I have three e-bikes at present in my possession, and here's how they weigh in....
First:
Sarah's 250w GM mini motor. Bike = Giant Talon. 13" frame, 26" wheel. Battery Pack 54v 10ah lithium(2.7kg)
Fully loaded weight = 20.4KG
Second: 250w x2 Dual GM mini motors. Bike =Dawes 18" frame, 26" wheel. Battery Pack 54v 20ah lithium(5.3kg)
Fully loaded weight = 26.4KG
Third: x2 GM Magic Pies Dual drive. Bike= Specialized Stump Jumper 2004. 18" frame, 26" wheel.
Weight with rear rack and panieer bags without battery = 31.8KG
with x2 54v/20ah packs, fully loaded weight without rider = 42.4KG