Why is my laptop not charging? The led indicater does not light up but the laptop thinks it plugged in

I have a Elitebook 820 G3 laptop.
As far as I could tell the battery held charge well until it suddenly stopped charging. When plugged in the led charging indicator does not light up. However the laptop reconizes its plugged in at the icon tray
The battery does not charge. What do i do to fix this?