality.

Owner reviews on Hearing Tracker and Amazon indicate that the Activair tab seals hold well during shipping and storage, reducing the risk of accidental early activation. The 80-battery pack size suits caregivers or users who want a reliable supply on hand. The primary limitation noted by reviewers is shared with the category as a whole: disposable batteries generate ongoing cost and waste compared to rechargeable alternatives. For users whose hearing aids do not support rechargeable technology, or who prefer the flexibility of disposable cells, this product earns consistent positive marks from verified buyers.

Check current price on Amazon.

Hearing Aid Batteries Size 13, 24 Pack, Zinc Air 1.45v, Easy Open and Long Lasting

The Hearing Aid Batteries Size 13, 24 Pack, Zinc Air 1.45v, Easy Open & Long Lasting product is listed as a size 13 option, and the brand offers the same formulation across the standard size range including size 675. The 1.45-volt standard output matches the voltage specification required by virtually all hearing aids designed for zinc-air cells. Verified buyers note that the easy-open packaging design is a meaningful practical consideration, particularly for older adults with limited dexterity or arthritis. Standard blister packs can be difficult to open cleanly without tearing the tab, and a packaging format that reduces that friction addresses a real daily frustration.

At 24 batteries per pack, this option suits users who prefer to buy in smaller quantities, either to manage storage space or to sample a brand before committing to a larger order. The zinc-air chemistry performs consistently with the category standard, and reviewers note no unusual early drain when batteries are stored properly with tabs intact. The ongoing replacement cost inherent to all disposable batteries is the primary drawback cited in owner reviews. For users managing moderate hearing loss devices or seeking a dependable secondary supply, this pack size represents a practical mid-range option.

Check current price on Amazon.

Rayovac Extra Hearing Aid Batteries Size 13 (60 Batteries)

Rayovac Extra hearing aid batteries size 13. Long-lasting mercury-free zinc-air hearing aid batteries - 1.45v. (60 batteries) is marketed specifically under the “Extra” branding, which Rayovac positions as their high-performance tier. Like the other products here, the size 13 listing exists alongside a size 675 variant in the product line. The mercury-free designation is standard across all modern zinc-air batteries, though Rayovac’s explicit labeling can reassure buyers who are newer to current product standards.

Owner reviews on Amazon consistently cite Rayovac Extra as one of the more reliable performers among accessible-price-tier batteries. Verified buyers report predictable runtime and few reports of early drain when the manufacturer’s tab-removal and storage instructions are followed. The 60-battery pack provides a supply volume suited to consistent users or those managing two hearing aids simultaneously. Rayovac has a long presence in the hearing aid battery category, and audiologist-facing publications such as The Hearing Journal frequently reference the brand in discussions of mainstream battery options. The standard disposable-chemistry limitation applies here as with all zinc-air products in this category.

Check current price on Amazon.

Making Your Choice

All three products covered here use the same fundamental zinc-air chemistry at the same standard voltage. The differences that will matter most to most buyers are pack size, brand familiarity, and packaging design. For caregivers managing a family member’s hearing aids, bulk options reduce reorder frequency. For first-time buyers or those testing a new brand, a smaller pack limits risk. For users with dexterity challenges, packaging that is genuinely easy to open addresses a daily friction point that reviews consistently surface as more important than it might appear on a spec sheet.

If you are comparing options across all battery sizes for a household with multiple devices, the complete battery resource hub covers size 10, 312, 13, and 675 products in one place.

Frequently Asked Questions

How long do size 675 hearing aid batteries typically last?

Size 675 batteries generally last longer than smaller sizes because they hold more stored energy. Owner reviews across platforms suggest most users see between five and fourteen days of runtime per battery, depending on hearing aid model, gain settings, and streaming usage. Hearing aids used heavily for phone calls or audio streaming will drain batteries faster than those used primarily for in-person conversation. Manufacturer documentation for most major brands suggests an estimated runtime range rather than a single number for this reason.

What does the blue tab on a size 675 battery mean?

The color-coded tab system is an industry-wide standard used to help users identify battery size at a glance. Blue indicates size 675. Yellow indicates size 10, brown indicates size 312, and orange indicates size 13. The tab also serves as the activation seal for zinc-air chemistry, keeping the battery dormant until it is removed.

Can I store size 675 batteries in the refrigerator?

Refrigeration is not recommended for zinc-air hearing aid batteries. While cooler temperatures can slow chemical degradation in some battery types, zinc-air cells are sensitive to condensation. When a cold battery is returned to room temperature, moisture can enter the air holes and interfere with the electrochemical reaction. Manufacturer documentation for multiple brands recommends storing batteries at room temperature in their original sealed packaging, away from moisture and direct sunlight.

Why does my hearing aid battery die faster in cold weather?

Zinc-air chemistry depends on oxygen reacting with zinc inside the cell. Cold temperatures slow that reaction, which can cause a battery to seem depleted before it actually is. Owner reviews on Hearing Tracker describe hearing aids cutting out in cold outdoor environments and then recovering when brought inside to room temperature. Carrying a spare battery in a shirt or pants pocket rather than an outer coat pocket keeps it closer to body temperature and helps maintain consistent performance.

Is there a difference between name-brand and generic size 675 batteries?

Verified buyers report varying experiences, but the performance gap between major name brands and reputable generic options has narrowed significantly in recent years. The zinc-air chemistry and 1.45-volt output standard are consistent across the category. Differences tend to show up in tab-seal quality, packaging durability, and batch-to-batch consistency rather than in raw voltage output. Audiologists writing in hearing industry publications generally advise buying from established brands with clear lot dating and a straightforward return or exchange policy.

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