I watched the animation and I saw that the lander would land with a hard thud on the surface, with a system to collapse underneath and cushion it's fall. Why didn't they use the sky-crane method that NASA and JPL came up with?
If they had the mass budget to fit a crane they'd probably pack bigger batteries.
I'm not sure I understand. The Mars Rover is powered by a nuclear reactor.
The Schiaparelli lander is an experiment to test this specific landing method. The landing is the experiment. It's battery-powered and will go dark in a few days.