GL300VC User ManualTRACGL300VCUM001 - 7 -2.4.2 External Battery InterfaceThe Pin 8 on Mini-USB connector is for external battery and named as EXTBAT pin, It can beconnected to 3.7V Li-ion or Li-Polymer battery to power GL300VC.2.5. Ignition DetectionThe Pin 7 on Mini-USB connector is for ignition detection when GL300VC is used in vehicletracking application, It is named as IGN_IND pin.QueclinkConfidential