9V to Barrel Jack Adapter

This simple cable has so many uses! Plug the 9 volt battery clip onto a standard 9V battery and connect the other end to anything with a 5.5x2.1mm, center-positive barrel jack.

Use this cable to battery-power any device that needs 9V and has an on-board barrel jack - it works great for Arduinos, development boards, evaluation boards, and more!

9V to Barrel Jack Adapter Product Help and Resources

Prototype Wearable LED Dance Harness

February 8, 2018

A project tutorial to add an extra effect for dancers performing a choreographed piece. The harness can be added quickly under a costume.

Wireless Gesture Controlled Robot

April 25, 2019

Control the RedBot wirelessly based on the movement of your hand using an accelerometer, Arduino, and XBees!

Interactive 3D Printed LED Diamond Prop

April 19, 2018

In this tutorial, we will learn about how to create an interactive theatrical prop for a performance by 3D printing a translucent diamond prop using a non-addressable RGB LED strip and AT42QT1011 capacitive touch sensing.

Motion Controlled Wearable LED Dance Harness

January 30, 2019

Control LEDs based on your movement using an accelerometer! Make your LEDs breathe by fading in and out when laying on the floor, turn off the LEDs when moving to your side, or make the LEDs blink in a headstand!


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.

  • bobdabiulder / about 8 years ago / 1

    What is the inside of the cable like? Is it two separate insulated wires? I might use it for a desktop power supply idea.

  • Sciguy / about 15 years ago / 2

    This should probably be listed under batteries in the prototyping section.
    Also, any idea when these will com in stock?

  • Member #560356 / about 10 years ago / 1

    Any idea if this would work with littleBits kits? It runs on a 9v battery and jack, just not sure what the official size of the jack is. Also their pieces are way expensive.

  • anseljh / about 11 years ago / 1

    Are there any reasons not to use this with non-9V battery holders with 9V-style snap terminals?

    • Kamiquasi / about 11 years ago / 1

      None that I can think of, it's just wires (of course you don't want to overheat the wires, but anything that uses 9V style terminals probably wouldn't run afoul of this).

  • Member #131390 / about 12 years ago / 1

    any idea on the ETA for this product?

  • mceranski / about 12 years ago / 1

    My adapter was faulty. I had to cut apart the housing on the barrel jack and re-solder the ground wire. I think this product should no discontinued because its obviously not being manufactured correctly.

    It would be nice if a 9V battery housing with a on/off switch was available through SparkFun (hint, hint)...

  • The battery connectors do not have the strongest attachment point to the wire, but if you are careful, they are pretty durable adapters. We've had one bouncing around Tech Support for the last several months that also survived being used in our AVC car ;-). Unfortunately, we do not design or build these in-house so no change on this in the foreseeable future. However, if you ever receive a defective one, please let us know and we can get you set up with an exchange.

  • qzjake / about 13 years ago / 1

    I had to perform surgery, cutting open the connector and re-solder the leads. I suggest changing the design to use a hard plastic connector.
    These poor little connectors were the death of several childhood toys.

  • SomeGuy123 / about 13 years ago * / 1

    Mine didn't work. I thought the problem was with the flimsy battery connector, but after some wire-clipping, I determined that the barrel part was faulty. I opened it up and found a loose wire.

  • TPalm / about 14 years ago / 1

    any ideas when these will be back in stock?

Customer Reviews

5 out of 5

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Great quality

No complaints.

Handy little adapter

Great little adapter. I use them to supply power to breadboard power supplies (https://www.sparkfun.com/products/114) from anything with a 9V battery style clip. A couple of 4-D cell battery holders wired together plus one of these adapters gives me plenty of portable 12V power for my breadboard projects and any other devices I have that require 9-12 V.