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Alkaline button

LR1120 battery replacement and equivalents

LR1120 is a 1.5 V alkaline manganese dioxide button battery measuring 11.6 × 2.1 mm. Match the complete specification before treating another marking as a replacement.

Technical content reviewed 2026-08-09

AG8
Nominal voltage
1.5 V
Dimensions
11.6 × 2.1 mm
Chemistry
Alkaline manganese dioxide

LR1120 specifications

Canonical codeLR1120
Formbutton
RechargeableNo
Drain markingNot specified

Typical applications

  • Toys
  • calculators
  • small lights
  • simple electronics

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.

Equivalence and fit table

These rows use the catalog’s source-backed profile data and compatibility rules. An exact alias resolves to the same profile; every other row is a comparison to review, not an automatic substitute.

MarkingCatalog profileVoltageChemistryDimensionsFit decision
LR1120 / AG8LR1120 · Alkaline1.5 VAlkaline manganese dioxide11.6 × 2.1 mmExact catalog match
Resolves to LR1120; confirm polarity and the device marking.
381381 · Silver oxide1.55 VSilver oxide11.6 × 2.1 mmSame fit · different chemistry
Use only when the device maker explicitly approves both chemistry systems.
391391 · Silver oxide1.55 VSilver oxide11.6 × 2.1 mmSame fit · different chemistry
Use only when the device maker explicitly approves both chemistry systems.
LR1130LR1130 · Alkaline1.5 VAlkaline manganese dioxide11.6 × 3.1 mmSame diameter · different height
Use the specified height; do not rely on contact spring travel.

Fit guidance for LR1120

The catalog resolves LR1120 and AG8 to the LR1120 profile. Reviewed comparison rows are 381: same fit · different chemistry, 391: same fit · different chemistry, LR1130: same diameter · different height. Use the Fit decision column and the device manual before selecting a non-exact row.

Verify before replacing LR1120

  1. Read the complete marking and check whether it resolves to LR1120 or to another profile.
  2. Compare the 1.5 V, Alkaline manganese dioxide, and 11.6 × 2.1 mm values shown above with the device manual.
  3. For a non-exact row, follow its generated fit decision and confirm polarity, terminals, drain behavior, or charging requirements before installation.

Related reading: Silver oxide vs alkaline button cells · How to measure a battery safely · Battery code systems explained

Same-size batteries to review carefully

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

391 Silver oxide 1.55 V 11.6 × 2.1 mm 381 Silver oxide 1.55 V 11.6 × 2.1 mm

Reviewed comparisons

LR1120 vs 391Same fit · different chemistryLR1120 vs 381Same fit · different chemistryLR1120 vs LR1130Same diameter · different heightLR1120 vs LR1154Same 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.