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$ 4.50

Please note that this product has shipping restrictions to certain countries.

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In stock 99 in stock
4.50 1+ units
4.28 25+ units
4.05 100+ units
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Description: This is an extremely tiny and 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 40mAh. This may sound like not so much power, but the cell is really tiny… like, about half an inch square!

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: This battery is not available to ship to Alaska or Hawaii, or through any express services (2-day, overnight), or internationally. This is temporary! Check out our blog post for more information. Additionally orders may take longer to process and therefore do not qualify for same-day shipping. Sorry for any inconvenience this may cause!

Note: This item is non-returnable. If this item arrives damaged or is not functioning properly, please do not hesitate to contact us to see if further actions may be taken.


  • Rated Capacity: 40mAh
  • Nominal Voltage 3.70V


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Customer Comments

  • I make my own design with the LTC4081 from Linear or the STNS01 from ST.

  • How can you charge one of these little 40mah lipos?

  • I guess there is a mistake in the Datasheet. The black wire is written as + and the red wire is written as -.

  • What can we use to charge these? I don’t see any charger boards in your catalog that do anything under 100mA…

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