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Modern cars with 'Intelligent Battery Sensors' will shut down non essential consumers to preserve enough battery life to start the car, BMW's will even put things like heater fans and heated rear windows at half efficiency to allow more charge to go to the battery when it is running.
And I just put a sock filled with cat litter in the MX-5 to stave off unwanted moisture... Maybe modern cars are better.
That sort of doesn't make sense. If there is enough in the battery to start it, the clocks should not reset.
There maybe an underlying issue.