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by sokoloff
932 days ago
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Some EVs will monitor the 12V battery and periodically connect the traction battery to the DC-DC converter to maintain the 12V battery when the car is parked for an extended period of time. (On the older Smart EVs, this doesn’t have a limit, so the traction battery will kill itself trying to maintain a weak 12V battery. There’s a firmware patch for it.) |
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This had me worried the first few times it happened. Then I found out it is a warning to mechanics/tow truck drivers/first responders that the high voltage system is energized.