GV55N User manualTRACGV55NUM001 ‐ 13 ‐To use the GV55N backup battery, the switch must be at the ON position. Switch on thecase and ON/OFF position are shown below.Figure 7. Switch and ON/OFF positionNote:1-The switch must be on the “OFF” position when shipped on an aircraft.2-When the switch is on the “OFF” position; the battery cannot be charged or discharged.3-To reset the device: Remove the external DC power and second switch off the backupbattery. And then supply the external power and switch on the backup battery.PWR (PIN1) / GND (PIN2) are the power input pins. The input voltage range for thisdevice is from 8V to 16V. The device is designed to be installed in vehicles that operate on12V vehicle without the need for external transformers.3.5. Switch ON the Backup Battery3.6. Power Connection