If you do not have an electric brush - run to the store for any, any manufacturer! ) Ni-Mh battery, there is a "memory effect", you need to regularly discharge it "to zero" and charge it completely. Ideally, it should always be used in this mode. But you should not reach fanaticism either, you just need to know about it. In my copy, there was no sound signal from the very beginning, I did not return it, it copes perfectly with its main functionality.
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