Hello,Zenn Lsy
Thank you for posting in the Microsoft community.
The reason why your laptop can't be fully charged may be that you have turned on the smart charging mode, usually the switch to turn off this feature needs to be adjusted in the BIOS interface, the way to enter the BIOS interface depends on your laptop manufacturer's key settings, you can browse the brand's official website for the specific operation procedures, you can also consult the official technical support of the laptop brand to get further solutions to turn off the smart charging mode.
Good luck in resolving this issue as soon as possible!
Best Regards,
Rota Ye |Microsoft Community Support Specialist