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Powering a USB hub with a 12v car battery

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rizay

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12v usb hub

I use my laptop in my car on a daily bases. It only has 1 usb port and I use about 5 usb devices. I bought a powered usb hub. It works ok without power if you only use one or two usb devices. However, when I use more devices, they don't operate correctly. And it doesn't have enough power to operate my external dvd rom. Unfortunately, the power adapter is for ac current.

I have searched for a 5v dc power supply that carries enough current to power this hub but with no luck. There are lots of 5v dc power plugs but many only hold about 500mA.

I have one of these that I was hoping I could somehow increase the mA to supply my hub:

19_1227868343.jpg

https://obrazki.elektroda.pl/19_1227868343.jpg
[/img]http://obrazki.elektroda.pl/19_1227868343.jpg

At the bottom of the pic, it has a usb charger. It carries 5v dc at only 500mA. How can I increase the mA to supply my hub?
 

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