Ionly used 750 wh at most and I included the whole drive sysyem and motor and battery mounts that add up to 7 lbs including the motor. I have used a 20 oz motor with a 10 to 1 reduction gearbox that weighed 1 pound that was 90% efficient with the gearbox but decided it was too expensive and a motor with just a chain drive with less parts would be quieter and last for over 50,000 miles of ebiking without any maintenance.
Tell us more of what you know nothing about and roll your eyes more. lol