Backup Battery Check - Garmin GI 275 Maintenance Manual

5.7.3

Backup Battery Check

This procedure will analyze the voltage and discharge qualities of the installed backup battery. The
procedure is required to be completed on initial installation and every 12 calendar months when a backup
battery is installed in the system. A fault indication message will be displayed in Normal mode until this
procedure is completed.
NOTE
The battery rundown test may take up to 150 minutes to complete.
NOTE
The battery rundown test date is reported in UTC.
To perform the backup battery test, complete the following steps:
1. Power on each GI 275 with an installed backup battery in Configuration mode.
2. Navigate to the Backup Battery Test page (Calibration/Test → Backup Battery Test).
3. Touch the Before Test Checklist button.
4. Verify that "Discharging" is not displayed under Battery State.
5. Touch the Test Date button and enter the current date.
6. Complete the on-screen checklist. Touch each checklist item once completed. Once all checklist
items have a green check mark, touch the Back button.
7. Touch the Start Test button and follow the on-screen commands.
8. The GI 275 will power off automatically when the test is completed.
9. Power on the GI 275(s) in Configuration mode and navigate to the Backup Battery Test page.
10. Touch the Test Results button and then Rundown Test Results button.
a. The results are displayed the date the test was performed and how many minutes until the
battery ran down.
11. A rundown time of more than 30 minutes is considered a PASS.
12. If the test results were not a PASS as described in the previous step, it is recommended to replace
the battery using the procedure in Section 5.2.
190-02246-C2
Rev. 3
GI 275 Part 27 AML STC Maintenance Manual
Page 5-25