I can confirm the puny 12v battery is my problem. I hooked up a charger the other day, it said the battery was at 85%, okay. Charged to 100% then drove truck 30 minutes home, parked, plugged in, temps @ - 5degC, FAILED TO UPDATE.
Next test, attached 2nd battery (fully charged "marine" battery, normal car battery size) via booster cables and left in frunk overnight, plugged in, @-5degC, SUCCESS!
The OEM 12v batt just doesn't have enough capacity, even at relatively warm winter temps.
Hopefully they can come up with a fix to keep power during an update. Maybe Ford can add an onboard maintainer seperate of the main power circuit or a better battery.
Next test, attached 2nd battery (fully charged "marine" battery, normal car battery size) via booster cables and left in frunk overnight, plugged in, @-5degC, SUCCESS!
The OEM 12v batt just doesn't have enough capacity, even at relatively warm winter temps.
Hopefully they can come up with a fix to keep power during an update. Maybe Ford can add an onboard maintainer seperate of the main power circuit or a better battery.
