battery is draining while plugged-in

That can indicate a heavy background process at work. For a very long time, Mac notebook batteries may contribute power even with on wall power if some very deamnding tsask is encountered.

You could have some useless anti-virus or so-called "cleaning" app at play, but some legit apps can also be "fat hogs at the trough."

We can play a protracted game of "20 Questions" with your about what is and is not working (could take days), or you can post a system config report. We can then make data-drive recommendations rather than generalizing or guessing. Fortunately there is a safe, secure way to do that.

We can quickly and within the confines of these text-based forums help you determine what issues are at play if you use EtreCheck Pro t, available here:

https://etrecheck.com/index

to create a safely "scrubbed" report

The free version will do nicely for this purpose, although the app is worthy of our financial support. We can see hard data about drive performance, software issues, and RAM usage. Etrecheck is the development of a long-serving and trusted contributor here expressly for safely displaying information in these forums to help us help you. It will not reveal any personal or secure information.

Forum changes made in Late 2018 mean we can no longer conventionally paste long text reports directly into a thread. Fortunately, one of the tools in the text entry box toolbar makes that possible. See this excellent User Tip on posting long text reports like EtreCheck's:

How to use the Add Text Feature When Post… - Apple Community

It is very possible that we can resolve this based on good data with only one more post on your part.

I tried the link you provide but here is what I get:

File not found!

Strange. I get the same. However the "Download Now" link still works. I just tested it.

EDIT:

It may be momentary—it started working again for me in about two minutes.

Try this link, then change the language if needed:

https://etrecheck.com/en/welcome.html

I am wondering if I should take my MacBook to apple store or it will die after loosing all the battery percentage even if it plugged in?

I would wait on taking it in until we see if there is a simple fix available. Etrecheck will show the battery cycle count.