Topic Life getting near, the technology which presumes the life a little more than of this electric battery voltage value (v) and value of resistance (R) in the electric battery where remarkable change does not occur, is offered.Solutions When is formed the group electric battery which (10) charge state (SOC), until it is below the lower limit value of the specified usual use range which is used with control of charging and of the group electric battery, it discharges the group electric battery, dividing the plural electric batteries into plural electric battery blocks from the plural electric batteries in when discharging of the group electric battery, it measures the service capacity every of electric battery block, it calculates the capacity difference among the service capacities in plural electric battery blocking, it decides the life a little more than of electric battery block or the group electric battery on the basis of the capacity difference which was calculated. Selective figure Figure 2
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