I have recently buy a fonding ebike with standar bafang 250W rear hub, with batery inside frame (sanyo 36V 10.4Ah distributed in 40 cells 10x4 with a 10s4p config)
This is a chinnese, cheap and fine design with tipical low cost but nice accesories (freewheel shimano megarange 7 speeds 14-34T...