Closing the Backup Battery Button enables charging of the backup battery. Which option matches this statement?

Closing the Backup Battery Button enables charging of the backup battery. Which option matches this statement?

• A. False
• B. True
• C. Only when GPU is connected
• D. Charging occurs when the backup battery contactor is closed

Answer: (B)

Closing the Backup Battery Button completes the charging path to the backup battery by energizing the charger relay and connecting the battery to the aircraft’s power source. Once this switch is closed, current can flow into the backup battery to replenish it, independent of whether GPU power is connected. The GPU being connected is not required for charging, so that option is not correct. The action of closing the button directly controls the charging circuit, which is why the statement is true.

Closing the Backup Battery Button completes the charging path to the backup battery by energizing the charger relay and connecting the battery to the aircraft’s power source. Once this switch is closed, current can flow into the backup battery to replenish it, independent of whether GPU power is connected. The GPU being connected is not required for charging, so that option is not correct. The action of closing the button directly controls the charging circuit, which is why the statement is true.