3.7V/4.2V LiPo Charger with USB Type-C Plug

by Solder Party

A small 3.7V/4.2V LiPo Charger with a USB Type-C Plug, no cables needed!

This board can be used to charge 3.7V/4.2V lithium polymer (LiPo) and lithium ion (LiIon) batteries. The JST connector is very common for these kinds of batteries. You can also use the header pins to skip the connector and charge the battery that way.

The two LEDs show the status of the charging process. While the battery is charging, the "Charge" (orange) LED is on, once the battery is fully charged the "Done" (green) LED lights up. It is normal for either or both LEDs to be on if no battery is connected.

See the MCP73831 datasheet for more details about the charging process.

By default the battery is charged with 500mA, if you want to change the charge current you can change the R2 resistor. See the schematics or the datasheet for more information.

What do you get

  • An assembled LiPo battery charger board with a USB Type-C Plug
  • A male pin header

Specs and Docs

5 customer reviews

8 months ago
I love this board. Tiny, breaks out all the GPIOs, LiPo charging built in. What’s not to love? If you don’t want the RGB LED, you can cut tracks easily to save a few micro Amps.
by Michael about RP2040 Stamp via REVIEWS.io
3 years ago
Excellent board! I can now test out every single GPIO pin the RP2040 device offers. There were a few features that I could not try out on the RP2040 because most of the boards that are available always leave some of the GPIO pins out. This is the first board that brings out all 30 GPIO pins. This board also has some nice extras, like a battery charger, a Neopixel, etc. This could be my new favourite board!
by Anonymous about RP2040 Stamp via REVIEWS.io
3 years ago
Delivery just arrived and I am dager to get started during weekend. Excellent support
by Christer about RP2040 Stamp via REVIEWS.io
3 years ago
RP2040 stamp. -excellent. Small pi-pico that is easy to use. Delivery was quick as well.
by Andrew about RP2040 Stamp via REVIEWS.io

User photos