Match My Battery

364 vs 377 Battery: Size Difference

364 and 377 have the same 6.8 mm diameter, 1.55 V silver-oxide chemistry and low-drain marking, but 364 is 2.15 mm high while 377 is 2.6 mm high. They are different sizes, not exact equivalents.

Verdict
Same diameter · different height
Confidence
98%
Reviewed
2026-09-08
Same diameter · different height

364 and 377 are different thicknesses

Both cells are about 6.8 mm in diameter, but their heights are 2.15 mm and 2.6 mm.

Use the specified height; do not rely on contact spring travel.

Specification364377
Dimensions6.8 × 2.15 mm6.8 × 2.6 mm
Nominal voltage1.55 V1.55 V
ChemistrySilver oxideSilver oxide
RechargeableNoNo
Typical useAnalog watches, calculators, low-drain instrumentsAnalog watches, calculators, low-drain instruments
View 364 profile View 377 profile

Exact aliases, physical fit and electrical compatibility

364 and 377 have the same 6.8 mm diameter, 1.55 V silver-oxide chemistry and low-drain marking, but 364 is 2.15 mm high while 377 is 2.6 mm high. They are different sizes, not exact equivalents.

What changes when the chemistry changes

The 0.45 mm height difference can change contact pressure and whether the holder closes correctly. Matching voltage and chemistry do not cancel the height mismatch, so the complete battery code remains the deciding specification.

Application boundary

Use the code named by the watch or device manual. Do not force the taller 377 into a holder specified for 364 or rely on spring travel to make up the difference.

Related decisions: Review the 364 profile Review the 377 profile Measure the removed cell

Why this verdict

  • Diameter matches.
  • Height and capacity envelope differ.

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.