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This is not the popular approach around these parts, but this is what I do: I've got an old (15 years?) Sears trickle charger. I take the car battery cover off and leave it off during the winter (even on those infrequent occasions when I drive her). 'Bout once a month, I hook up the charger and leave it on overnight, then unhook it for another month.
Not particularly sophisticated, but it's worked fine so far (two winters).
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