Hi Mykola,
Welcome to Microsoft Community.
I'm Hahn and I'm here to help you with your concern.
I'm sorry to hear about the battery throttling issue you're experiencing with your Surface Laptop Studio 2. This is a known issue, and we appreciate your feedback and are actively investigating it. We apologize for the inconvenience.
I recommend that you stay updated with Windows and Surface firmware and drivers, and I’ll keep you updated once there is any progress or resolution to this issue.
Your Sincerely
Hahn. W - MSFT | Microsoft Community Support Specialist