Hey there PanChris,
Thanks for reaching out to the Apple Support Communities. To get started, if you check the Battery Health on your MacBook with the steps shown below, do you see that the battery is functioning normally, or do you see a message that service would be recommended?
For more details, check out this link here: Get help with your Mac laptop battery - Apple Support
Check Battery Health
Choose Apple menu > System Preferences (or System Settings), then click Battery. The Battery information shown here includes Battery Health:
- Normal: The battery is functioning normally.
- Service Recommended: The battery's ability to hold charge is less than when it was new, or the battery isn't functioning normally. You can safely continue to use your Mac, but if your battery needs service or its lowered charging capacity is affecting your experience, get your battery evaluated at an Apple Store or Apple Authorized Service Provider, or contact Apple.
If the Battery Health shows that the battery is functioning normally, give the steps under the "Resolve battery-charging issues" section a try, and let us know the results.
We look forward to hearing back from you.
Cheers!