Hi all, The Surface Pro comes with this 48W charger and no one has written about its specs in detail. Does anyone know the output voltage of the charger? I guess it has to be 16V or 19V, but as the surface pro isn't available in Germany yet, I have to ask this question here. I was thinking about using an external notebook battery like this one Amazon.com: Ultra Capacity High Quality 33600mAh Portable Charger External Battery Pack Power Bank Charger For Laptops and Notebooks - Compatible with Dell HP Sony IBM Lenovo Samsung Toshiba Acer Compaq Fujitsu Gateway Lition Asus: Cell Phones & Acce But it depends on the specs of the original surface charger. I would appreciate it if someone could measure the voltages of the adapter. Thanks in advance.