magnetic generator in the boot !!!!!

i have been wondering when the scooter runs out of charge.
if i managed to fit a magnetic motor wi the most powerfull magnets in button size glued on in the boot just have too give it a push the wheel in the boot it would start to spin faster and faster .
wondering what sort of power it would produce .? wonder if its enough to charge the vectrix.????
and probbley have to fit small invertor 2kw would it work
but a tiny one and mabe have small motor as a slave start on it.
you see them on youtube .let me no what you think .kev