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It was -24C / -11F when I started my M240i after sitting outside all day yesterday, I received the "Battery discharging while stopped" message, but otherwise everything else was fine. I've had the message a few times since the car was new, always when below -20C and more likely as the temperature approaches -30C or below.
Our cars are both sitting outside all day today while I build a trailer inside the garage with the heater on. By the time I move them back inside tonight (after taking them for a drive until fully up to temp and putting some charge back in the battery), it should be -26C / -15F. The high temp today is meant to be -23C, I will see if I get the message again.
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