I don't know anything about these battery powered bike but according to the internet there seems to be a strong following for Specialized Turbo Vado 6.0, it can travel up to 80 miles on a single charge which is more than any other bike I found; plus it can go up to 28 mph which is to fast for some states, not sure where you live but every country has a limit to the top speed of these sort of vehicles. Of course the Specialized cost about $5,000 not sure if there are options you can add on to it that would drive the price up.
If $5,000 is too much you can take a look at the Raleigh Redux IE Diamond Frame that cost $2,700, it got the highest reviews of the lower costing units. I think Raleigh lied about the performance saying it will go 28 mph and travel up to 80 miles on charge, problem with their quoted specs is that it runs on a motor that puts out 100 watts less than the Specialized, PLUS it has a smaller battery than the Specialized, so I have a feeling the Raleigh Specs are over exaggerated, but the price is good. Even if it only does 50 miles and speed being a non issue it would be great for limited income purposes like a college student.