Can you download this app [https://www.coconut-flavour.com/coconutbattery/|CoconutBattery] and take a snapshot of the main window so we can see as well [guide|21499] that would help in moving forward checking if the battery needs a swap out or if the charger system needs some attention. You might want to review this to make sure the basics are covered [https://support.apple.com/en-us/HT203207|Apple Portables: Troubleshooting MagSafe adapters].