Get a charge only cable, i.e. Naztech Micro USB Charging Cable. The phone will then see the charging source as an outlet and not a usb port.
Also, recommend the Miccus ChargeBlock USB Car Adapter CBCAWC-2A. Make sure you order the CBCAWC-2A as it's 2 amp model. With this charger and the above cable, or similiar cable, you can run everything simultaniously and it will fully charge up the battery.
Also, recommend the Miccus ChargeBlock USB Car Adapter CBCAWC-2A. Make sure you order the CBCAWC-2A as it's 2 amp model. With this charger and the above cable, or similiar cable, you can run everything simultaniously and it will fully charge up the battery.