When you get to the screen and it says not ready charging. Take it to the dealer an have them replace the batteries. I had this done on mine and it was at about the same miliage you have.
Has anyone had a problem with their backup camera. Mine will some times go blank when put in reverse. After it has been parked for awhile and I start it up again it is working. Any thoughts? I would take it to the dealer but they told me it would have to be not working for them to look at it.