I had this problem. I was using my system on a ups. It happens sometime th battery face problem due to wrong charging. People are simply over charging their device for long time. So here it is essential that you must take care about charging. To fix that a simple calibration will work. For that just keep the laptop aside until the entire battery is discharged and the charge it back again. If that helps it will help or else you will have to replace the adapter or even change the battery.
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