9 Charging stations for battery-powered mechanical cleaning apparatus and window-cleaning robots and for battery-powered autonomous-driving cleaning robots, in particular for battery-powered autonomous-driving robotic vacuum cleaners and floor mopping robots, battery-powered autonomous-driving combined scrubbing and drying machines, battery-powered autonomous-driving sweeping machines, battery-powered autonomous-driving cleaning machines for hard surfaces and battery-powered autonomous-driving cleaning machines for carpets and carpeted floors