CHARGER

PROBLEM TO BE SOLVED: To perform the proper charge of heterogeneous batteries by deciding the suitable charge current and the suitable charge time form the value obtained by detecting the maximum supply current of the current supply source connected, and the preset property data of a secondary battery to be charged. SOLUTION: When the output of a power supply adaptor 1 is connected to a variable charge current control circuit 2 and a maximum supply current detecting circuit 3, this detects the maximum supply current, and this converts it into voltage and transmits it to a charge current selecting circuit 4. The charge current selecting circuit 4 converts the output of a power adaptor 1 into the data to be set in the suitable charge current, and transmits it to a variable charge current control circuit 2 through a data line 8, and outputs a fixed suitable charge current geared to the data. On the other hand, a charge timer circuit 5 sets the suitable charge time with the data from the charge current selecting circuit 4 and the setting circuit 7, and turns on and turns off a charge current switch circuit 6. Hereby, the charge without excess or shortage is performed.