It comes with a non-replaceable rechargeable battery. This can be charged one of three ways, by placing it in the pen dock on the signature type keyboard covers (pictured), if you have a Surface Studio, they also come with a built-in charging dock, and the third way being to buy the separate wireless charger.
Created in partnership with people with disabilities to support a variety of needs, the Microsoft Surface Adaptive Kit makes it easier to use and navigate devices through assistance from tactile, contrast, and mobility add-ons.