Zinc‑Air Batteries: Category Guide

At a glance

Nominal voltage	1.4–1.45 V (primary, non‑rechargeable)
Common sizes	10 (yellow), 312 (brown), 13 (orange), 675 (blue)
Typical applications	Hearing aids, select medical monitors, specialty communications
Unopened shelf life	Up to ~3 years (check date code)
After activation	Usable life is days to weeks regardless of use; keep device door open when not in use to reduce drain

How to choose the right zinc‑air battery

1) Match the size code

• Size 10 (yellow tab) — very small CIC/IIC hearing aids; typical capacity ~90–110 mAh.
• Size 312 (brown tab) — many RIC/RITE aids; typical capacity ~160–190 mAh.
• Size 13 (orange tab) — larger RIC/BTE aids; typical capacity ~280–310 mAh.
• Size 675 (blue tab) — high‑power BTE aids, some medical/communication gear; typical capacity ~600–700 mAh.

Size codes are not cross‑compatible. Use the size your device specifies. Color codes are standardized across brands.

2) Pick for runtime vs. size

• Smaller cells (10, 312) save space but run fewer days.
• Larger cells (13, 675) offer longer runtime and handle higher drain devices.

3) Consider your environment

• Dry air and high altitude can reduce performance; high humidity can shorten life or cause leakage.
• Best operating range: about 50–70% RH, 50–95°F (10–35°C).

Typical runtime in hearing aids

Estimates for moderate daily use; actual life varies with device settings, streaming, and environment.

• Size 10: ~3–7 days
• Size 312: ~5–10 days
• Size 13: ~7–14 days
• Size 675: ~9–20 days

When to choose zinc‑air vs. alternatives

Use zinc‑air if

• Your hearing aid or medical device specifies zinc‑air cells.
• You need maximum energy in a small, light battery with stable voltage.

Avoid zinc‑air if

• You need long life after opening without daily use (consider silver‑oxide for watches or lithium coin cells for remotes).
• You need a rechargeable solution (choose a device with rechargeable batteries; zinc‑air cells are not rechargeable).
• Your device is not designed for zinc‑air chemistry/voltage.

Activation and best practices

1. Wash and dry hands. Oils and moisture can block air flow.
2. Peel the tab to expose the air holes. Wait 1–5 minutes (2 minutes is a good rule) for full activation.
3. Insert with the + side up. Ensure good contact and proper orientation.
4. Open the device battery door when not in use (e.g., overnight) to reduce drain and moisture buildup.

Note: Resealing with the tab will not stop the chemical reaction once activated.

Storage and care

• Keep sealed in original packaging until use; do not store loose with metal objects.
• Room‑temperature storage (50–77°F / 10–25°C); avoid extremes, refrigerators, and bathrooms.
• Protect from moisture; use a dry case or dehumidifier if recommended for your device.
• Check the expiration date; performance declines past date codes.

Compatibility and comparisons

	Zinc‑Air	Silver‑Oxide	Lithium Coin (CR)
Nominal voltage	~1.4 V	~1.55 V	~3.0 V
Best for	Hearing aids, select medical	Watches, instruments	Remotes, trackers, sensors
After opening	Days–weeks regardless of use	No activation; normal self‑discharge	No activation; long shelf life
Rechargeable?	No	No	Some CR alternatives exist but not interchangeable without device support

Do not substitute chemistries unless your device explicitly allows it; voltage and physical dimensions differ.

Troubleshooting

• Short life after install: Wait a full 2 minutes after removing the tab; check that air holes are unobstructed.
• Intermittent power: Clean contacts; ensure the battery door closes firmly; inspect for moisture in the compartment.
• Poor performance in very dry/humid conditions: Use a hearing‑aid dehumidifier overnight; avoid direct airflow or condensation.
• Rapid drain with streaming/high gain: Expect reduced runtime; consider a larger size device if supported.

Safety and disposal

• Button batteries are a swallowing hazard. Keep away from children and pets. If ingested, seek immediate medical help.
• Do not recharge, crush, or incinerate.
• Most modern zinc‑air cells are mercury‑free. Recycle where programs exist; otherwise follow local disposal guidance.

FAQ

Which size do I need?
Use the size listed in your device manual (10, 312, 13, or 675). Color tabs help confirm the match.

How long will a battery last?
Typically 3–20 days depending on size, device power needs, streaming, and environment.

Do I need to wait after removing the tab?
Yes. Wait 1–5 minutes (about 2 minutes) before inserting to ensure full activation and stable voltage.

Can I re‑seal a battery to extend life?
No. Once activated, the chemical reaction continues even if you place the tab back on.

Should I store them in the fridge?
No. Store at room temperature in a dry place. Refrigeration can introduce condensation and harm performance.