This one was Made in Canada Electric hub system that has a 450 watt peak and runs on NiMH batt
http://www.bionx.ca/ are the people who make it and http://www.jvbike.com/eps_kit.htm is a place to get it.
250W Nominal 450W Peak
Weight: 7,7 lb / 3.5 kg
3.5 kg brushless and maintenance free motor as well as its 4,1 kg NiMH battery, this model will undoubtedly continue to win riders hearts for many years to come.
NiMH 24V 8AHr (192 WHr)
Weight: 9 lb / 4.1 kg