LiPo Battery Charger Basic Micro-USB MCP73831T Board SparkFun

The SparkFun LiPo Charger Basic is stripped down of all features and just does one thing well – charge 3.7V LiPo cells at a rate of 500mA. It is designed to charge single-cell Li-Ion or Li-Polymer batteries. Check the datasheet below to see if it will work with your battery.
Resources
Schematic
Eagle Files
Datasheet(MCP73831T)
GitHub