Hi kgozi ,
Look these recommendations:
PC is charging slowly or discharging while it’s plugged in - https://answers.microsoft.com/en-us/surface/for...
Surface battery won’t charge or Surface won’t run on battery - https://support.microsoft.com/en-us/help/402353....
As well we can try to see if this is due to a driver update issue. In order to resolve and keep your drivers update, please run the Surface Diagnostic Toolkit - https://support.microsoft.com/en-au/help/403723...
If any issues would be detected, you may need to uninstall and reinstall the battery driver.
Let me know if you have any questions