Retired Product

This product has been retired from our catalog and is no longer for sale. This page is made available for those looking for datasheets and the simply curious.

Creative Commons images are CC BY 2.0

Description: A small, but mighty power supply. This board was designed to be as small and inconspicuous as possible. Pop in a AAA battery, flip the power switch, and you will have a 5V supply to power your LilyPad circuit. Good up to 200mA. Short circuit protected.

This board has AAA battery clips but can use an input from 1.2V to 5V. Our lithium polymer batteries are a good, rechargeable alternative.

LilyPad is a wearable e-textile technology developed by Leah Buechley and cooperatively designed by Leah and SparkFun. Each LilyPad was creatively designed to have large connecting pads to allow them to be sewn into clothing. Various input, output, power, and sensor boards are available. They’re even washable - but be sure to remove the battery!

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


  • 56x26mm
  • Thin 0.8mm PCB


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Customer Comments

  • Can this power a Lilypad Arduino USB? The Lilypad Arduino USB requires between 2.7 and 5.5 volts. If I insert a AAA battery, that’s 1.5V. The description says: “Pop in a AAA battery, flip the power switch, and you will have a 5V supply to power your LilyPad circuit”. Does this mean it will scale up my 1.5V to 5V? and thus I’ll be able to power my Lilypad Arduino USB. Or does the sentence mean I can insert in the clip any battery between 1.5 and 5V? And then if I put 1.5V, I get 1.5V, which is not enough for the LilyPad Arduino USB.

  • I’d really like to know what the weight is (and whether that weight includes the AAA cell).

    My “flashy Santa Hat” is having a problem that the 3xAAA batteries (in an Adafruit 727 battery holder) is just too heavy. I’m going to change the battery arrangement somehow before next year, but one issue is that it needs (about) 5V, so a LiPo (or a coin cell) would need a boost as well. I measured the average current and it’s roughly 4 mA (using a Fluke 77).

  • Does this power supply also charge the battery if the battery is rechargeable? Or would you have to connect a Lipo charger for this to recharge a battery? And if it doesn’t recharge it, does it have a terminal to connect a charger? Or is this just a basic power supply for the board, with no charging capabilities at all? I know the Lilypad Lipower says you can connect a Lipo charger to it so you can recharge the batteries, too, but I’m kind of confused about this one because it says a lithium polymer battery is a good rechargeable alternative to AAA battery, but doesn’t say if the battery has to be charged separately.

  • Can you connect multiple things to the one power hole?

  • I’m new to electronics, so I don’t really get the power supply output. How do you get 5v from a AAA battery?

    • It uses a boost converter setup. Specifically, it uses the NCP1402 that will boost up from as low as 0.8V (even lower, but it requires 0.8V start-up) to 5V with just a few extra components (most importantly, the inductor). It does so at a detriment to battery life (the boost circuit will draw more current from the battery than the device you’re powering needs), and a bit of lowered efficiency than if you were to use a 5V battery to begin with.

  • Is there an alternative to this with a higher current rating? I want to power 5V heating pads which seem to draw 700mA each.

  • Do you sell just the AAA clips? I’ve bought your AA clips, but really need the smaller AAA ones

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