My battery has been fine, even with 2 week trips. There is no reason a battery can't sit a month or more and still hold a charge. I do a lot of boating, and the boat batteries (just car batteries) sit for very long periods when I can't get to the boat. No issues.
On a side note, it seems the hot weather has been killing car batteries in Chicago left and right. Had to jump my wife's car last week, a co-worker's battery just died, and my doorman said that three people have asked him for jumper cables this week as well.
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2013 Cadillac V-Wagon, RIP Z
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