Easy: They are kept under cover to keep dust, pets and children off of them; that way they come out in the spring clean and ready to go.
You do not use a charger, but rather a maintainer; the later of which brings the battery to full charge and then shuts off until needed.
The reason you do not want to start the car periodically is that will cause fuel dilution and moisture build up in your oil and on critical parts. Bad idea. Change the oil and filter just before putting it into hibernation, fill it up with stabilized fuel, run it for 10 min. to circulate the fuel, put it to bed and leave it alone until spring.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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