Adafruit Micro Lipo - USB LiIon/LiPoly charger - v2

by Adafruit

Oh so adorable, this is the tiniest little lipo charger, so handy you can keep it any project box!

Its also easy to use. Simply plug in the gold plated contacts into any USB port and a 3.7V/4.2V lithium polymer or lithium ion rechargeable battery into the JST plug on the other end. There are two LEDs - one red and one green. While charging, the red LED is lit. When the battery is fully charged and ready for use, the green LED turns on. Seriously, it could not get more easy.

Charging is performed in three stages: first a preconditioning charge, then a constant-current fast charge and finally a constant-voltage trickle charge to keep the battery topped-up. The charge current is 100mA by default, so it will work with any size battery and USB port. If you want you can easily change it over to 500mA mode by moving the slide switch on the top over to "High / 500mA" mode, for when you'll only be charging batteries with 500mAh size or larger.

For use with Adafruit LiPoly/LiIon batteries only! Other batteries may have different voltage, chemistry, polarity or pinout.

  • Comes assembled and tested with a free bonus JST cable!
  • 5V input via PCB-style USB connector
  • For charging single Lithium Ion/Lithium Polymer 3.7/4.2v batteries (not for older 3.6/4.1v cells)
  • NEW: 100mA charge current, adjustable to 500mA by flipping a switch, no more soldering a jumper closed
  • Free 2-pin JST cable included!

The MicroLipo charger can get hot during charging. Grab it by the sides and unplug then let cool before removing the battery - take care not to touch the components during charging!

Batteries not included.

Technical Details

Revision History:

  • As of October 31, 2022 – Adafruit have updated this PCB to have a sliding switch to change charging rate from 100mA to 500mA without soldering closed a jumper. JST PH connector may be tan or black.

Details: