Control apparatus of electricity accumulation mechanism

A hybrid ECU executes a program that includes the steps of: determining whether a deterioration degree of a battery is greater than a predetermined degree (S200); when the deterioration degree of the battery is greater than the predetermined value (YES at S200), tightening the regulation of charging/discharging power to/from the battery (S300); determining whether the deterioration degree of the battery is smaller than the predetermined value (S400) and; when the deterioration degree of the battery is smaller than the predetermined value (YES at S400), relaxing the regulation of charging/discharging power to/from the battery (S500).