NOVELTY - The system has a discriminating unit for determining a discharged battery pack type of a vehicle using data received from a photographing device by a Bluetooth. A replacement section removes the discharged battery pack from the vehicle. A carrying part transports the discharged battery pack removed from the replacement section to a charging/discharging unit. The charging/discharging unit charges the discharged battery pack. The discriminating unit is fixed in a bottom side of the vehicle. A CCTV takes a picture of the vehicle. A read camera reads a vehicle model.    USE - Energy storage system combined system for replacing a battery pack of a vehicle. Uses include but are not limited to an electric vehicle (EV), a hybrid electric vehicle (HEV), a fuel cell electric vehicle (FCEV), a plug-in-hybrid electric vehicle (PHEV) and a car.    ADVANTAGE - The system charges multiple battery packs so as to replace the charged battery packs with the discharged battery pack in the vehicle, so that an operator converts a replacing mode, thus reducing accident generated during direct charging of the discharged battery pack and time to replace the discharged battery pack. The system separates the battery pack among the battery packs according to a buffer battery pack and classifies an energy storage system (ESS) exclusive battery when charging capacity of the buffer battery pack is decreased so as to prevent discard performance of the buffer battery pack. The system automatically replaces the discharged battery pack by the operator so as to improve convenience of the operator.    DESCRIPTION OF DRAWING(S) - The drawing shows a flow chart illustrating operation of a system for replacing a battery pack of a vehicle.'(Drawing includes non-English language text)'    Step for removing a discharged battery pack (S10)    Step for transporting the discharged battery pack to a charging/discharging unit (S11)    Step for charging a discharged battery pack (S12)    Step for checking a charged battery pack (S13)    Step for sorting a buffer battery pack (S14)