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We have a purchase for 2500 units. We expect some of these to arrive next on Apr 4, 2015.

Incoming stock values are estimates, and subject to change without warning.

limit of 2 per customer

Description: These are very slim, extremely light weight batteries based on the new Polymer Lithium Ion chemistry. This is the highest energy density currently in production. Each cell outputs a nominal 3.7V at 1000mAh! 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. Please use caution when using this battery in wearable projects. When using conductive thread, a short in the thread can create sparks and heat. We recommend using coin cell batteries for beginners.

Note: Due to the requirements of shipping these batteries, only two batteries can be shipped together at one time and orders may take longer to process and therefore do not qualify for same-day shipping. Sorry for any inconvenience this may cause.

Note: Although these cells are rated for 2C continuous discharge, the wiring and connectors are only rated up to 1A, so be sure to take that into account when determining your power requirements.

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.

Dimensions: 2.00 x 1.32 x 0.23" (50.8 x 33.5 x 5.9 mm)

Weight: 22g (0.77oz)


  • Excellent long-term self-discharge rates (<8% per month)
  • Robust power source under extreme conditions (-25 to 60C)


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Customer Comments

  • Great for replacing dead PS3 controller batteries. Just reverse the polarity on the jst plug. Its a bit thicker than the original ps3 battery though, but it still goes back together nicely.

  • i need 11.1- 13 volts for powering a model train. would i be able to pair 2 of these batteries together somehow??

  • FYI these do fit inside iPod classic 3g’s if you replace the hard drive with an SD card. The runtime becomes something like 10-11 hours, really nice.

  • Whats the best way mount these in an enclosure? Double Sided Tape? Is there holder of some sort available?

  • Any reason why these are limited to 2 per customer?

    • It’s a shipping regulations thing. E.g. UPS: . Per their flowchart, if you got 3 of these together, that’s 3Wh, and more than 2 batteries, thus requiring ‘a UPS Dangerous Goods contract’.

      Other shippers are subject to the same regulations.

      Edit: Oh, and if your question was more fundamental: It’s because people freak out about the energy density of these things together stuck in a truck/train/plane on the off chance that things go fizz, pop, boom.

  • For connecting these to a solderless breadboard, Adafruit has recently (Apr. 2014) come out with #1862 and #1863 “JST breakout boards”. (They also have a 3xAAA battery holder, #727, and a 2x coin battery holder, #783, that have JST connectors on them).

    FWIW, my only connection with either SparkFun or Adafruit is as a customer. I was the one who suggested the two breakout boards on the Adafruit Forums, so am pleased that they took my suggestion!

  • I used this battery to replace the weak battery on my FiiO E17 amplifier. Soldered the leads the board and the battery last longer than the alleged 1500mAh battery that the E17 came with. Awesome battery!

  • Greetings,

    Can anyone say me if is there a Li Charger for this battery?

    Thanks in advance

  • JS The Polymer Lithium Ion Battery - 1000mAh PRT-00339 in PocketBook 301+ works!

  • Does anyone know a good/tight enclosure that fits this well? I’ve been using little plastic hammond enclosures but this is too big for one size and too small for another size.

    This is pretty perfect, but they don’t sell it on it’s own.

  • Hey guys! I want to use this along with the LiPo charger/booster in my RGB LED mixer project. Would 1000mAh be sufficient for a decent runtime? Also could I have the board running from the USB charging connection while it’s charging the battery? Thanks!

  • any idea when you guys will get more?

  • What should I use to power a lilypad that is attached to find tiny patches of conductive fabric?

  • Instead of using this, for prototyping purposes the Nokia BL-5C Li-Ion(3.7 @ ~1000mAh) works great with the Sparkfun lipo basic charger…
    Not that there is anything bad about this product, but i am sure that like me, a bunch of you have plenty old nokia phones laying around. (im sure other phone brands work too)
    Just saying, its not a bad idea to repurpose those batteries instead of letting them leak in a dump. They dont weigh that much and are very slim also, possibly even smaller actually.
    I soldered a JST connector to the pads on the battery effortlessly, and as a bonus those batteries have a 3rd pad on them that may provide some useful batteri information to your target system.
    hope this helps some of you…
    I love Sparkfun and im not trying to take buisness away from you… but i love my planet more, not that i am vegetarian or anything.

    • oh… and one more thing…. (i know its alreay a long post)…. said nokia batteries are cheaper and cheaper every day… as more people move to smartphones (alot of them with internal batteries) retail stores a left with old-New stock of these.
      Here in Panama, i can find them for as little as 3 bucks, not a bad deal!

  • Can I charge this with the “LiPo Charger Basic - Mini-USB” (sku: PRT-10401) ??
    It says “2C continuous discharge” is it ok to use it in a circuit that only needs 400mA?? As far as I can tell it is ok.

  • possible to get matched sets for packs? Looking for 3.7v and 3-4Ah, but in a long narrow package

  • can i buy this battery without the leads?

  • This is the equivalent of 973 Farads. The only downside is the un-capacitor-like charge time…

  • what’s with the ASCII version of the picture?

