Lithium Ion Battery - 400mAh

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: 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.

Weight: 9g

  • Rated Capacity: 400mAh
  • Nominal Voltage 3.70V
  • Max Charge Current: 1C (400mA)
  • Normal Charge Current: 0.2C (80mA)
  • 1.06" x 1.48" x 0.2" (26.5mm x 36.9mm x 5mm)

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.

  • How long will this battery last plugged into a blynk board?

    • That depends on what the Blynk board is doing and how much power it is pulling. This battery will provide 400mA for 1 hour, 200mA for 2 hours, 50mA for 8 hours, etc. Because the ESP8266 will take about 0.9mA during standby and up to 215mA for transmission (or 62mA to receive) and each I/O pin can provide up to 12mA it really depends on your project. As you can tell from the numbers having the board transmit constantly will really drain power quickly. Leaving it in standby and transmitting a short burst once per second will save a lot on battery life. For more information check out the graphical datasheet for the ESP8266 Thing Dev board.

Customer Reviews

4.8 out of 5

Based on 9 ratings:

Currently viewing all customer reviews.

Good internal protections

They are self protected and more safe, my best ones !

Great battery pack

Works well with the Battery Babysitter, powering a Pro Micro project.

great

worked as expected, and that is no small feat now a days

Used this to replace a similar battery...

I had a pair of Ausdom M04 wireless headphones that stopped charging. Ausdom support was non-existent. So I took the headphones apart. The headphone battery was a KPL503030 - unavailable, even from the battery manufacturer unless I wanted to buy 500. I saw this battery via Google search and decided to give it a try. Works like a charm!

I purchased 3 Lipo 400mahr batteries and made an 11.1 volt pack by binding then together and connecting then in series. I’m using them to power an HO locomotive on my model railroad and it’s working as designed. I’m using the appropriate charger and have had no trouble.

Great Purchase

Working great. I am using it to power the SparkFin Wireless Joystick Board.

Works as expected

Small and compact and works great. I’ll be using it to support a pool automation project. I’ll come back and give it a 5 star if it holds up to the Phoenix summer heat. :-]

Best Battery I Ever Owned

I have not owned many batteries in my lifetime but this has got to the one of the best batteries one could ask for. It’s small and smooth and holds lots of energy. Also, it works very well with the Photon Battery Shield. I had no problems with running a microprocessor off this little thing. 12/10 would recommend.

Great little batteries

Use these for GPS tracking and they last a good part of the day. Very reliable. Own several and none have failed yet!