MOTOR-DRIVEN CONSTRUCTION MACHINE

PROBLEM TO BE SOLVED: To grasp a battery deterioration situation during long-time disuse.SOLUTION: A motor-driven construction machine comprises: a first determination section 22a for determining whether a single cell voltage detected by a single cell voltage detection device 21 which detects a single cell voltage of a battery 20, exceeds a preset single cell voltage threshold; a second determination section which includes a number count part 22b for counting the number of single cells exceeding the single cell voltage threshold; a number storage part 22c for storing the last number and the present number counted by the number count part 22b, a subtraction part 22i for calculating a number difference between the present number and the last number, and a number difference comparison part 22d for comparing the number difference calculated by the subtraction part 22i with a preset number difference threshold, and in which deterioration of each of batteries 20 is determined by the number difference comparison part 22d when the number difference is greater than the number difference threshold; and an output section 22e for outputting a deterioration signal when the deterioration of each of the batteries 20 is determined.