The cost of a 10 kWh battery can vary depending on several factors, such as the type of battery, quality, manufacturer, and any additional costs like installation and shipping fees. Additionally, market conditions and supply and demand can also affect prices.

As a guideline, you can expect that the cost of a 10 kWh battery ranges from a few thousand to several tens of thousands of euros. However, it's important to note that battery prices have significantly decreased over time and are expected to further decrease as technology continues to develop and the market grows.

It is advisable to contact battery suppliers or specialized companies in this field to obtain specific pricing information. They can provide you with quotes based on your specific needs and requirements. Additionally, it's important to consider the warranty, lifespan, and performance of the battery when making a purchasing decision, not just the initial cost.

It is wise to conduct a thorough cost analysis and compare quotes from different suppliers to gain a good understanding of the total costs and return on investment. Also, keep in mind that there may be subsidies, tax benefits, or other financial incentives available that can reduce costs.