Lipo Charger is designed to take power from a micro USB connector and charge a single-cell LiPo battery. There are five switchable charge rates, from 100 to 500mA. The 100mA rate is the best choice for our 120mAh and 160mAh cells, the 400mA rate is ideal for our 400mAh cells, and the 500mA rate is best for our 850mAh and larger cells. We OEM this version of LipoCharger from SparkFun.