Could be that you have a damaged charger for the laptop, and it isn't giving enough power to the laptop. That is a common and easy problem to solve. Also, have you tried restarting the computer? Sometimes, the software for handling the battery will glitch out, and a quick reboot will fix it. The other issue that comes to mind that it could be, is if there is a problem with the laptop itself in the circuits for the battery charger. Damaged jack, or blown capacitor, etc. If it is that, it isn't always easy to fix.
If it seems like it is something hardware related, wiggle the jack and the cord, and see if that changes things any.
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