There are two types of electrical currents, AC and DC. The AC current is more reliable and is used in all home electronics. But the DC current works better for smaller devices. All batteries run on a DC current, and that includes your car battery. If you need to power a device through your car, you may need a car power adapter. A cheap USB car power adapter is all you need to plug into your cigarette lighter to get a current capable of charging you cell phone. Have a look at the car power adapters available to get your favorite devices working while you're on the go.