The rear hub motor is a 500 Watt high speed model from 9Continent Motors. It can keep the bike going at a constant speed of about 25 miles per hour.
Currently, I have the batteries mounted behind the seat on a metal mounting that clamps on to the seat post. The small bag directly under the seat houses the controller.
On the handlebars, I put a cycle analyst device from that allows me to track my exact speed, current draw, voltage, and how much capacity has been drained from the battery pack. I also have a very bright bike light for riding at night, and an e-brake lever that actives the regenerative braking feature on the controller.
The completed version 1.0 of the bike!
These are the 6s LiPo cells that I use for the bike. Connected in series, they give a nominal voltage of 44.4 Volts.
The charger I use is a Turnigy Double Tap charger. It can balance charge the batteries so that each cell has the same voltage. This prevents any one cell from being accidentally over charged or over discharged during normal use.
I took an old power supply out of a desktop to provide power to the charger. By combining all of the 12 Volt wires together, I am able to get 435 Watts of battery charging power.
A few hundred miles of riding later, I got sick of getting flats and bought some ebike rated tires. They feel super nice to ride on! I also decided to relocate the batteries to a center bag for enhanced aesthetics and so that I could also carry appropriate tools to repair the bike wherever I go.
Electric Bike (Personal)

In September 2014, I decided to build an electric bike that I could use to commute to campus on a daily basis. I bought a 500 watt hub motor kit, and a 2 22.2 volt 16 AH LiPo batteries to run it with. I installed the components on my Jamis TrailX bike. I am in the process of creating a custom battery box to be mounted in the middle of the bike.

Jeffrey Botticello
Mechanical Engineering Student Rochester, NY