$100 onco BionX 36V electric bike conversion system. Batteries are dead, need replacing see https://ebikebc.com/bionx-battery-repair-refurbish/ or these can be rebuilt see for example https://syonyk.blogspot.com/p/bionx-battery-pack-rebuilds.html , he will also do a rebuild of the battery for less than USD500. Includes motor/hub, controller, battery rack and battery charger. New systems start around $2000.