  • DO NOT DROP onto sharp objects. A little project with one of these that I was making just fell of the table and impacted the sharp edge and made quite a spark (and not a fun one). Fortunately everything still works, including the battery despite the punctured shell.

  • Hi! I have backordered a couple of these batteries. Any idea when they will be back in stock?

  • For free batteries, go to an electronics store. Get the phone number of a battery recycling company, and call them to get (almost) free batteries.

  • will the lipo be drained below its minimum voltage if i use them in the NCP1400-5V Step-Up Board?

    • Good questions. Email technical questions to if you don’t get an answer here.

  • I am trying to recharge my “Polymer Lithium Ion Battery - 1000mAh” with the “LiPoly Charger - Single Cell 3.7-7V Input” using the USB port. So far the charger doesn’t seem to do anything since the “status” LED is off and the voltage across BAT and GND terminals is at 1.1V.
    Any ideas?
    Thank you

  • Hi,
    I got this battery and hooked it up with the charger card w/Solar Panel and connected to minty boost. From Minty Boost is the Arduino attached to Piano kit on one side and a circuit to convert 5V-9V on the other side which powers the amp. Can’t keep the thing charged. Works great as long as I’m in the sun. 2000mAh battery ? So it can provide power to the amp and the Arduino board & piano insert ?

  • Is this battery compatible with the MCP73861 Charger IC? (or I guess the other way around) If so, Would I need to get the MCP73861 or MCP73863 for coke or graphite anodes respectively.
    Lastly, Is there anything better to use than this chip to charge this battery?
    Thanks in advance,

  • What’s up with the dimensions of this thing? The specs say it’s 53mm x 33mm, but from the scale reference photos it looks more like 26mm x 16mm… That’s a big discrepancy!

    • Hi,
      Thanks for pointing this out. That is an interesting mistake. I think the photos for a different battery may have been used on this product. I will submit this for a correction, and we will get the proper specs posted up. I would trust the description over the photo until we get a definitive measurement.
      Sparkfun Tech Support

  • I'l have another go. i found that the programme seemed to run on the micro however there was not enough power to allow the UART to transmit to my laptop

    • The Batteries measured 3.95V. I charged them anyway and the 1000 mAh works great. the 100 maH doesn’t quite have the discharge rating and the UART transmissions are all garbbled.

      • I find this hard to believe as well. I have used a ~800mAh lipo that powered an Arduino, an accelerometer, a small servo, 6 LED’s, 3 other sensors, and some other junk, and the battery only needed an initial charge and hasn’t been recharged for months. It’s not always on, but has plenty of power for multiple hours. Can you measure the current draw on your system?

  • I tried to run this battery to power a ATmega328 10MHz an ADXL345, a IXZ500 and a microSD card.
    i doesn’t seem to have enough juice to do this. would the 2000 mah be better? I don’t really understand the C5 discharge variable in the datasheet

    • Really? 3.7V with a regulator to 3.3V should very adequately run those components. Actually, 1000mAh should run that system for multiple days. Your system probably uses ~30mA (depends heavily on what you’re doing but let’s assume).
      1000mAh / 30mA = 33.3hrs.
      Have you charged the battery? What voltage do you see on the battery terminals when it’s disconnected? Anything less than 3.6V means it’s pretty low on charge.

  • I want to have a aprox. 6V rechargeable power supply for my “spy” robot. All of the Polymer Lithium Ion batteries that SparkFun sells are only 3.7V, all parallel, no batteries in series. Would it be alright to connect two or three of these packs in series? The tutorial uses two of these batteries in series so I’m assuming that no harm will come if I do hook these up that way. Thanks.

    • Yes, it would work. As far as a boost regulator goes, you should check out this one.

    • Yeah, that’d work. I’m doing the same kind of thing (a little robot car) and need high amps.
      You might also want to look for the step up chip on here. I think it looks good.

  • Is a specification sheet available for the protection circuit? Especially for the voltage and over-current thresholds.

  • I was troubleshooting a prototype and shorted this battery. The current cut off instantly. Checked it with a meter and no juice is coming out of the battery, even though it had plenty of power.
    I assume I triggered some safety fuse, but is there any way to reset it or did I just ruin the battery?

    • That is the protection circuit. Typically you either need to release the load (just unplug the battery) or charge the battery for a second to get it should let go.

  • jst connector is very tight. Have to pull it out of charger board as well as LiPower board with needle nose pliers. Eventually this will fail and need a new jst.

  • I ordered this battery it it is good at doing what it does.
    My only concern is that the jst connector was ruined when I connected it to the li-po charger. Also it was a bit scratched up when It arrived.
    Overall it is a great buy.

Customer Reviews

4.5 out of 5

Based on 4 ratings:

5 star
4 star
3 star
2 star
1 star

Battery meets my expectations. Working fine.

Battery fine. I forgot that LiPo battery delivery has restrictions that increase cost and delay. I guess this is a fact I need to live with.

Battery Works with Intel Edison

Connected this battery to my Edison mini-breakout board. The header is a tight fit and the holes are almost a too wide but applying a little pressure it will fit.

nice battery

this battery is delivering the power I need in a small package. still in the early prototype stage but I think it is going to be the production package.