Tiersten is correct. LiPo has no memory, has a time limited life (4-ish years from assembly), limited charge/discharge cycles (400-ish), can be left plugged into a charger forever, will charge more slowly from a low power USB port and may not charge at all from a very low power USB port. For 'fuel gauge' charge level indicator, once per month discharge to charge required indication to calibrate the 'fuel gauge'.
http://batteryuniversity.com/learn/