My coworker upgrade the battery on my DROID RAZR MAXX. It now has a 3800 mAh battery. My old one was dying after 6 hours. I love the new battery. Unfortunately, none of my docks would fit, so I had to buy a new vehicle dock. I bought the iBolt dock, which has the correct USB port and also splits into a USB charger and audio port. How can I force my audio to be played through USB? Edit: I'm not so sure if the USB port on the iBolt Vehicle Dock/Charger is correct. However, it DOES fit. The Motorola one would automatically pull up the Car Dock app, while this one does not. What triggers the default Car Dock app to open? Edit #2: It appears as if the factory Vehicle Mount has an extra pin in the USB port which triggers Vehicle mode. That's what I've read. Therefore, any 3rd party mount will not work.