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This cable is kinda fascinating it has an integrated boost converter so you can plug it into any USB port (from a computer battery pack etc) and it will give you a higher DC voltage! It's a handy way to power 12V powered devices with a centerpositive 2.1mm DC barrel jack from a USB port. We also have a version that provides 9V and if you just need a passthough cable here's one for 5VDC.

These are rated at 500mA output but you can go a little higher we pulled 700mA and we got a little voltage droop but it worked fine. Probably best not to draw 700mA continuously though!

Here's our measurements for various current draws when we set our bench supply to provide a steady 5V voltage

50mA (12.4V output) 150mA 83% efficiency
100ma (12.4V) 290mA in 86% efficiency
200ma (12.3V): 570mA in 86% efficiency
300ma (12.2V): 870mA in 84% efficiency
500ma (12.1V): 1500mA in 81% efficiency
700ma (11.4V): 2140mA in 75% efficiency

So overall there's a 85% efficiency at low current draw that drops do about 80% at high current use. There's also a 3 mA quiescent current. Note that often times the USB port voltage can droop too and in addition you may have power losses with any thin or low quality cables with high resistivity!