the new Avinox power system DJI have developed for their E-Bike looks pretty cool.
www.dji.com
Only issue is that in Australia, I could by a new Harley for the same price as the DJI ebike 
DJI Avinox Drive System - Powerful and Compact E-Bike Drive System - DJI
The DJI Avinox Drive System consists of a Drive Unit, battery, Control Display, and two Wireless Controllers. Its compact, lightweight, easy-to-install construction provides expanded freedom in frame design. The Drive Unit is small in size but delivers high torque, featuring multiple assist...
