This system cannot be charged by USB -- you will need to leave a Dell OEM adapter connected to it to charge it (in addition to the one connected to the docking station, or alternately with it).  And leaving the adapter disconnected will result in a substantial performance reduction of the system -- it just cannot run at full speed on battery only. If you're looking for the ability to power the system over USB, you need a newer system with that feature.  
Hello everyone, I have a technical query regarding screen connectivity. I want to connect two screens: one with an HDMI port and another with mDP to DP capability. Unfortunately, my laptop does not have a USB-C port. I would like to know if the Dell WD15 USB-C Dock with a 130W AC Adapter would be compatible with my laptop if I were to use a USB to Type-C female adapter. Thank you for your attention.
Will this work with my Dell Inspiron 7567