Here's what i'm wanting to do.

I have a Acer Iconia A500 tablet. I want to plug it in, in the car, but it has a barrel plug and I don't want to buy an inverter. The car adapters are expensive for what they do.

I already have a 2.1 amp usb car charger meant for the iPad: http://www.amazon.com/Kensington-K33497US-PowerBolt-Charger-Compatible/dp/tech-data/B003PU01M4/ref=de_a_smtd

And i want to use this usb cable from the 2.1 amp port to plug into the A500: http://www.amazon.com/gp/product/B00304DZ7I/ref=ox_sc_act_title_2?ie=UTF8&m=A1HPBDJJIXKXS7

Here are the specs on the original wall charger if that helps: http://www.phihong.com/assets/pdf/PSA18R.pdf

The usb cable says it's 5v, but the original charger says it outputs 12v. But since it's just a cable... wasn't sure if that really made a whole lot of difference since it's only 1.5 amps from the wall charger.

Is it possible to use that usb cable through the powerbolt car charger, to charge the A500?