Hi Guys, I have an issue with the Tom Tom app on the iPhone as it is a battery killer which is expected as they recommend that you connect to a 1.5a or 2a car charger in order to keep the battery topped up. In my car this is not a problem as I can use the 12v power port with a sub adapter in it then stream my music and directions via Bluetooth which works well. Now here is the issue when driving the works van I have a requirement to have the works phone on Bluetooth so I can answer the phone legally when driving. This means in order for me to put my music and direction through the van speaker I need to use it media player mode via the vans USB port which is more than likely to be a 500ma port. So I would have to use a 12v to usb charger cable from the power socket to in the van but can't then output the audio via the car stereo (probably use aux out) but then you loose the steering wheel controls. Is there such thing as a usb power booster, bear with me on this one. The device sits inline between the phone and the car USB port, it then has a fly lead/power cable that goes to your 12v power port and sucks down the power from that port yet lets data pass through to the van/car. I ask this because I have heard the new usb 3.0 spec allows up to 1200ma from a single port in high power mode and from what I have read the iPhone supports this the only side effect is that the usb data rate slows down so large data transfers are quicker. I have tried googling but I don't know what to look for so the results aren't too helpful. I know home made chargers like the minty boost puts 2v on the usb D+ and D- lines to tell the phone to charge but that would mean data doesn't work. EDIT: Something like this where it draws power from a 2nd usb port, but how would the iPhone know that its safe to draw high current and still use data.