My ZDX battery is totally dead every day! I get this warning to shut everything down, and then I have to recharge it. I think I might have finally figured it out, though. I'm betting it's the Bluetooth thingy. It was probably using just enough juice to let the car start, but also causing the warning, and I'm guessing it would have eventually killed the battery completely. Gonna wait a couple of days to see if that fixes it, but I'm pretty sure it will.