Have now made very negative experience with this model for the second time. Cleaning performance is indeed ok, features simple but adequate (at least with timer), but the built-in battery is the last crap. When you first purchase I still thought that just simply a defect had occurred, as after a few months the battery is becoming weaker. But as I was otherwise satisfied, and the model is indeed very cheap, I bought the same toothbrush up again, but this time the battery performance was underwhelming from the start and worsened after a few weeks even further. Meanwhile, the battery lasts for just 3 to 4 times brushing, then it is again eternally long recharge. The battery of even cheaper brush my son (DM store brand) lasts forever compared.
Conclusion: Stay away from this model! Invest 20 euros more or choose another brand - - Dear 10 because then you have at least longer what it.