The problem you run in to with any EV is at some point the weight of the batteries is more than the power it can generate to move that weight.
They call that the law of diminishing returns: "The law of Diminishing Returns states
that the result of adding a factor of production is a smaller increase in output. The addition of any amounts of a factor of production, after some best possible level of capacity utilization, will inevitably capitulate decreased per-unit incremental returns."
That is why EV manufacturers are trying to develop batteries that weigh less and motors that have less friction to get as much power as they can from an EV.
Another way to overcome that is to carry some form of power generation with the vehicle such as solar panels and they make very lightweight panels that can recharge an EV but it takes a lot of square footage to generate enough power to power an EV for any significant distance.
There are some solar gliders that have flown for 70 hours straight. Tesla holds the record for 315 miles continues driving and the longest ebike range to date is 367 miles on a Delfast.
More ebikes are getting in to the 80 mile range now which is about as long as anyone would probably want to ride a bike continually at speeds of 20 miles an hour on average.
With PAS the rider can provide a good portion of the power for much longer distances but the human body still has limits and requires food, water and rest. "Biker breaks
Guinness record on Trace. The record – for the longest continuous bike ride – had been
350 miles. As Dirk Homeier stopped abruptly after crossing the finish line, he bowed his head against the handle bars in prayer – some 31 hours, 46 minutes and 55 seconds after he began the trip."
The lighter the vehicle and less resistance the farther you can go but at some point diminishing returns happens and there are no perpetual motion machines possible says the laws of physics.