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 › Batteries › LR61
Extra-thin AAAA battery

LR61 is the same as AAAA

1What it is2Other names3Facts4Buy it
  1. 1

    What it is

    AAAA

    LR61 is just another name for AAAA. Same battery, different label, so you can buy either one.

    Get AAAA on AmazonAs an Amazon Associate, KnowYourBatteries.com earns from qualifying purchases.

    Something wrong or missing? Tell us

  2. 2

    Names you might see in the store

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

    AAAAE96MN250025A
  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 7 years
    Rechargeable?
    No, use once
    Found in things like
    Stylus pens (Surface Pen)LED penlightsGlucose meters
  4. 4

    Where to buy it

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

    Our pickThe exact match, 4-packEnergizer LR61 (AAAA) 1.5V Battery (4-Pack)
    Check Price on Amazon →
    Best value10-pack, handy to keep in a drawerLR61 (AAAA) 1.5V Battery Value Pack (10-Pack)
    Check Price on Amazon →
    Other brandDuracell MN2500, the same batteryDuracell MN2500 / AAAA 1.5V Battery
    Check Price on Amazon →

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

Show more details (optional)

See it at real size

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

AAAAUS quarterAA

What do the letters mean?

Battery names are a code. Here’s how to read LR61:

LAlkaline chemistry (1.5V)
RRound button form factor
61Legacy IEC size number, not a dimension. Actual size 8.3 × 42.5 mm

The same battery from each brand

BrandTheir name for it
Official nameLR61
Shop nameAAAA
EnergizerE96
DuracellMN2500

Exact measurements

Width
8.3 mm (0.327 in)
Length
42.5 mm
Voltage
1.5V (empty at 0.9V)
Energy stored
625 mAh
Weight
6.5 g
Made with
Alkaline
Works between
-18 … 55 °C
Official code
LR61

Questions people ask

Is LR61 the same as AAAA?

Yes. They’re the same battery with different names. You might also see AAAA, E96, MN2500, 25A.

How long will a spare keep in a drawer?

About 7 years if it stays cool and dry.

Can I recharge it?

No. Never try to recharge it.

AAAA
AAAAExtra-thin AAAA battery
Get AAAA on AmazonAs an Amazon Associate, KnowYourBatteries.com earns from qualifying purchases.

Something wrong or missing? Tell us

1What it is2Other names3Facts4Buy it