However, the "speed" of the toothbrush falls after about 2 days but significantly. As I said, the battery lasts now though another week, but after 4 days the perceived "power" but is considerably weaker. This may be due to the batteries, that have the capacity, but not the power to operate the motor even after 4 days still like the first day. But it may also be due to the electronics, you do not know stop.
In any case, the construction of Oral-B is concerning. The batteries simply planned obsolescence and thus maximum crap. But this may not akkutauschen.de absolutely.