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Coin Cell Battery - 20mm (CR2032)

CR2032 Lithium metal 3V 250mAh button cell battery. Great for powering low power processors or blink an LED for weeks at a time.

Note: This battery is not available to ship to Alaska or Hawaii, or through any express services (2-day, overnight), or internationally. This is temporary! Check out our blog post for more information. Additionally orders may take longer to process and therefore do not qualify for same-day shipping. Sorry for any inconvenience this may cause!

Note: This item is non-returnable. If this item arrives damaged or is not functioning properly, please do not hesitate to contact us to see if further actions may be taken.

  • 20x3.2mm

Coin Cell Battery - 20mm (CR2032) Product Help and Resources

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Flashlight Kit

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This is an assembly guide for the SparkFun Flashlight Kit, a basic learn to solder kit.

Battery Technologies

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The basics behind the batteries used in portable electronic devices: LiPo, NiMH, coin cells, and alkaline.

Adjustable LiPo Charger Hookup Guide

September 28, 2017

The SparkFun Adjustable LiPo Charger is a single-cell lithium polymer (LiPo) and lithium ion battery charger. Because it’s adjustable, this charger will be able to safely charge all of our singe-cell batteries.

3D Printed Illuminated Wand Prop

November 29, 2018

In this tutorial, we will learn about how to create a theatrical prop for a performance by 3D printing a wand and adding an LED.

Core Skill: Electrical Prototyping

If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.

1 Electrical Prototyping

Skill Level: Noob - You don't need to reference a datasheet, but you will need to know basic power requirements.
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Looking for answers to technical questions?

We welcome your comments and suggestions below. However, if you are looking for solutions to technical questions please see our Technical Assistance page.

  • How much do these batteries weigh ? Weight is critical !

    Also any advice you can give on adding Voltage ( 6v ) ? Do you have any products that do this ? Once again, weight is critical.

    Thanks in advance !

    • Typical Weight: 3.0 grams (0.10 oz.) If you need 6V, just stack two of them.

  • Hello. Can these batteries power a ESP8266 module? Cheers

  • It's NOT LI-ION. It's Li-Mn !!!

  • The USPS considers these to be hazardous materials, digikey only allows shipping via UPS/Fedex. Are you able to get around this somehow?

    • Unfortunately, we are also not allowed to ship batteries using USPS. We do still ship via UPS and FedEx however.

      • actually that's not true you can ship batteries via usps as long as the combined Mah capacity doesnt go over 3000mah and you dont require air shipping (i.e. non international mail only)

        • Here are the actual regulations:

          622.51 Primary Lithium (Non-Rechargeable) Cells and Batteries Small consumer-type primary lithium cells or batteries (lithium metal or lithium alloy) like those used to power cameras and flashlights are mailable in a single shipment with the following restrictions: The batteries must be installed in the equipment being shipped. Each shipment may contain a maximum of four lithium cells or two lithium batteries. The lithium content must not exceed 1 gram (g) per cell. The total aggregate lithium content must not exceed 2 g per battery. The batteries installed in the equipment must be protected from damage and short circuit. The equipment must be equipped with an effective means of preventing it from being turned on or activated. The equipment must be contained in a strong sealed package and cushioned to prevent movement or damage.

  • Is this really li-ion? If so, is it secondary? I don't know of any 3V li-ion cells (As opposed to lithium metal)

  • I wish you would stop using quarters for size reference in your photos. Not everyone outside the US knows how large a quarter is. What's wrong with rulers?

  • Don't know if I just got a bad batch. 4 out of the 6 that I ordered were already half discharged the first time I used them.

    • Email techsupport@sparkfun. They should be able to help you out with replacements. Sorry about that!

  • is there a datasheet available? do they have a peak current we should stay under? 50mA? any rule-of-thumb we might be able to use if one is not available?

  • How would I use more than one of these in a circuit? Can I stack them?

  • How long could this run the pro mini 3.3V without anything attached or sending it in to any sleep modes?

    • I'd guess 15-25 hours. Be sure to bypass the 3.3V regulator on the Mini, and run it directly off the 3V battery (the ATmega 328 will run down to 1.8V).

  • Anyone can provide the protection circuit for charging and discharging this Li-ion?

  • Is this rechargable?

  • How much does it weigh?

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