First, inspect the power adapter and ensure that it is firmly connected to both the laptop and the electrical outlet.

Next, inspect the power supply port on the laptop to ensure that it is free of any residues or blockages.

Third, clean the battery contacts with a soft cloth and then reset the battery.

Fourth, check your laptop's power settings to make sure there are no settings that will prevent your laptop from charging up to 100%.

Fifth, update your laptop’s software and ensure that the necessary drivers are installed for your laptop to ensure that your laptop can charge correctly.

Finally, if none of the aforementioned steps resolve the issue, it might be necessary to contact the laptop’s manufacturer for more assistance.