Abstract: A spring is combined between the chassis and the pair of links arms. An electric actuator is combined between the chassis and the pair of links arms for compressing the spring with the assistance of gravity on a downward stroke of the electric actuator while lowering the pair of link arms, and wherein the pair of link arms are raised by an outward stroke of both the electric actuator and the spring.

Abstract: A robotic vehicle comprising a chassis, a right track assembly and a left track assembly for supporting the chassis, and a battery unit comprising a front portion and a back portion with a center of gravity at the front portion. The battery unit is configured for connection to the chassis with the center of gravity forward of the chassis.

Abstract: A robotic vehicle with modular track assemblies that are separable from the chassis with the drive unit being self-contained in each track assembly with the motor controller, and the coolant system being enclosed in an ornamental cover all of which is positioned above the track and with a cooler of the coolant system being positioned rearward of the motor and the motor controller and a gear box connected outside the ornamental cover on the inside of the left track assembly to couple the motor to a final drive that drives the track with the motor being positioned above the final drive.