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...where a bunch of geeks got together to make other people's ideas come to life.
This is a great little lithium battery charger based on the MCP73831 IC from Microchip. The board has a female JST connector which mates with all our batteries. To charge, simply plug in the micro USB connector to any computer or DC-USB adapter. It will charge that battery at a rate of 500 mA, but can be reduced to accommodate smaller batteries by swapping out the 2k resistor.
The board also breaks out all the pins of the USB connector in case you have a USB capable microcontroller. The board was designed to fit on the corner of a breadboard, where the power from the battery would be directed to the power rails of the breadboard, and the USB data and power pins would connect to 4 individual rows on the breadboard for prototyping.