If you need to charge LiPo batteries, this simple charger will do just that, and do it fast! The SparkFun USB LiPo Charger is a basic charging circuit that allows you to charge 3.7V LiPo cells at a rate of 500mA or 100mA. It is designed to charge single-cell Li-Ion or Li-Polymer batteries.
The board incorporates a charging circuit, status LED, selectable solder jumper for 500mA or 100mA charging current, external LED footprint, USB input, two pre-installed JST connectors for SYS OUT and BATT IN, and (back by popular demand) a barrel jack connector.
There is also a ‘SYS OUT’ with a pre-installed JST connector which allows you to connect the charging circuit directly to your project so you don’t need to disconnect the charger each time you want to use it.
* [Eagle Files](https://cdn.sparkfun.com/datasheets/Prototyping/USB_LiPolyCharger_SingleCell21.zip)
* [Hookup Guide](https://learn.sparkfun.com/tutorials/lipo-usb-charger-hookup-guide)
* [GitHub](https://github.com/sparkfun/USB_LiPolyCharger_SingleCell/tree/v2.0) (Design Files)