Question battery not charging

May 30, 2020
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I have a HP Omen laptop with 16gb ram and a gtx 1060 graphics card. For the past few days my laptop's battery is not charging and shows plugged in, but the charge is gradually decreasing. The laptop shuts down immediately if the power source is cut off(I have right now 70%). Also I have noticed a dramatic decrease in the gaming performance where the games are barely able to play at 20+ fps at lowest settings, whereas I used to get 90+ fps at high/ultra. please help