One bad thing is the short duration of rechargeable batteries.
It will not be a problem if we could find spare batteries because the device is demonstrated very easily (4 screws and you have access to batteries). But even on the Internet, they are not found. There is a site that makes the USA, but he did not book in France. The SAV Karcher is, in the matter of spare parts to be ordered through the web, absolutely pathetic.
I found in France, spare batteries, but at a higher price in the new device!
So when the batteries are exhausted, ie after about 2 years, discard the device in full ... while still mechanically and visually flawless!
I do not congratulate Karcher for the few cases that this company, yet German and therefore usually more sensitive ecology, made the environment in this case.