2013 XK8 How do I restart the engine with a dead battery?

Let me first say that JAGS ARE A PAIN. You'll find the battery in the front of the trunk, behind the panel, but access to it is really difficult. So remove the rear seat back and you'll find the fuse box. attached to it is a hot cable that you can attach the hot jumper cable to. Then ground anywhere at body connections. Once jumped, the starter should turn and you can get where you need to go to check the battery's condition.