| 摘要 |
PURPOSE: A detecting method is provided to detect the presently residual electricity quantity of any rechargeable battery at improved precision even when the rechargeable battery is a rechargeable battery whose performance is deteriorated. CONSTITUTION: A rechargeable battery is charged for 2.5 hours by a constant current-constant voltage charging method under condition of 4.2 V for the maximum charging voltage, where under condition of maintaining the temperature of the rechargeable battery at 25°C, the rechargeable battery is subjected to constant current charging at a charging current of 1A until the battery voltage reached 4.2 V, followed by subjecting to constant voltage charging. After this charging operation, the rechargeable battery is paused for a prescribed period of time, and thereafter, the rechargeable battery is subjected to discharging, where a discharging cycle of subjecting the rechargeable battery to discharging at a discharging current of 0.2 C (= 0.26 A) for 15 minutes.
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