Hello Sarah Rossignol,
Thanks for reaching out to Microsoft Community.
We totally understand how you wanted to replace the battery on your device.
Unfortunately, there are no available replacement batteries that are sold separately for Surface devices. This means that the device needs to be replaced entirely. With that being said, it would be best to get in touch with the Microsoft assisted support to check for further options in replacing your device.
Please contact the live support through Contact Us - Microsoft Support. In any event the link won’t go through, try it on another browser or In-private browser.
We appreciate your understanding and cooperation.
Regards,
StevenK
The most evil thing is to not allow to replace the battery.
And then you can see how Bill Gates wants to save the planet but microsoft destroys Nature by trgovini away perfectly good tablets.