KnowYourBatteries
KnowYourBatteries
Find by thingFind by batteryCan I swap?Measure itGuidesAbout usContact usSwallowed a battery?
Privacy policyTerms of useAffiliate disclosureCookie settings
EnglishEspañolFrançaisDeutsch

As an Amazon Associate, KnowYourBatteries.com earns from qualifying purchases. Battery facts come from the makers’ datasheets.

HomeFind by thingFind by batteryCan I swap?Measure it
Home › Can I swap? › AAA vs R03
Can I swap?

AAA vs R03: can you swap them?

1The short answer2Both ways3Differences4Buy it5Learn more
  1. 1

    The short answer

    UsuallyUsually, but check your deviceSame size and power, made a little differently. Fine for most everyday things.
    AAA
    AAAShorter and thinner than an AA
    R03
    R03A bit shorter than an AA and as thin as a pencil
    Search Amazon for AAAAs an Amazon Associate, KnowYourBatteries.com earns from qualifying purchases.

    Something wrong or missing? Tell us

  2. 2

    Both ways round

    Can I put R03 where AAA goes?Usually
    Can I put AAA where R03 goes?Usually
  3. 3

    What’s different

    AAAR03
    SizeShorter and thinner than an AAA bit shorter than an AA and as thin as a pencil Same
    LengthShorter and thinner than an AAA bit shorter than an AA and as thin as a pencil Same
    Power1.5 volts1.5 volts Same
    KindEveryday AAA batteryRegular battery

    Lasts longer: AAA (about 122% longer)

  4. 4

    Where to buy AAA

    As an Amazon Associate, KnowYourBatteries.com earns from qualifying purchases.

    Amazon searchEnergizer listings, any pack sizeSearch Amazon for Energizer E92
    See results on Amazon →
    Amazon searchMulti-packs from any brandSearch Amazon for AAA multi-packs
    See results on Amazon →
    Amazon searchDuracell MN2400 listings, the same batterySearch Amazon for Duracell MN2400
    See results on Amazon →

    Buttons open amazon.com 🇺🇸, picked from your country.

    Search Amazon for R03As an Amazon Associate, KnowYourBatteries.com earns from qualifying purchases.
  5. 5

    Learn more

    About AAAAbout R03Check another pair
Show more details (optional)

Questions people ask

Can I use R03 instead of AAA?

Usually. Same size and power, made a little differently. Fine for most everyday things.

Can I use AAA instead of R03?

Usually. Same size and power, made a little differently. Fine for most everyday things.

Which one lasts longer?

AAA (about 122% longer).

All the numbers

AAAR03
Diameter10.5 mm10.5 mm
Height44.5 mm44.5 mm
Nominal voltage1.5V1.5V
Typical capacity1200 mAh540 mAh
ChemistryAlkalineCarbon-zinc
Shelf life10 yrs5 yrs
Operating temp-18 to 55 °C-10 to 60 °C
Can I use R03 instead of AAA?Usually
Search Amazon for AAAAs an Amazon Associate, KnowYourBatteries.com earns from qualifying purchases.

Something wrong or missing? Tell us

1The short answer2Both ways3Differences4Buy it5Learn more