Battery

ZA312

1.4V zinc-air button cell

ZA312 is a zinc-air hearing aid cell sold as size 312 (brown tab / PR41). Phonak maps Audéo L-312 and Bolero M-M to size 312. Pack brand does not change the size. Not interchangeable with 10, 13 or 675.

Chemistry: zinc_air
Voltage: 1.4 V
Diameter: 7.9 mm
Thickness: 3.6 mm
Used by: 2 devices

Common uses: Hearing aids

ZA312 Diagram

Brand-neutral outline — confirm the tray in your device.

Important

Hearing aids are medical devices. Use only the size and type your audiologist or manufacturer specifies. Zinc-air size codes do not fit every aid, and they are not substitutes for sealed rechargeable systems. Keep button and zinc-air cells away from children and pets; swallowed cells are a medical emergency. This page is a size guide — not a fitting or clinical recommendation.

Other names

Genuine aliases and pack labels for this battery — not substitutes of a different chemistry.

PR41 · 312 · brown

Related codes

Commonly confused with

ZA312ZA10

Not a substitute

Different hearing-aid size — not interchangeable

ZA312ZA13

Not a substitute

Same diameter family but different height — not interchangeable

Size family

Edge thickness in the 7.9 mm family — thicker bar means thicker cell. Not to scale. Highlighted cell is this page.

3.6 mm

3.6 mm

3.6 mm

5.4 mm

Device-specific caveats

From manufacturer-backed notes on devices that use ZA312 — not generic advice.

Disposable zinc-air only — not for Phonak sealed rechargeable models.
Keep zinc-air / button cells away from children and pets; swallowed cells are a medical emergency.

Devices using ZA312

All (2)Hearing aids (2)Phonak (2)

Used in

Hearing aids2 devices

Brands: Phonak

Learn more

Testers & chargers

Optional tools that fit this cell type — only where the chemistry allows. Separate from the battery answer.

Amazon links may earn us a commission. They do not change the battery answer.

Coin cell / button cell battery tester
Quick check of CR / LR / SR button and coin cells before fitting
Buy on Amazon More tools
ZTS Mini-MBT Multi-Battery Tester
More informative state-of-charge style checks across common formats
Docs Buy on Amazon More tools
BT-168D-class digital battery tester
Budget household go/no-go checks
Buy on Amazon More tools

Coin / button cell tester
Quick check for CR / LR / SR coin cells
Open-circuit voltage alone does not prove remaining capacity.
How to test a coin cell Buy on Amazon

Buy links are optional and separate from the battery answer.

Need one?

Need a ZA312?

Search Amazon for packs of this battery code.

Buy on Amazon Amazon UK

Buy links go to Amazon (Associates where tagged) or other affiliate programmes when available. They never change the battery answer.

Notes

Zinc-air hearing aid size 312 (brown tab / PR41). Size hub: /resolve/hearing-aid-batteries. Not interchangeable with 10/13/675.