If you cite this website, please refer besides to the website (www.battery-charts.de) to this preprint:
Jan Figgener, Christopher Hecht, David Haberschusz, Jakob Bors, Kai Gerd Spreuer, Kai-Philipp Kairies, Peter Stenzel, Dirk Uwe Sauer, The development of battery storage systems in Germany: A market review (status 2023), 2023, DOI: 10.48550/arXiv.2203.06762
For presentations in short: Figgener et al., The development of battery storage systems in Germany: A market review (status 2023), 2023