Batteries are ubiquitous. However, today’s batteries are expensive, range-limited, power-restricted, die too quickly, charge too slowly, and susceptible to safety issues. For this reason, model-based battery management systems (BMS) are of extreme interest. In this talk, we discuss eCAL’s open code for electrochemical-thermal battery models. Specifically, we also discuss applications of this code for (i) parameter identification, and (ii) optimal charging control. Finally, we close with exciting new perspectives for next-generation battery systems.