However,if I unplugg it when the laptop is already running, then the laptop would not shut down and it will run normally.
But if I unplugg it while it's shut down and I turn it back on, the laptop will shut down after I unlock the laptop. It's Asus.
System Model: X411UN
Here's a video about how it shuts down unexpectedly: https://www.youtube.com/watch?v=CpSABSufpjA
Normally if I unplug it with the laptop on, my battery should last at least 2 hours. While in the video, it shows me that 41 minutes remaining, which is already abnormal. And it turned off within 1 minute. The battery also displays 0% immediately for unknown reason. And I didn't do anything other than unlock the laptop.