To prevent memory effects from occurring onto a secondary cell, when an electrical apparatus incorporating the secondary cell is charged.

A CPU 39 begins charging a secondary cell, when a secondary cell detecting switch 28 detects that the cell is set in its place and a DC adapter detecting switch 18a detects that the DC adapter is connected. When a touch tablet 6A or an operation key 7 is operated during the charging, a message is displayed on and LCD 6 stating that the operation is not possible during the charging. As the charging progresses and when a cell voltage detecting part 61 detects that the cell voltage has reached a given voltage, i.e., the charging has been completed, the CPU 39 displays the completion of the charging on the LCD 6 and resumes receiving inputs from the operation key 7 or the touch tablet 6A.