The battery for smartphones is one of the most important energy sources these days. Nearly every one of us has a smartphone and most of us use it not only privately but also professionally. The latest developments and ever-increasing demands make sure that the small everyday helpers need more and more energy. However, smartphones are also expected to become slimmer and lighter. Battery manufacturers must therefore strike a balance between extreme performance and enormous lack of space. The latest technologies on the battery market ensure that in the future the development of capacities and services will also increase and thus pave the way for further developments on the mobile phone market. A look at the temporal interest in the search term “smartphone battery” in Google’s search engine clearly shows how demand has risen and will continue to rise in recent years.