http://www.urbanebykes.com/ - Electric bikes use an electric motor which helps in making the motor run. These bikes use rechargeable batteries that can help your bike travel for up to 20 miles. Nowadays, they are becoming quite popular which is why they are replacing the old bikes. https://www.slideshare.net/Electriccycle/battery-bikes-what-is-a-battery-bike-and-why-would-i-buy-one