!!! After about 10 seconds the fan began to smoke and you could see a glowing component !!!
It was fortunate that I had said battery compartment is not screwed down again, otherwise I would not find out the batteries so quickly and the part would have melted on my table.
Such a defect can easily occur times, the vulture knows why. Sad, actually made the fan a very stable impression. The dealer assured me definitely it is the only known case.