Match My Battery

Silver oxide

329 battery replacement and equivalents

329 is a 1.55 V silver oxide button battery measuring 7.9 × 3.1 mm. Match the complete specification before treating another marking as a replacement.

SR731SWD329
Nominal voltage
1.55 V
Dimensions
7.9 × 3.1 mm
Chemistry
Silver oxide

329 specifications

Canonical code329
Formbutton
RechargeableNo
Drain markinglow

Typical applications

  • Analog watches
  • calculators
  • low-drain instruments

Replacement decision

Resolve the original marking to this profile, then confirm nominal voltage, chemistry, dimensions, polarity and any drain or terminal suffix. Capacity alone does not establish interchangeability.

Reviewed comparisons

329 vs 396Same diameter · different height329 vs 392Same diameter · different height329 vs 384Same diameter · different height329 vs 397Same diameter · different height329 vs 362Same diameter · different height329 vs 361Same diameter · different height329 vs 315Same diameter · different height329 vs 341Same diameter · different height

Technical sources

  1. International Electrotechnical Commission — IEC 60086-1:2026 — Primary batteries, general requirements

    Primary-battery nomenclature, form, fit, function, terminal and electrochemical-system framework.

  2. Energizer — Battery Replacement Guide

    Cross-reference codes and manufacturer guidance to replace the same size and type together.

  3. Duracell — Battery Cross Reference Chart

    Independent manufacturer cross-reference families and corresponding product numbers.

  4. Duracell — Battery chemistry technical bulletins

    Alkaline, lithium-manganese-dioxide, zinc-air and silver-oxide chemistry behavior.