Got the 12V battery in the Chevy Volt replaced today. The folks at Canadian Tire ran an electrical system test and said there did not appear to be any other issues (e.g. a faulty switch causing power to draw when the car is off). Replacing the 10-year-old battery seems to have fixed other "glitches" we noticed, like the console computer periodically suspending, then coming back online.Cautiously optimistic...