The first test prototype of the second generation changed the body structure. It went to the sales team for trials, and their verdict was blunt: not enough of an improvement.
So the second prototype did not stop at the outside; it changed the inside: a larger brushless motor, with the magnets, bearings, control board, cells and gears all upgraded.
With this version the company also set a rule: motor ratings are never overstated. The picture shows a test prototype, its white body marked with lines against the design drawing.