As the share of fluctuating electricity producers (PV and wind power) increases, energy storage systems will have to take on more functions in the grid. Batteries play a key role here; from commercial and industrial storage systems to utility-scale storage for multiple uses, the requirements are rising. Key quality indicators are not only safety (including functional safety) but also reliability as well as performance, defined by efficiency and effectiveness, over an ideally long service life. Site-specific requirements, such as noise generation, are also important considerations. This session will examine these aspects from different perspectives, offering recommendations beyond existing standards based on operational experience.