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I have a portable jump starter, battery charger tender, and a volt meter. It really depends on the car, but I've noticed that if you store the car in a underground garage the temp actually doesn't drop much and stays pretty stable. Vs I've had the battery drain on a car in a about a week in winter weather kept outside. But usually the car should be able to last at least a month before voltage starts to drop in the battery. I will just start it up drive it around a few times to bring it back up, or plug into the tender. Luckily for the last few cars I've stored, battery held up for the 3 4 months I've stored them for winter. You can always unplug the battery terminal also but I do agree it's a bitch depending on the car and how much drain it has, you most likely will have to reset everything and loose memory functions.
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