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Home › Batteries › A21
6-volt specialty battery

A21 battery

1What it is2Other names3Facts4Buy it
  1. 1

    What it is

    A21

    A21 is a 6-volt specialty battery, short and skinny, about 1.6 cm long. It gives 6 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.

    4LR93211AE11AMN11V11GAL10164LR23LR1016
  3. 3

    Quick facts

    Size
    Short and skinny, about 1.6 cm long
    Power
    6 volts
    Keeps in a drawer for
    About 5 years
    Rechargeable?
    No, use once
    Found in things like
    Garage door remotesCar alarmsWireless doorbells
  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 E11A
    See results on Amazon →
    Amazon searchMulti-packs from any brandSearch Amazon for A21 multi-packs
    See results on Amazon →
    Amazon searchDuracell MN11 listings, the same batterySearch Amazon for Duracell MN11
    See results on Amazon →

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See it at real size

A21 next to a US quarter and an AA battery. “Real size” matches your hand once your screen is set up in Measure it.

A21US quarterAA

What do the letters mean?

Battery names are a code. Here’s how to read A21:

A21Common retail name for this cell
A21Physical cell: 10.3 × 16.0 mm, 6.0V alkaline high-v

The same battery from each brand

BrandTheir name for it
Official name4LR932
Shop nameA21
EnergizerE11A
DuracellMN11
VartaV11GA

Exact measurements

Width
10.3 mm (0.406 in)
Length
16.0 mm
Voltage
6.0V (empty at 3.6V)
Energy stored
55 mAh
Weight
—
Made with
Alkaline (stacked cells)
Works between
-10 … 50 °C
Official code
4LR932

Questions people ask

Is A21 the same as 4LR932?

Yes. They’re the same battery with different names. You might also see 4LR932, 11A, E11A, MN11.

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.

A21
A216-volt specialty battery
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1What it is2Other names3Facts4Buy it