Circuit, electronic apparatus, and control method

A control method for a power supply circuit which supplies, to a system, system power required for the system out of DC power supplied from a power supply, and charges a battery with charging power as remaining power, and

• when a cell voltage of the battery is a predetermined detection voltage or more and a charging current of the charging power becomes a predetermined detection current or less, the power supply circuit determines that a charged state of the battery is fully charged, wherein
• the power supply circuit estimates, as a second detection voltage, the cell voltage at a time when determining that the charged state is fully charged based on the cell voltage obtained in a specific charging state to the battery, and
• the power supply circuit updates the predetermined detection voltage from a predetermined first detection voltage to the second detection voltage.