DEV-13626 Datasheet PDF - SparkFun Electronics

Introduction
   Free your Photon from its USB cable by powering it through the Photon Battery Shield. The Battery Shield has everything your Photon needs to run off, charge, and monitor a LiPo battery.
   The Shield features two unique IC’s: an MCP73831 charge controller and a MAX17043 LiPo fuel gauge. With them, you’ll be able to charge your battery through USB and monitor its voltage and state-of-charge.