This is really the first issue I've run into with this car. Car did not start this morning after sitting overnight in negative single digit weather. Battery is a new interstate battery only about 9 months old. Ended up having to use a 50 amp booster/charger to get it going. Battery had a full charge from the previous night since I had just driven back from a ski trip.

Has anyone had trouble getting these cars started in cold weather? Should I get the battery tested?

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'01 M3
'02 X5 4.6is