Happens to me every winter. Went to dealer 2 times and they checked the battery and all was good. They are telling me than I make short commutes to work (14km/9mi) and the battery can't fully charge. Got a Noco charger and I'm plugging it 1 night every few weeks during winter to keep the battery at 100%.
They are also telling me that "with all electronics in cars these days, it's normal" and also, since the battery is in the trunk and not besides the motor, it's always staying cold and may be getting false reading for the battery discharged alert to come on...
Anyway, with my Noco I'm all good and car has always started fine, even at -26c/-14f yesterday.
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