Why is my Lenovo notebook 84% available? (The power supply is connected and not charged)

Um ... This is not wonderful. . On the one hand, it consumes electricity itself; On the other hand, after the battery is used for a period of time, the power will drop and it is difficult to fully charge it. . Or it will drop a little soon after it is full. . This is for reference only. Don't be so picky. .