Charging device configured to reduce power consumption during non-charging period

A charging device comprising:

• a first connection portion to which a secondary battery is connectable;
• a charge controller configured to control selected one of a charging voltage and a charging current and apply the controlled charging voltage or the controlled charging current to the secondary battery through the first connection portion;
• a power supply circuit configured to supply the charge controller with power for driving the charge controller;
• and
• a second connection portion to which an external power supply is connectable,
• wherein supplying power from the power supply circuit to the charge controller is halted to place the charge controller in a power cutoff state during a period of time from a time when the external power supply is connected to the second connection portion to a time when the secondary battery is connected to the first connection portion and also during a period of time from a time when the secondary battery has become fully charged to a time when the secondary battery is disconnected from the first connection portion.