The answer depends on whether the system has the (optional at purchase) Thunderbolt 3 port.  Full compatibility with that dock requires at thunderbolt port. 

Otherwise, it should work even without one, but at lower speed and with a reduced set of features.

Uh? How does this relate to the battery issue?

My battery used to charge at 100%. Few days age, I noticed it dropped to 80% and remains unchanged. Also the adaptor signal light on the laptop disappear. So, I did the following:

1. I updated Microsoft ACPI

2. I uninstalled adapter and reboot the system

3. I extracted battery report

4. Besides I did run SFC scan as well as DSIM

As you might heard it before, since I plugged my laptop all the times, what is the benefit of the battery? It must be some benefits I am not aware of.

I do appreciate your help in this regard.