The datasheet of the Expansion Board is available as a PDF File.
Expansion Board 2 Datasheet
The pinout of the Expansion Board is available as a PDF File
Expansion Board 2 Pinout
Be gentle when plugging/unplugging from the USB connector. Whilst the USB connector is soldered and is relatively strong, if it breaks off it can be very difficult to fix.
The Expansion Board features a single cell Li-Ion/Li-Po charger. When the board is being powered via the micro USB connector, the Expansion Board will charge the battery (if connected). When the
CHG jumper is present the battery will be charged at
450mA. If this value is too high for your application, removing the jumper lowers the charge current to