Although there are a great many folding bike manufacturers out there, Brompton
The Brompton Electric features a 250-watt brushless DC front hub motor, which augments the rider's pedalling input up to a top speed of 15.5 mph (25 km/h).
It's powered by a 36V/8.55Ah removable battery pack, which can be carried in an included shoulder bag when the bike is being transported. Using the standard charger, that battery can be juiced up to 80 percent in 3 to 3.5 hours, and up to 100 percent in 4 to 5 hours.
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