Canonical battery record · checked 2 September 2026

PR41 / size 312

PR41 / size 312 is an air-activated zinc-air family. Colour tabs are a shopping aid, not proof of compatibility.

PR41312PR312AC312

Answer

PR41, 312, PR312, AC312 are the supported exact aliases for one 7.9 × 3.6 mm zinc-air button cell. No other family is treated as an automatic replacement.

Top profile · Ø 7.9 mm

Side profile · 3.6 mm high

Original proportional profiles. Scale is consistent within this diagram; screen size is not a physical ruler.

Format: Zinc-air button cell
Dimensions: 7.9 × 3.6 mm
Voltage: 1.4 V nominal
Chemistry: Zinc-air
Drain context: Air-activated; performance depends on activation and use
Rechargeable?: No — primary cell; do not recharge.
Capacity context: Product- and test-specific; consult a current manufacturer datasheet.
Confidence: High

Equivalence and confusion matrix

Code or familyClassificationReason

PR41 · 312 · PR312 · AC312Exact equivalentThese evidence-backed markings resolve to this one canonical record and share its cited physical and electrical specification.

LR41 / AG3Same size, different electrical familyThe 7.9 × 3.6 mm envelope matches, but the electrical families do not: Zinc-air at 1.4 V nominal versus Alkaline manganese dioxide / zinc at 1.5 V nominal. Physical fit is not equivalence.

SR41SW / 384Same size, different electrical familyThe 7.9 × 3.6 mm envelope matches, but the electrical families do not: Zinc-air at 1.4 V nominal versus Silver oxide / zinc at 1.55 V nominal. Physical fit is not equivalence.

SR41W / 392Same size, different electrical familyThe 7.9 × 3.6 mm envelope matches, but the electrical families do not: Zinc-air at 1.4 V nominal versus Silver oxide / zinc at 1.55 V nominal. Physical fit is not equivalence.

SR731SW / 329Not equivalentThe physical envelopes differ (7.9 × 3.6 mm versus 7.9 × 3.1 mm). Do not force, stack or infer equivalence from a shared diameter or code pattern.

Supported application context

Hearing aids specifying this size

Application context is limited to the scope stated in Energizer size 312 Product Datasheet; it is not a device compatibility claim.

This is an air-activated hearing-aid size. Confirm the numeric or PR marking before removing the tab; tab colour alone is not a technical identifier.

PR41/size 312 shares 7.9 × 3.6 mm dimensions with LR41 alkaline and both SR41 silver-oxide drain classes. Its air-activated 1.4 V chemistry makes this a three-chemistry same-size example.

Commonly confused

LR41 / AG3 — compare all four decision fields.
SR41SW / 384 — compare all four decision fields.
SR41W / 392 — compare all four decision fields.
SR731SW / 329 — compare all four decision fields.

What the code means

PR41 is the IEC-style zinc-air identity; the numbered size and AC/PR forms are evidence-backed names for the same physical family.

Discharge and drain behaviour

Removing the tab admits air and starts activation. Delay after activation, airflow, temperature and use pattern can materially change service life.

Capacity context: Product- and test-specific; consult a current manufacturer datasheet.

Substitution guidance

Use the exact supported size specified by the hearing device. Colour tabs help identify a size but are not, by themselves, proof of equivalence.

Fact-level evidence

Energizer size 312 Product Datasheet

Published by Energizer; page 1, specifications and industry-standard dimensions drawing. Checked 2 September 2026. Independently presented facts only; publisher wording, layout and diagrams are not reproduced.

Corroborated against Energizer Battery Cross Reference Guide; page 3, size PR41 / size 312 row in the hearing-aid battery table.

Open primary source Open corroborating source

Not a device-fit guarantee.

Confirm the exact code, chemistry and drain requirement with the device maker. Keep button and coin cells away from children and never recharge this primary cell.