LipoCC is a Coulomb Counter / Battery Gas Gauge PCB for use in single cell LiPo batteries which I designed based around the LTC4150 IC. The overall schematic and board implementation is fairly straight forward in terms of design and further details can be found within the Linear Technologies datasheet below. I developed this project as a launching point for including 4150 as part of a much larger future project and I wanted a chance to test the circuit design as a standalone design first.
LTC4150 Coulomb Counter/Battery Gas Gauge | (PDF)
Eagle files | (GitHub)