My criticism is directed at the manufacturer. Brown installed NI MH batteries that hold only about 2 years with "family mode". Then the toothbrushes switch off after a short use. The batteries can not be replaced by the end user as a rule. This means that the consumer should buy a new handpiece. The incorporation of lithium-ion batteries would offer here for the customer a distinct advantage. Who does not want to throw away the handpieces, can be used as "electronic hobbyists" under youtube.de instructions, see the replacement of batteries, but with some effort (soldering) connected.
Out of responsibility for our environment, I hope that very good Produtke also be designed for a simple battery or battery change per se.
