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Regenerative break warning sign

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It’s fine to reboot whenever needed, but since you charged to 90%, if it was below or even near 60 degrees where you are at, and the car was cold-soaked to that temperature, you would expect to see this message, along with a lot of dots on the left hand side of the regen/power bar. It’s totally normal.

Park your car in an attached garage if you want to reduce the occurrence rate. Summer is coming though so should be fine until fall.

If you're getting reduced regen from a cold pack in the morning, one thing you can do to reduce it is to schedule your charging so it ends shortly before you leave. The pack will be heated passively by the charging process, and the car may choose to heat it actively as well if it it's cold enough.