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As I and the other commentor pointed out, quite a few bikes, especially the Netherlands, use the same standard engine and battery system by Bosch.

The one thing I never understood about the appeal of these bikes is the battery: it cannot be removed, so you cannot easily take the battery inside and charge it overnight like you can with all other bikes. This is a major inconvenience.

These bikes were actually made in Taiwan.

That’s not true, there are many manufacturers that use the same kind of battery and engine. In the Netherlands, most of the bikes I’ve seen seem to use Bosch.