| abstract |
(57) [Problem] To provide a battery deterioration judging device capable of objectively and accurately judging the degree of battery deterioration. The terminal voltage V of the battery when performing charging A charging current as a constant current detected by the voltage detecting means, the terminal voltage V from the first voltage V 1 to the second voltage V 2 The charging time tt up to the detection is detected by a timer, and the deterioration determining means determines the degree of battery deterioration from the charging time tt detected by the timer. |