Can VanMoof e-bikes also be used as normal bicycles?

…or are they such that they only work when the battery is charged? https://www.vanmoof.com/de-DE/ebikes Because they look pretty electronically tuned 😋 The support page only states that when the battery is below 3%, everything deactivates and switches to second gear until it's recharged. So does that mean you can't even switch gears when the battery…