Electric bikes are just like traditional bicycles with a motor and controller added onto the bike. Most of these bikes include lithium batteries that can be charged up. Usually, the battery will last for about 15-25 miles, depending on the bike, although you can pedal the bike yourself if you lose the battery charge. Electric bikes usually only go up to 20mph and are designed for a maximum rider weight of 350 pounds. Seats on these bikes are fully adjustable for a comfortable ride. Certain models can even fold up for easy and compact storage.