Match My Battery

303 vs 357

A reviewed side-by-side decision based on form, fit, electrical specification and application limits.

Verdict
Same size · different drain
Confidence
91%
Reviewed
2026-08-09
Same size · different drain

303 and 357 share the main specification but use different drain markings

Dimensions, nominal voltage and chemistry align, but W/SW or other drain behavior differs.

Use the suffix requested by the device or an explicit multi-drain cross-reference.

Specification303357
Dimensions11.6 × 5.4 mm11.6 × 5.4 mm
Nominal voltage1.55 V1.55 V
ChemistrySilver oxideSilver oxide
RechargeableNoNo
Typical useAnalog watches, calculators, low-drain instrumentsDigital watches, medical instruments, devices with pulse loads
View 303 profile View 357 profile

Why this verdict

  • Physical size, chemistry and nominal voltage match.
  • Drain marking differs: low versus high.

What to verify in the device

Check the original compartment label, the current manual, polarity, terminal style and whether the device explicitly permits a chemistry or rechargeable alternative.

Sources for these profiles

  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.