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It has to do with the resistance in the cable and connectors which causes a voltage drop. A long thin cable can cause quite a big voltage drop. One of the reasons that the OEM charger is specified to 5.2V is to be able to keep the voltage above 4.5V. You can read more about it on...

` At least according to the Swedish Microsoft page, the docking station is rated at 48W so without owning it myself and not being very familiar with the usb protocols my guess is that it is charging through the usb 3.o port (I can only see displayport and usb 3.0 connectors on the docking...