Hi @bjoernisebaert
Go to ''Device Manager > Battery'' and uninstall the Microsoft ACPI Control Method battery drivers.
Once they have been uninstalled, close any open windows and then restart the laptop in the normal manner.
During the following startup, Windows will reinstall the battery drivers.
Doing this will forestall any problems with the OS possibly not recognizing the battery so that it will work correctly etc.
Fully charge the battery and then create a [link|https://www.windowscentral.com/generate-battery-report-windows-10|battery report] to view the status and condition of the battery.
Once you have the report, compare the ''Design Capacity'' value versus the ''Full Charge Capacity'' value as shown in the report. For a good new battery they should nearly be the same value.
If not you can work out the condition of the battery as a percentage, using the formula Full Charge Capacity value x 100 ÷ Design Capacity value.