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Home › Batteries › 18650
Rechargeable flashlight battery

18650 battery

1What it is2Safety3Other names4Facts5Buy it
  1. 1

    What it is

    18650

    18650 is a rechargeable flashlight battery, a bit bigger than an AA. It gives 3.6 volts.

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  2. 2

    Safety first

    This one is rechargeable

    It gives more power than a normal battery. Only use it in things made for it.

  3. 3

    Names you might see in the store

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

    INR18650ICR18650
  4. 4

    Quick facts

    Size
    A bit bigger than an AA
    Power
    3.6 volts
    Keeps in a drawer for
    About 3 years
    Rechargeable?
    Yes
    Found in things like
    FlashlightsPower banksE-bike packs
  5. 5

    Where to buy it

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

    Our pickThe exact match, 4-packEnergizer 18650 3.6V Battery (4-Pack)
    Check Price on Amazon →
    Best value10-pack, handy to keep in a drawer18650 3.6V Battery Value Pack (10-Pack)
    Check Price on Amazon →
    Other brandDuracell, the same batteryDuracell 18650 / 18650 3.6V Battery
    Check Price on Amazon →

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

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See it at real size

18650 next to a US quarter and an AA battery. “Real size” matches your hand once your screen is set up in Measure it.

18650US quarterAA

What do the letters mean?

Battery names are a code. Here’s how to read 18650:

1818 mm diameter
65065.0 mm length
Li-ion3.6V rechargeable

The same battery from each brand

BrandTheir name for it
Official name18650

Exact measurements

Width
18.0 mm (0.709 in)
Length
65.0 mm
Voltage
3.6V (empty at 2.5V)
Energy stored
3000 mAh
Weight
46 g
Made with
Lithium-ion rechargeable
Works between
-20 … 60 °C
Official code
18650

Questions people ask

Is 18650 the same as INR18650?

Yes. They’re the same battery with different names. You might also see INR18650, ICR18650.

How long will a spare keep in a drawer?

About 3 years if it stays cool and dry.

Can I recharge it?

Yes, it’s rechargeable. Only charge it in a charger or device made for it.

18650
18650Rechargeable flashlight battery
Get 18650 on AmazonAs an Amazon Associate, KnowYourBatteries.com earns from qualifying purchases.

Something wrong or missing? Tell us

1What it is2Safety3Other names4Facts5Buy it