Match My Battery

AAA vs HR03

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

Verdict
Same size · different voltage
Confidence
100%
Reviewed
2026-08-09
Same size · different voltage

AAA and HR03 fit the same case but are not electrically interchangeable

AAA is rated at 1.5 V and HR03 at 1.2 V. Matching dimensions do not make cells with materially different nominal voltages safe replacements.

Use the exact voltage and battery system specified by the device manufacturer.

SpecificationAAAHR03
Dimensions10.5 × 44.5 mm10.5 × 44.5 mm
Nominal voltage1.5 V1.2 V
ChemistryAlkaline manganese dioxideNickel-metal hydride
RechargeableNoYes
Typical useHousehold electronics, lights, remotesRechargeable household devices, cameras, controllers
View AAA profile View HR03 profile

Why this verdict

  • 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.

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.