A setting current switching circuit 120 includes a comparator 127. A battery temperature signal corresponding to a battery temperature detected by a battery temperature detecting unit 8 is inputted to one input terminal (−) of the comparator 127 and a reference signal corresponding to a reference temperature is inputted to the other input terminal (+) of the comparator 127 to vary the setting charging current value of a charging current setting unit 80 and the setting full-charge current value of a full-charge current setting unit 90 correspondingly to the output of the comparator 127.