All Experimental and Light-Sport Aircraft Garmin G5 Electronic Flight Instruments with software version 7.10 (and earlier) installed with a backup battery with the ‘Show Battery Status’ configuration set to ‘When Using Battery’ are affected.
This Service Bulletin does not apply to certified G5 installations.
This service bulletin contains instructions to update G5 software and confirm the backup battery status.
Mandatory: This service bulletin must be incorporated as soon as possible for affected installations.
G5 Software Version 7.70 fixes a problem with the backup battery indication as described in Garmin Service Alert 21113. Please see attachment linked below for further details.