Hi RSG-ZR2,
Thank you for reaching out Microsoft Community. We apologize for the inconvenience this has caused you.
I'd like you to run the battery report so we can further check whether the Surface device is already having a hardware battery problem. To run the battery report, simply type Command Prompt on the search box next to the Windows icon and run it as an administrator. Type and enter powercfg /batteryreport. Once done, kindly follow the file path, take a photo of the report and include it in your next post.
On the other hand, a one month grace period will only be given to devices that just got out of manufacturer's warranty and should not be beyond a month from the time it was expired but in your case, it would be best to **contact support**for further details about it.
Please respond to this thread for further assistance.
Kind Regards,
Crest_Z