Match My Battery

Silver oxide

395 Battery Equivalent: SR927SW & Options

SR927SW is the exact silver-oxide profile for battery 395. Same-size 399 and LR927 cells require separate drain and chemistry checks.

Technical content reviewed 2026-09-08

SR927SWD395
Nominal voltage
1.55 V
Dimensions
9.5 × 2.7 mm
Chemistry
Silver oxide

395 specifications

Canonical code395
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.

Exact equivalents and aliases

395 is the canonical 1.55 V silver-oxide profile with the 9.5 × 2.7 mm SR927SW dimensions. 399 shares those dimensions with a different W drain marking; LR927 is a 1.5 V alkaline same-size profile.

The numeric 395 code resolves to the SR927SW profile in this catalog. It has no exact LR927 alias here: LR927 is a separate alkaline row even though both codes describe the same listed envelope.

MarkingCatalog profileVoltageChemistryDimensionsDecision
395 / SR927SW / D395395 · Silver oxide1.55 VSilver oxide9.5 × 2.7 mmExact alias / canonical profile
Resolves to 395; verify polarity and the device marking.
  • Canonical code and reviewed aliases resolve to one profile.
399399 · Silver oxide1.55 VSilver oxide9.5 × 2.7 mmSame size · different drain
Use the suffix requested by the device or an explicit multi-drain cross-reference.
  • Physical size, chemistry and nominal voltage match.
  • Drain marking differs: low versus high.
LR927LR927 · Alkaline1.5 VAlkaline manganese dioxide9.5 × 2.7 mmSame fit · different chemistry
Use only when the device maker explicitly approves both chemistry systems.
  • The physical envelope matches.
  • Nominal voltage is close.
  • Chemistry and discharge behavior differ.

Conditional substitutes

399 is the high-drain SR927W counterpart. The comparison engine classifies it as conditional because the size, chemistry and voltage align while the drain marking differs. LR927 changes chemistry and voltage, so it is not an automatic 395 replacement.

Physical fit is not electrical compatibility

A 9.5 × 2.7 mm candidate may seat in the watch, but a watch’s drain demand can make the W/SW distinction matter. Physical fit is the first check, not the final compatibility decision.

How to verify before replacing 395

  1. Confirm whether the original marking is 395, 399 or LR927.
  2. Keep the W/SW drain suffix visible when checking a watch-cell cross-reference.
  3. Use the device maker’s requirement when a same-size alkaline cell is being considered.

Continue with: Compare the nearby LR920 family Review W versus SW Review chemistry differences

Same-size batteries to review carefully

These profiles share the nominal physical envelope. They are not automatically equivalent.

LR927 Alkaline 1.5 V 9.5 × 2.7 mm 399 Silver oxide 1.55 V 9.5 × 2.7 mm CR927 Lithium 3 V 9.5 × 2.7 mm

Reviewed comparisons

395 vs 399Same size · different drain395 vs LR927Same fit · different chemistry395 vs CR927Same size · different voltage395 vs 371Same diameter · different height395 vs 370Same diameter · different height395 vs 394Same diameter · different height395 vs 373Same 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.