20 Tons Electric Mold Transfer Cart Maintenance Free Battery Heavy Duty is a trackless electric flatbed cart consisting of power supply, transmission mechanism, steel bearing frame, steering system, travel mechanism, control module and troubleshooting module. Usually we choose battery, cable and motor as the power components of this series of transfer trolley. The power supply provides power for the traction motor through the electronic control module system to realize the start, stop, forward, backward and steering memory functions of the trackless electric flat trolley.