Solved! laptop battery problem : fully charged when plugged but shut down when unplugged

Oct 9, 2018
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Before start, I'm using msi laptop GT62VR 6RD.

One day, my laptop battery started to show "fully charged" whenever charger plugged.
But as soon as I unplug the charger, laptop's battery LED turns to red and shut down immediately.

I think this problem comes from wrong battery indicator. What should I do?