Is there anything an Arduino can't do? Well, for one, most of them can't be powered directly from a 3.7V LiPo battery; much less charge and monitor that battery. The LiPower Shield takes care of this by combining the functionality of two of our favorite battery power boards: the Power Cell and the Fuel Gauge. Project description, more information and ordering can be found at https://www.sparkfun.com/products/10711 Datasheet: http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Prototyping/MAX17043-MAX17044.pdf Datasheet: http://www.sparkfun.com/datasheets/Prototyping/Batteries/MCP73831T.pdf Datasheet: http://www.sparkfun.com/datasheets/Prototyping/tps61200.pdf Example Code: http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Dev/Arduino/Shields/LiPower_Shield_Example.ino Product Video: http://youtu.be/6Czv7msdRzc?t=12s