Can you charge this particular tablet (Sylvania SYTAB7MX) with a car charger? I bought one that plugs through the AC power port (as I read in other posts that you can't charge these machines through the USB) but it did not work. I travel with this alot and do not want to be limited to just the wall socket. Also, is this unit compatible for the android market site to download apps? I was able to install amazon apps store and it works fine but everytime i want to download an app through the android market, it says there is no device associated with this account or email or something like that. What is it I am not doing? Any suggestions would be greatly appreciated.