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

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

To obtain an accurate quote, I recommend contacting multiple 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's also important to consider the battery's lifespan and any warranty offered by the manufacturer. Battery technologies are evolving rapidly, and prices may 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.