Creative Commons images are CC BY-NC-SA 3.0

Description: This is a very small, extremely lightweight battery based on Lithium Ion chemistry, with the highest energy density currently in production. Each cell outputs a nominal 3.7V at 400mAh! Comes terminated with a standard 2-pin JST-PH connector with 2mm spacing between pins. These batteries require special charging; do not attempt to charge these with anything but a specialized Lithium Polymer charger.

The 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.

Note: Due to the requirements of shipping these batteries, orders may take longer to process and therefore do not qualify for same-day shipping. Additionally, these batteries cannot be shipped via Ground or Economy methods to Alaska or Hawaii. We apologize 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.

Dimensions: 1.06" x 1.48" x 0.2" (26.5mm x 36.9mm x 5mm)

Weight: 9g


  • Rated Capacity: 400mAh
  • Nominal Voltage 3.70V
  • Max Charge Current: 1C (400mA)
  • Normal Charge Current: 0.2C (80mA)


Recommended Products

Customer Comments

  • Just curious why you guys call your batteries “Polymer Lithium” instead of “Lithium Polymer” like everyone else. I’m an RC hobbiest and LiPo batteries have been around for years. I’ve never seen one advertised as “Polymer Lithium”. If you Google it you’ll see you’re the only ones. Is there something about the particular formulation you use that warrants the variation in the naming?

    • We just checked out IATA Regulation book and we found Polymer = Ion (with Alloy = Metal). So yes, you are right the name of these products is weird and redundant. Currently, the title says “Ion Lithium Ion Battery” which is no bueno. It looks like this was an original name that was never changed or updated.

      Thank you very much for pointing this out we’ll get this changed on all of our products.

Customer Reviews

No reviews yet.