Creative Commons images are CC BY-NC-SA 3.0

Description: Sure, your flashing, chip-tune playing t-shirt is really cool at the party… but at some point you need to turn it off. And yes, you could just pull the battery, or maybe you’ve even sewn a LilyPad slide switch in-line. Wouldn’t it be nice if there was just a switch on the battery? Well look no further.

This LilyPad Coin Cell Battery Holder has a small slide switch installed on the board, in-line with the power so you can shut off your project and save batteries. This slide switch is the same as is found on the LilyPad slide switch board, so it’s not easy to accidentally turn off or on.

Just like the original Coin Cell Battery Holder, this simple board holds a 20mm coin cell battery (such as a CR2032) and gives you 4 connection points (two positive and two negative) for sewing into your project.

Note: A portion of this sale is given back to Dr. Leah Buechley for continued development and education of e-textiles.


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Customer Comments

  • How many LED’s can you connect to this?

    • The more LED’s the less voltage to each and the dimmer they get. I think I read somewhere 3 or 4 works.

      • That’s only if they’re in series. If the LEDs are wired in parallel, like Christmas lights, then they share voltage, and the current is divided amonst them. Then, how long the battery lasts depends on how many LEDs are wired in parallel, so if you have 100 LEDs in parallel that draw 5mA each connected to a 1000mAH coin cell, you can run all the LEDs for 1000mAH/(5mA*100LEDs) = 2 hours, or mix and match.

  • So when using this with something like a white LED, the battery goes below the Vf of the LED very quickly. Is there a boost converter or something that will allow me to keep the voltage high enough to fully use the battery on LED’s like that?

    Perhaps we need a boost converter Lilly pad?

  • How good does this hold up during washes? We are looking to use this in a scarf that will be washed.

  • Can this power an Adafruit Flora or Gemma?

  • On mine the switch popped right off. Maybe some glue under the two plastic pins that go through the board would help.

  • Hi, I was wondering when this product might be back in stock please?

  • The combination of the battery holder and the switch was so practical, I had to get some right away. However, the solder joints that attach the battery holder were incredibly weak. Installing a battery caused the metal frame to pop off. Both of the boards that I bought had this problem. Re-soldering secures it nicely, but it’s a little awkward soldering on the shirt I had already sewn it into. I suggest reinforcing the solder joints that hold the battery frame before use. Oh, and don’t hold the frame with your finger while you are soldering it. :-)

    • Same thing happened to me. The casing just popped off and the joints don’t take rosen core solder very well, at least when I tried it.

      • Yep, I just designed a board that used that exact coin holder and we had the same problem of the holders popping off frequently. Learning from that, as we were hand soldering them, we just made sure that the solder mounded over coin cell holder tabs, and then we were good to go. It doesn’t look like (from the picture) that they’ve changed the manufacturing process to do that, so maybe you’ll want to go and throw more solder on there before sewing into the project. It’s not as pretty of a solder joint but hey… better than the holder popping off.

Customer Reviews

4 out of 5

Based on 2 ratings:

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Good for my wearable electronic bracelet

I was able to sew the holder right into a bracelet using steel thread, as it is lightweight and provides four holes for connecting. The connections worked well. The on/off switch should make it versatile for a number of applications. It fits a CR2025 coin cell battery.

Does the job, weak battery holder

This does the job of adding a battery to the project fine. The on off switch is nice. I got two of these this month (march 2015) and one had the battery holder pop off on first use. Had to put on my reflow skillet and add more solder. Holding fine so far.

Way to fix the board! Nice work. So sorry that it popped off in the first place. If you ever have troubles, please feel free to contact our Support staff and we’ll do our best to help resolve the issue. Cheers