The 13.8-inch Surface Laptop 7 has separate battery, SSD and Surface Connect port guides. Storage and a worn battery are distinct service jobs.
What to check before buying
iFixit score
8/10 · Rubric v1.9. Source: Laptop repairability scores (iFixit). How to read the score.
Battery and storage
The SSD can be replaced or upgraded. Microsoft’s SSD removal guidance is linked from the procedure. The battery has a separate replacement guide. This page concerns the 13.8-inch model 2036.
Ports and other assemblies
The Surface Connect charging port, headphone jack, screen, speakers and trackpad each have a guide. The 15-inch Surface Laptop 7 uses separate instructions.