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The natural follow up would be: How often do I have to plug it in? If I have to charge it daily it is probably too much of a hassle and I'll have to have it plugged-in all the time.

Once per day, 9h battery life. From the blog post.

https://busy.bar/blog/developing-the-mechanical-and-electric...

On the image which shows the back screen, you can also see a battery icon in the lower right, so that's a very safe bet.

Standard these days is chargeable, have to imagine that is the case here.