Match My Battery

Household

AAA battery replacement and equivalents

AAA is a 1.5 V alkaline manganese dioxide cylindrical battery measuring 10.5 × 44.5 mm. Match the complete specification before treating another marking as a replacement.

Technical content reviewed 2026-08-25

LR0324AMN2400
Nominal voltage
1.5 V
Dimensions
10.5 × 44.5 mm
Chemistry
Alkaline manganese dioxide

AAA specifications

Canonical codeAAA
Formcylindrical
RechargeableNo
Drain markingNot specified

Typical applications

  • Household electronics
  • lights
  • remotes
  • portable devices

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

AAA is the canonical 1.5 V alkaline cylindrical profile measuring 10.5 × 44.5 mm. LR03, 24A and MN2400 are reviewed aliases. HR03 has the same listed envelope but is a 1.2 V NiMH rechargeable profile.

LR03, 24A and MN2400 resolve to AAA in the normalized dataset. The name “triple-A” identifies the household size family, while the chemistry and voltage fields still need to match the device.

MarkingCatalog profileVoltageChemistryDimensionsDecision
AAA / LR03 / 24A / MN2400AAA · Alkaline1.5 VAlkaline manganese dioxide10.5 × 44.5 mmExact alias / canonical profile
Resolves to AAA; verify polarity and the device marking.
  • Canonical code and reviewed aliases resolve to one profile.
HR03HR03 · NiMH1.2 VNickel-metal hydride10.5 × 44.5 mmSame size · different voltage
Use the exact voltage and battery system specified by the device manufacturer.
  • The physical envelope matches.
  • Nominal voltage differs: 1.5 V versus 1.2 V.
  • Chemistry also changes from Alkaline manganese dioxide to Nickel-metal hydride.

Conditional substitutes

HR03 is a same-size rechargeable comparison, not an exact AAA alias. A device designed for a 1.5 V primary cell must explicitly support the 1.2 V NiMH system and its charging arrangement before that substitution is considered.

Physical fit is not electrical compatibility

The 10.5 × 44.5 mm dimensions narrow the candidate list, but they do not answer whether the device accepts a lower nominal voltage or rechargeable cells. Never infer that from the shared AAA-sized case.

How to verify before replacing AAA

  1. Record the complete marking: AAA, LR03, 24A or MN2400.
  2. Check whether the device specifies primary alkaline or rechargeable NiMH cells.
  3. Match polarity and the complete compartment layout before fitting a candidate.

Continue with: See a rectangular household profile Compare rechargeable lookalikes Use the size finder

Same-size batteries to review carefully

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

HR03 NiMH 1.2 V 10.5 × 44.5 mm

Reviewed comparisons

AAA vs HR03Same size · different voltage

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.