BATTERY DIAGNOSIS APPARATUS AND OPERATING METHOD THEREOF

A battery diagnosis apparatus according to an embodiment disclosed herein includes a communication circuit configured to obtain a cumulative mileage of a diagnosis target vehicle and a cumulative discharging energy of a battery mounted on the diagnosis target vehicle and obtain reference energy efficiencies of a plurality of vehicles of a same model as the diagnosis target vehicle, a first processor configured to calculate a threshold value, which is a criterion for replacement of a battery, based on the reference energy efficiencies, and a second processor configured to calculate a cumulative energy efficiency based on the cumulative mileage and the cumulative discharging energy and diagnose whether the battery has been replaced, based on the cumulative energy efficiency and the threshold value.