PURPOSE: To conduct charging of a secondary battery by providing a charging current-setting means for setting a charging current supplied from an external power supply means to the secondary battery according to a current measured through a measuring means and a charging means for charging said secondary battery with the charging current set through this charging current-setting means.
CONSTITUTION: When the body part 2 of an electronic equipment is subjected to power-ON to be placed in use, an electric current to be consumed in the body part 2 is measured by a measuring part 3. Then, measured data of the measuring part are outputted to a microcomputer 8 via A/D converter 7. The microcomputer 8 sets a charging current corresponding to a consumed current measured from the corresponding relation between the consumed current and charging current stored in a set-point table 9. A charging part controls the charging current on the basis of a current value set by the microcomputer 8 in a setting part 6 to charge a secondary battery.