Is it possible to charge Asus TF101 from a car cigarette lighter with a USB switch?

Question

Charger

I want to charge Asus TF101 from a car cigarette lighter. Option 2:
1. Buy a device sharpened for this
2. Buy a universal charger with a switch to USB.
The first option is expensive. Yes, and a bunch of wires in the machine do not want to have.
The second one is more interesting (I have several devices that can be charged from USB), but so far I have not been able to find a suitable option. I tried this option (output current 2A). But he did not charge the tablet. Although the iPhone 4 charges excellently from it.
Someone had the experience of purchasing a suitable car adapter with a switch to USB for this tablet?

Answer 1

I almost had an experience with a subject.
My car has two cigarette lighter sockets, 6 and 12 volts.
Well, there is a universal adapter to USB, I charge smartphones from it.
So, the 6-volt socket does not stupidly charge my Transformer. Doesn't charge at all. Well, I somehow don’t dare to stick it in 12V.
In general, the same problem. I can't give you any advice, but I'll keep an eye on the answers here.

Answer 2

USB port (2.0) - 5V * 0.5A = 2.5W * h. / they say 3.0 normally charges because about 0.9A The charger
gives out - 15V * 1A \u003d 15W * h
From 2.0 it is charged only in the off state.
I would not dare to charge with a current of 2A. It is likely that he did not charge due to the operation of the protection.