From their FAQ on the product page:
Will there be accessories, like a spare battery and protective case?
Yes, there will be. We’ll make those available on due course the project.
I know it's not a complete answer to your question, but it seems, at least, that the battery will be replaceable.
From their FAQ on the product page:
Will there be accessories, like a spare battery and protective case?
I know it's not a complete answer to your question, but it seems, at least, that the battery will be replaceable.