ah, there is the issue..
I saw a mention of a small drive motor that could be fitted into the seat tube .
and drive the special crankset,, which has the other half of the 90 degree bevel drive.

But small probably means little torque , so a headwind assistance on flat lands maybe..

at a premium price ..
the wheel hub motor schemes are more common..
and miles of range is all about Battery Amp/hours.. and battery weight.