A battery information estimation apparatus , comprising: a time detector configured to detect a time during which a voltage level of a second battery , being partially charged and discharged, changes through a constant current charge; and a state of health, SoH, information estimator configured to estimate SoH information of the second battery with the changed voltage level and the detected time, based on predetermined reference information; wherein the time detector comprises a voltage detector configured to detect the changed voltage level; and a time measurer configured to measure the time during which the voltage level changes; wherein the predetermined reference information comprises reference time information indicating information of a time during which the voltage level of a first battery, being fully charged and discharged through a constant current charge during cycles, changes based on predetermined voltage intervals; wherein the reference time information is classified for each cycle, in which full charging and discharging is performed, based on the cycles and the predetermined voltage intervals, and wherein the predetermined reference information comprises reference SoH information corresponding to the reference time information for each of the cycles; characterized in that the SoH information estimator is configured to detect, in the predetermined reference information, a voltage interval mapped to the changed voltage level of the second battery , from among the predetermined voltage intervals, extract a time mapped to the detected time, from among items of time information corresponding to the mapped voltage interval in the predetermined reference time information, and extract the SoH information of the second battery based on the mapped time and the reference SoH information. a time detector configured to detect a time during which a voltage level of a second battery , being partially charged and discharged, changes through a constant current charge; and a state of health, SoH, information estimator configured to estimate SoH information of the second battery with the changed voltage level and the detected time, based on predetermined reference information; wherein the time detector comprises a voltage detector configured to detect the changed voltage level; and a time measurer configured to measure the time during which the voltage level changes; wherein the predetermined reference information comprises reference time information indicating information of a time during which the voltage level of a first battery, being fully charged and discharged through a constant current charge during cycles, changes based on predetermined voltage intervals; wherein the reference time information is classified for each cycle, in which full charging and discharging is performed, based on the cycles and the predetermined voltage intervals, and wherein the predetermined reference information comprises reference SoH information corresponding to the reference time information for each of the cycles; characterized in that the SoH information estimator is configured to detect, in the predetermined reference information, a voltage interval mapped to the changed voltage level of the second battery , from among the predetermined voltage intervals, extract a time mapped to the detected time, from among items of time information corresponding to the mapped voltage interval in the predetermined reference time information, and extract the SoH information of the second battery based on the mapped time and the reference SoH information. <EOS>