The robot promises more than it delivers.

The battery is charged separately, then inserted and then works completely wirelessly. Good experience made.

It works ONLY without a power cord/battery.

Yes, it runs on battery power.

Yes Battery and battery lasts well

Yes is operated with a rechargeable battery. The battery needs to be recharged quite often. In any case, the robot is not that "intelligent". It practically always cleans only a part of the window and says that it is finished.

Yes, we use the robot exclusively in battery mode - we easily achieve the specified runtime - for our application (which is very many, large windows) it is very suitable!