I have a 2011 TC deluxe wagon. I plug my cell phone, gps into the cigarette lighter and the extra electronic plug on dash.. Generally, I drive the TC most days and all has been fine. However, now that it is winter I have driven my Subaru with all-wheel drive and let TC sit.
I went to drive it yesterday and battery was totally dead--AAA said it was down to 2 volts. I was going to local Ford anyway for service so they checked everything out. Turns out that those plugs are not ever off so if the vehicle isn't used for a while--mine was no more than a week--it will drain the battery.
Haven't ever seen that information in the owners manual.
So word to the wise. If you aren't going to use for a few days--unplug electronics.
Donna
Gig Harbor, WA