The battery is no longer charging.
New lithium batteries must be discharged and charged for three to five cycles before they can be used effectively. Please try to fully discharge the battery to 20%, then turn off the computer and charge the battery for 12 hours. Turn on the computer again to use the battery power, and then discharge and charge again, so cycle 5 times, okay? (After turning on the computer, do not use the power cord to charge the battery, it can be charged only when it is turned off)