Polo 6C USB Charge Port (Slow Charging)

[TheDSider]

Hi guys,

Just wondering if anyone has any experience with upping the output of the built-in USB port in their cars? My new Polo has the USB port but it charges my Galaxy S4 extremely slowly - a couple of percent in about 30 minutes with nothing running, and it actually drains if I have Bluetooth streaming and GPS running. I'm guessing the output is 5V 0.5A MAX, and I've tested with a few chargers at home and 1.0A seems to work OK, anything higher will let me run whatever I want and still charge pretty quickly.

I could buy a cigarette lighter plug-in that's 1.0 to 2.1A and achieve what I want but I'd prefer to keep using the USB port - though I'm assuming it's powered directly off the head unit and so bumping the power output wouldn't be possible.

Any guidance?