When rolling down a 1/2 mile steep hill, I've managed to get my $250 hybrid bike up to 39MPH. Can't QUITE break 40, but 39 is with the whole frame shuddering and wobbling in a pretty frakkin scary way anyway, so I've never dared push it any further. I'm also carrying about 20 pounds of gear (change of clothes, computer, etc). A "real" $1200 unladen road bike would probably bust 45 fairly easily down the same hill, if you could find a cyclist stupid enough to try it.
If he spent an extra $100 on shoes, he might make 46, possibly even 47 if he dropped an extra $500 shoes made of mousefartium or whatever ultralight material is in vogue right now. (I use jogging sneakers and pedal baskets).
So, "max speed" of my bike (if I were selling it as a concept car) would be "around 50MPH", and the road bike would be "around 55MPH".
Your apparent accuracy obviously shows that your marketing skills need work.
Given that, this device probably really maxes out at about 2MPH, and that's for a Japanese citizen. Not known for excessive height. Put my 6'+ American frame on that bad boy, he's gonna have a more little trouble staying upright. :)
Now, overall, I like this idea if it could get up to about 10MPH, especially with as small as it folds. "But, wait," I hear you saying, "there are folding bicycles, too, and they have larger wheels and no need for a recharge! And they'll probably be 1/10 the cost of this thing!"
Oh, yeah, you're right. Never mind.