G5 batteries charging issue

[Barb182]

Has anyone had a problem with G5 batteries having unusually low charge reading due to cold weather, and brief hiatus flying or have an opinion about this?

First 2 flights of 2 hr each after hiatus, battery charge read mid 60% for both after shut down (but read 100% if power button pushed at end of flight). At beginning and end of 3rd flight, charge read 96-100% range.

My G5 batteries were installed in 6/2021 and 9/2021. They charged fine through end of 12/2023. Had to take month of January off from flying due to weather and other factors. Plane is in an unheated hangar. There was a week in January where temps were in the 15-30F range. Most of month was 30-45/50F.

I think cold weather and lack of flying for 4 weeks caused the low charge and somehow caused discrepancy glitch between automatic readout and menu power readout.

 

[Mikey52]

They may not fully recharge in cold temps.

 

[chemgeek]

Have you checked "(2022) Service Bulletin 22013 Rev A: G5 Backup Battery Discharge" to see if your unit is affected? A large number of early G5 units had an idle battery discharge issue which is fixed by this service bulletin. Unfortunately, I think the freebie fix offered by Garmin expired last February. My G5s were affected, and I complained to Garmin for over a year until this SB was issued. They would lose about 2-3% of charge per day when idle with the master power off. I sent mine in and they exchanged them for newer units. My G5s now read 95-100% backup battery capacity even after a month of more of idleness. They always charge back up to 100% after a flight of more than 15-20 minutes.