A secondary battery system comprising: a battery cabinet group comprising a plurality of battery cabinets each comprising a plurality of battery modules connected to each other, the battery module being a replacement unit; a power conditioning system connected to the battery cabinet group and is controlling charging and discharging of the battery cabinet group; and a battery controller connected to the PCS, wherein the battery controller comprises: a deterioration inspecting block obtaining a characteristic of each of the battery modules to inspect a deterioration status thereof; a numbering block numbering each of the battery modules in an order from a small deterioration to a large deterioration based on the characteristic obtained from the deterioration inspecting block; and a re-arrangement determining block determining a re-arrangement position of each of the battery modules in such way that numbers given by the numbering block are in sequence in the same battery cabinet, wherein: the numbering block performs numbering on each of the battery cabinets in an order from a lower resistance value to a higher resistance value along a wiring resistance value between the PCS and each of the battery cabinet; and the re-arrangement determining block determines the re-arrangement position of each of the battery modules in such a way that the ascending order of deterioration of the battery modules battery cabinet wise corresponds with the ascending order of resistance value of the battery cabinets. a battery cabinet group comprising a plurality of battery cabinets each comprising a plurality of battery modules connected to each other, the battery module being a replacement unit; a power conditioning system connected to the battery cabinet group and is controlling charging and discharging of the battery cabinet group; and a battery controller connected to the PCS, wherein the battery controller comprises: a deterioration inspecting block obtaining a characteristic of each of the battery modules to inspect a deterioration status thereof; a numbering block numbering each of the battery modules in an order from a small deterioration to a large deterioration based on the characteristic obtained from the deterioration inspecting block; and a re-arrangement determining block determining a re-arrangement position of each of the battery modules in such way that numbers given by the numbering block are in sequence in the same battery cabinet, wherein: the numbering block performs numbering on each of the battery cabinets in an order from a lower resistance value to a higher resistance value along a wiring resistance value between the PCS and each of the battery cabinet; and the re-arrangement determining block determines the re-arrangement position of each of the battery modules in such a way that the ascending order of deterioration of the battery modules battery cabinet wise corresponds with the ascending order of resistance value of the battery cabinets. a deterioration inspecting block obtaining a characteristic of each of the battery modules to inspect a deterioration status thereof; a numbering block numbering each of the battery modules in an order from a small deterioration to a large deterioration based on the characteristic obtained from the deterioration inspecting block; and a re-arrangement determining block determining a re-arrangement position of each of the battery modules in such way that numbers given by the numbering block are in sequence in the same battery cabinet, wherein: the numbering block performs numbering on each of the battery cabinets in an order from a lower resistance value to a higher resistance value along a wiring resistance value between the PCS and each of the battery cabinet; and the re-arrangement determining block determines the re-arrangement position of each of the battery modules in such a way that the ascending order of deterioration of the battery modules battery cabinet wise corresponds with the ascending order of resistance value of the battery cabinets. the numbering block performs numbering on each of the battery cabinets in an order from a lower resistance value to a higher resistance value along a wiring resistance value between the PCS and each of the battery cabinet; and the re-arrangement determining block determines the re-arrangement position of each of the battery modules in such a way that the ascending order of deterioration of the battery modules battery cabinet wise corresponds with the ascending order of resistance value of the battery cabinets.