Battery energy storage systems comprised of battery cells, battery modules, battery enclosures, DC and AC cables and conduit, switchgear, switches, fuses, inverters, transformers, battery management systems being recorded, downloadable software and hardware for battery management, power conversion systems being electric power converters, energy management systems in the nature of recorded, downloadable software and hardware for managing energy, mounting structures, metering being electric meters, electrical systems being electric resistors, capacitators, conductors and inductors, thermal management and active and passive cooling systems being cooling pads, temperature controllers, all-in-one (AIO) liquid coolers, internal cooling fans for the hardware in the battery energy storage system, and fire safety systems being ventilation panels, ventilation fans, smoke detectors, heat detectors, flame detectors, gas detectors for the battery enclosures and hardware in the energy storage system