... Because among users and developers understand probably something fundamentally different! Why? Well, because this handheld vacuum cleaner does have a pretty good suction power, but the battery performance more than to be desired leaves much and that part is very noisy. And because there is no spare battery is available, which would mean a real relief of sucking. Namely, because after about 8 minutes, the part gives up the ghost, you go to the Dock-in-station, a good piece reinsteckt and again waiting 3.5 hours until it is recharged. With a second battery you would win so much time that you can suck certainly well over. There are so Dyson handheld vacuum cleaner with replaceable battery. Only this is not - and at this price! Sorry, but who has developed the thing has never been clean in his life in his household. Annoying, just annoying! The price-performance ratio does not here unfortunately. The 3 stars because the Dyson good is only otherwise in hand, what are suctioned away neatly and is easy to use. I also have mercifully given a star to do so because I am angry at my own stupidity, not to look precisely in advance and inform mmich! Maybe that helps this review other than those falling into the battery case!