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Home › Batteries › R03
Regular battery

R03 battery

1What it is2Other names3Facts4Buy it
  1. 1

    What it is

    R03

    R03 is a regular battery, a bit shorter than an AA and as thin as a pencil. It gives 1.5 volts.

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  2. 2

    Names you might see in the store

    All of these are the same battery. Any of them will work.

    24D24F91224G1212
  3. 3

    Quick facts

    Size
    A bit shorter than an AA and as thin as a pencil
    Power
    1.5 volts
    Keeps in a drawer for
    About 5 years
    Rechargeable?
    No, use once
    Found in things like
    Toys & calculatorsRemote controlsSmall remotes
  4. 4

    Where to buy it

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

    Amazon searchEnergizer listings, any pack sizeSearch Amazon for Energizer 1212
    See results on Amazon →
    Amazon searchMulti-packs from any brandSearch Amazon for R03 multi-packs
    See results on Amazon →
    Amazon searchDuracell listings, the same batterySearch Amazon for Duracell R03
    See results on Amazon →

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See it at real size

R03 next to a US quarter and an AA battery. “Real size” matches your hand once your screen is set up in Measure it.

R03US quarterAA

What do the letters mean?

Battery names are a code. Here’s how to read R03:

RRound cylindrical form factor
3Carbon-zinc size number, not a dimension. Actual size 10.5 × 44.5 mm

The same battery from each brand

BrandTheir name for it
Official nameR03
Energizer1212

Exact measurements

Width
10.5 mm (0.413 in)
Length
44.5 mm
Voltage
1.5V (empty at 0.9V)
Energy stored
540 mAh
Weight
—
Made with
Carbon-zinc
Works between
-10 … 60 °C
Official code
R03 · ANSI 24D

Questions people ask

Is R03 the same as 24D?

Yes. They’re the same battery with different names. You might also see 24D, 24F, 912, 24G.

How long will a spare keep in a drawer?

About 5 years if it stays cool and dry.

Can I recharge it?

No. Never try to recharge it.

R03
R03Regular battery
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1What it is2Other names3Facts4Buy it