Ok so here is the deal. I place my DX into the Motorola car dock, activate navigation and Pandora. Then I plug in the charger (cigarette lighter) to keep a full charge. After a couple of hours I notice that the battery is not 100% anymore. It seems that the charger cannot keep up with the output. Also when I mount it in my car the battery is fully charged. Anyone else have this problem? PS. I drove for 8 hrs the other day doing the above stated and my battery was @ 40% when I got home.