The internal rate of return method is adopted to measure the leasing price for batteries based on two principles， the users' electricity cost is as much as oil cost and the annual yield of the leasing company is as much as a 5-year loan interest rate. Taking electric buses as an example， under the condition of excluding and that of including the charging infrastructure investment cost， the battery leasing price and the funding gap are measured in three ways， that is， giving all subsidies to the leasing company， giving national subsidies to the leasing company and local subsidies to the users， giving all subsidies to the users. Under the condition of the oil cost remaining unchanged and that of rising by 30%， the curve of the ratio of change in leasing price for batteries and funding gap to the decline in battery prices is given. Finally a constructive scheme for battery leasing is presented based on analysis and comparison of the data.