https://www.galabau-messe.com/en/ausstellerprodukte/gala22/product-10314949/kress-20v-40v

Introducing: Kross Pack, our new 20 V battery. It has everything you expect from a smart battery. It is
extremely versatile and compatible with all tools from the Kress 20 V range – or you can use two together for the 40 V range we plan to launch at the end of April.
For maximum efficiency, the Kross Pack comes with the optimal power supply tailored to each tool.
A special shielding protects the battery cells from overheating and extreme external temperatures.
This guarantees a long service life.

https://www.kress.com/en/40v-platform/

For many generations, professional users have
placed their trust in the high quality, exceptional
durability and absolute reliability of Kress products.
With our Mission robotic mowers, Kress is successfully
continuing this tradition. That's because they
are developed, designed and manufactured to the
same quality standards that have made Kress an
iconic example of the "Made in Germany" hallmark.
Look forward to a great future with Kress!