The cost of a 10 kW battery can vary depending on several factors, such as the brand, model, technology, and functionalities of the battery. Additionally, installation costs and any additional components can also affect the total price.

Generally, the cost of a 10 kW battery ranges between €10,000 and €20,000 or even higher, depending on the specific features and supplier. It is important to note that this is only a rough estimate and the actual costs may vary.

To get an accurate quotation, I recommend contacting different suppliers and installers of battery systems. They can provide you with detailed quotes based on your specific needs and the desired specifications of the battery.

It is also important to consider the lifespan of the battery and any warranty offered by the manufacturer. Battery technologies are evolving rapidly and prices can change over time. It is wise to do thorough research and seek advice from experts before making a decision about purchasing a 10 kW battery.