AA vs HR6

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

AA and HR6 fit the same case but are not electrically interchangeable

AA is rated at 1.5 V and HR6 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.

SpecificationAAHR6
Dimensions14.5 × 50.5 mm14.5 × 50.5 mm
Nominal voltage1.5 V1.2 V
ChemistryAlkaline manganese dioxideNickel-metal hydride
RechargeableNoYes
Typical useHousehold electronics, lights, remotesRechargeable household devices, cameras, controllers

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.

  5. Energizer — AA alkaline engineering datasheet

    Representative cylindrical alkaline designation, voltage, dimensions and performance context.