Patent ID: 8389137

Claim:
A method of reusing a rechargeable battery, the method comprising: collecting a plurality of used assembled batteries formed by a plurality of rechargeable batteries, each rechargeable battery holding initial individual information including at least a manufacturing date and an initial weight of the rechargeable battery; dismantling the plurality of collected used assembled batteries into the plurality of rechargeable batteries, each holding the individual information; calculating a weight decrease amount and usage period of each of the rechargeable batteries based on the initial individual information of the plurality of rechargeable batteries and individual information of the plurality of rechargeable batteries obtained after the dismantling; estimating a usage environmental temperature of a region in which each of the rechargeable batteries was used based on the calculated weight decrease amount and calculated usage period of each of the rechargeable batteries; classifying the plurality of rechargeable batteries of the dismantled assembled batteries into groups based on the estimated usage environmental temperature; and rebuilding a regenerated assembled battery reusing rechargeable batteries that have been classified into the same group.