A method for reusing a vehicle rechargeable battery to rebuild an assembled battery from a plurality of battery units having a usage history is provided. The method includes measuring a remaining charge of each of a plurality of battery units (11) obtained by dismantling an assembled battery (10) having a usage history. The method further includes selecting from the battery units (11) a battery unit (11) in which the measured remaining charge is greater than or equal to a remaining charge lower limit value (Lm), which is set in a range that is greater than zero and less than a lower limit value of a remaining charge control range of a vehicle in which the assembled battery (10) was installed, and assembling a new assembled battery using the selected battery unit (11).
