The first functioning electric motor was displayed in the early 19th century, though the device constructed by British scientist Michael Faraday did little more than swirl a wire around a magnet when an electric charge was introduced. Still, the concept proved that electricity could do work. Functional electric motors would follow in many forms after that achievement in 1821. Soon scientists and tinkerers around the world, including visionaries such as Nikola Tesla, were experimenting with all manner of electric motors -- some worked with DC power, others with AC. By the end of the century, myriad electric motors had been produced, capable of exerting enough force with enough reliable control that they were practical for use in myriad applications.
It’s only available in one frame size but the low top tube, adjustable seat and more upright riding position make it comfortable for people of different heights. The low-ride cargo rack and smaller (20-inch) rear wheel lower the center of gravity making the bike easier to maneuver. This is a workhorse of a bike that could easily replace a second car for most day-to-day necessities.
As far as battery life goes, e-bikes get their juice from a rechargeable battery usually located on or integrated into the frame, and many are removable, so you can power up wherever it’s convenient. The length of your ride and how often you use the bike will determine how frequently you have to charge up. “An e-bike battery can last anywhere from 15 to 60 miles depending on the terrain, how much assist you select, and the rider’s weight, among other factors,” says Jonathan Weinert, North American sales and marketing manager for Bosch eBike Systems. “With a dual battery [like the one Bosch has], you can double that range [around 20 to 120 miles], so it’s very feasible to commute for a week without charging.”
For many bikes, battery range is more important that total power (because they're all pretty powerful). You want a bike that delivers a range long enough for your rides at the power levels you want. Most e-bikes will have three to five levels of assist kicking in anywhere from 25 percent of you pedal power to 200 percent boost. Consider how fast the battery takes to recharge, especially if you'll be using your bike for long commutes.