We develop and analyze sustainable battery systems, in particular rechargeable aluminum-ion battery systems (AIB), a cost-effective and non-flammable electrical storage system. When using natural graphite as cathode material, we have demonstrated energy densities of 135 Wh/kg based on the active mass. As a high power storage, our AIB can be loaded and unloaded in less than 20 seconds. The process is reversible, and we have demonstrated more than 10.000 cycles with over 95 % charging efficiency in lab cells, with over 85 % energy efficiency. We manufacture single and multi-layer pouch cells with a capacity of up to 150 mAh, which achieve more than 2000 cycles at a charging rate of up to 10 C. The current performance of the AIB is already comparable to lead-acid batteries. This means that AIBs have great potential for stationary and hybrid mobile applications, e.g., for grid stabilization or an uninterruptible power supply.