Charging device providing a stable display of the residual charge in a battery

摘要

A control section periodically measures a battery voltage with the battery voltage measuring section when the portable electronic apparatus is used in a normal operation mode, updating a measurement value stored in the storage section only when a measurement value at a current point of time is smaller than a previous measurement value stored in the storage section, and periodically measures a battery voltage with the battery voltage measuring section during charging, updating a measurement value stored in the storing section only when a measurement value at the current point of time is larger than a previous measurement value stored in the storage section, and displaying a residual charge in the battery according to the updated measurement value in the storage section.