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In stock 120 in stock
6.95 1+ units
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5.56 100+ units

Description: This is a very small, extremely light weight battery based on the new Polymer Lithium Ion chemistry. This is the highest energy density currently in production. Each cells outputs a nominal 3.7V at 110mAh! Comes terminated with a standard 2-pin JST-PH connector - 2mm spacing between pins. These batteries require special charging. Do not attempt to charge these with anything but a specialized Lithium Polymer charger.

Battery includes built-in protection against over voltage, over current, and minimum voltage.

Note: Be careful with the JST connectors. They can stick in pretty good and tugging on them can damage the connector. Check this tutorial for an easy way to remove them safely.

Note: The dimensions in the datasheet are incorrect.

Dimensions: 5.7x12x28mm

Weight: 2.65g


  • 2C continuous discharge - very high for low price
  • Excellent long-term self-discharge rates (<8% per month)
  • Robust power source under extreme conditions (-25 to 60C)


Comments 50 comments

  • Can ‘we’ get a clear answer/link? What can be used to re-charge these Li-Po batteries??

    Specifically these 40mA Li-Po’s.. (and the 110mA ones too),… I read talk of chips…changing this or that..

    Is there a product sold that can re-charge these?
    If not…. should probably be noted..

    If the only way is to buy an existing product (ie: and then altering it somehow,..then that also should be noted, with a clear diagram/outline/tutorial on exactly needs to be done..

    Just a simple product that ‘works’… to re-charge these and the 100mA ones)


    • In the comments for this item:, MikeGrusin (from SparkFun) replied ( about how to modify the basic lipo charger to handle smaller batteries. Essentially, you take the 2k PROG resistor out, and replace it with a larger resistor. Per the datasheet, you should replace it with a 40k resistor to bring the charge down to 40mAh, which is appropriate for the smaller batteries.

      I used a 33k surface mount resistor that I had lying around. It was one size up from the old resistor, but it was fine. Alternately, you can use a through-hole resistor if you solder carefully. So far, my tiny 40mAh battery is charging fine, and is not at all warm. Obviously, YMMV.

    • The Revolectrix Cellpro chargers can be set as low as 10mA. The higher end Powerlab models allow configuration and monitoring through a PC. See

    • As these batteries are just simple LiPo batteries, any LiPo charger will do. Sparkfun sells many of these:

      They’ve been selling these for quite a while now.

      • This is INCORRECT. Too fast of a charge rate WILL make your batteries hot and probably fail, possibly catastrophically. LiPo batteries are NOT to be trifled with.

        • Good to have somebody touting safety. Even so, Mikkel J is actually correct. Each of the chargers he listed can be set to charge at the maximum rated current for these cells, which is 100 mA. The end user just needs to make sure it IS set to that current, and not higher.

  • When do you expect back in stock?

  • Do you know when this product will become available again?

  • The spec sheet says the max dimensions of the battery are 4x15x28, but the size listed on the sparkfun page says the device is 4.8x13x28. 4.8 > 4. Are these batteries really <= 4 mm?

    • Even worse man, I’ve got two of these and they measure 5.7×11.3×27, wtf…

      *Edit: alright, the product description got it right, but the cell datasheet is contradictory to it.

  • It’s interesting that they’re rated 110mAh in the picture.

  • im using a micro usb cable connected to my computer to charge it. how long does it take?

  • Can’t find the 3D CAD model at There should be a batteries folder to match the website, correct?

    “The repo is organized in the same way as the product catalog. If you don’t know where a model goes, look at where the product is on the site.”

    • That means we don’t have one in there yet. We’ve been slowly getting 3d models added as customers request them. I’ll put in a model request for you!

      • Thanks :) But when I click on the 3D square logo on this part (??) it says, “We liked this product so much we modeled it!” Is that a mistake?

        Building a Pong Sat with this battery

        • Ah, I see the confusion now. The structure is a bit messed up. The battery should live here:

  • could you drive an arduino pro mini with one of these, and roughly how long for?

  • IF I plug 3 of these in to form a series… resulting in approx. 12v, will the protection circuit see that they are over voltage and shut these cells down??

    • Nope. Each circuit measures across its own cell. The other cells basically don’t factor into it at all. This is actually at the heart of a load-balancing charger (which is what you’d need to charge the 3 cells if you keep them in series), where a connector wired across each individual cell allows the charger to get the voltage across each individual cell, and charge them individually as appropriate for the cell’s given voltage, bypassing any overall protection circuitry.

  • Availability? I would need few of these by the next weeks…

  • Question: If I’m charging this battery with the basic charger from sparkfun off my computer, how long does it take to finish charging?

  • What do you use to charge this battery? Since the 0.2CA charging rate is about 20ma, i can’t find any charger that will do less than 100ma.

    • Note that the max charging rate is 1C, so you can successfully (and quickly) charge these at 100mA.

      If you’d rather treat the cell more kindly and charge it at 0.2C, you could use one of our MCP73831T-based charger boards, but you would have to replace the PROG resistor with something in the 40K range to get a 20mA charge rate. See the datasheet and schematics for those chargers for details.

  • i would not recommend charging these in parallel or in series unless you have the correct balancing charger for them, they do have them listed here

  • Does the battery charge if we connect the battery to Lilypad Arduino Simple Board and we connect the Simple Board to the computer using USB?

  • Does this provide 3.3V of input to an Arduino Lilypad? Need to attach a sound sensor to that Arduino which requires 3.3V

  • Any idea when these will be back in stock?

  • Just a question, how can I charge these batteries if I have two of them connected in parallel together? Can I still use a standard lipo charger?

    Thanks for any suggestion. Paolo.

  • In order to use this battery properly do we need to monitor the voltage to prevent overdischarging?

  • not sure if this matters to anyone, but the last batch i got of these had different dimensions. same 110mah, but 5x11.5x28. previous was 4x17.5x29 (all in mm). so - a bit thicker, but much smaller footprint. don’t have an accurate enough scale to weigh them.

  • any updates on when these will be back in stock?

  • If I am using a voltage booster (PRT-08999) can I splice in a second wire set from the battery’s wires and run a display and arduino while charging?

  • Maybe a bit overkill for this use, but it can power a chinese bluetooth mouse for two full days of intensive use:
    review and upgrade of 6D rechargeable bluetooth mouse

  • When will you stock batteries like this? 130mah 25C, $7 qty 1

  • The tutorial button doesn’t work…

  • According to my scale, they weigh 2.79 grams each

  • I’m looking for a 3V protection circuit like the one that is installed on this battery. The cell I’m using is actually 240mAh, but I suspect that this circuit would work. Anyone know where to buy a similar small protection circuit?

  • Does the LiPoly Fast charger work on this?

  • Updated datasheet posted, with correct weight and capacity!

  • Because everyone was so concerned with the unit weight i weighed it with a small scale once i recieved the product.
    the battery including the wire and JST connector weigh 4.2g

  • If your scale doesn’t go low enough to weigh one, why not weigh 10, 20 or even 100 of them at once and divide the weight on the scale by how many you are weighing?

  • the Datasheet says the package weighs approximately 10g

  • I’m in need of about 10 of these in the next 2 weeks. Do you know what sort of lead time is expected on these?

  • JST connector link is broken.

  • These batteries are small, but not nearly as light as mentioned in the description. They are actually about 3g each.

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