Very interesting find there! I just ordered a Brodit kit for the car and this time round, I went for a active one so I just slot the phone in and it charges.
I will have to find out what current it gives out because I would potentially use navigation especially as I am recently finding the Audi one can be really crap!
On another note, I bought a premium HTC original one - it lasted all of a month and bearing in mind I must have used it 3 times in total...Was shocked!
What I found was that I had to hold it in a certain way to charge however, it was NOT the charger and it was NOT the phone.
For example, the charge worked fine on a Diamond1 but not 2.
For example, the phone worked with USB cables so its not the port.
Let's see how the brodit kit goes!