The image forming apparatus includes a fixing device that has a heater, and a required power calculation unit that determines a power Pfsr that is assumed to be required by the heater. Based on a difference between a required power that is determined by the required power calculation unit and a suppliable power, the image forming apparatus selects whether to start printing in a normal mode or to start printing in a power saving mode in which the power that is supplied to the heater is reduced in comparison to the normal mode. The power saving mode includes a plurality of modes, and when a CPU selects the power saving mode, the CPU selects one or a combination of modes from among the plurality of power saving modes based on the aforementioned difference.

An information processing apparatus includes a processor configured to change a power saving setting of an apparatus to a third setting in which a power saving effect is higher than in a second setting based on a usage status of the apparatus in a case where the power saving setting of the apparatus is changed from a first setting to the second setting; in which the first setting is a default setting of the apparatus, and the second setting is different from the third setting.

An electronic device, which can charge a battery selected from a plurality of batteries and can drive the battery as a power feeding source, includes a control unit and a display unit. When a remaining power of a second battery that does not correspond to a first battery selected as a battery to be charged or the power feeding source among the plurality of batteries is higher than or equal to a predetermined threshold value, the control unit causes the display unit to display a remaining power of the first battery from among the remaining power of the first battery and the remaining power of the second battery, and when the remaining power of the second battery is lower than the threshold value, the control unit causes the display unit to display the remaining power of the first battery and the remaining power of the second battery.

A printer includes a power supply section, a first communication section configured to make wired communication with a first smart device having a battery and supply power from the power supply section to the first smart device, a printing section that performs printing, and a control section, and the control section acquires temperature information, acquires remaining amount information of the battery from the first smart device using the first communication section, dynamically changes a threshold value based on the acquired temperature information in a range less than the maximum value of the remaining amount information, executes a first mode in which power is supplied from the power supply section to the first smart device via the first communication section when the remaining amount information is less than the threshold value, and executes a second mode in which power is not supplied from the power supply section to the first smart device via the first communication section for a predetermined period when the remaining amount information is equal to or more than the threshold value.

A printer apparatus that operates with power supplied by a power supply device includes: a printing unit that performs printing; a communication unit that is connected by USB to an external apparatus and supplies the power to the external apparatus; and a print control unit that causes the printing unit to perform printing in accordance with a print command received by the communication unit. When the printing unit performs the printing, the print control unit causes the communication unit to transmit a power-saving-enabling instruction that instructs the external apparatus to enter a power saving state.

A printing apparatus includes a conveyance unit for conveying a print medium fed from a feeding apparatus, a detection unit for detecting the fed print medium, a printhead, provided downstream of the detection unit with respect to a conveyance direction of the print medium, for printing an image by discharging ink to the conveyed print medium, and a heating unit, provided downstream of the printhead with respect to the conveyance direction, for heating the print medium on which the image is printed. The printing apparatus exclusively controls to stop driving of the heating unit if it is determined, based on a timing of detecting the print medium, that the print medium is at a print position, and to drive the heating unit if it is determined that the print medium is not at the print position.

The image forming apparatus includes a fixing device that has a heater, and a required power calculation unit that determines a power Pfsr that is assumed to be required by the heater. Based on a difference between a required power that is determined by the required power calculation unit and a suppliable power, the image forming apparatus selects whether to start printing in a normal mode or to start printing in a power saving mode in which the power that is supplied to the heater is reduced in comparison to the normal mode. The power saving mode includes a plurality of modes, and when a CPU selects the power saving mode, the CPU selects one or a combination of modes from among the plurality of power saving modes based on the aforementioned difference.

In order to turn on power of an information processing apparatus at an appropriate timing. For this purpose, the information processing apparatus includes a manually power-on function of turning on the power in a case where a mechanical power supply switch is turned on and an automatically power-on function of turning on the power in a case where predetermined information is detected. In a case where the information processing apparatus is in a particular mode, the automatically power-on function is disabled.

An information processing apparatus includes a processor configured to stepwisely change a power saving setting of an apparatus based on a usage status of the apparatus.

A communication device may set an operation mode of the communication device to a first mode, the first mode being for repeatedly sending a polling signal to a specific server on the Internet so as to receive target data from the specific server. The communication device may receive a response including related information which is related to the target data from the specific server, and receive a response not including the related information from the specific server. The communication device may set the operation mode of the communication device to a second mode instead of the first mode in a case where a first predetermined condition is satisfied in a state where the operation mode of the communication device is the first mode, wherein the second mode is for receiving the target data from the specific server without sending the polling signal to the specific server.