Printing system capable of printing in any of multiple power modes and control method for printing apparatus

A control method for a printing apparatus that performs printing in any of a plurality of power modes including (i) a first power mode in which the printing apparatus is supplied with power supplied from a battery, and (ii) a second power mode in which the printing apparatus is supplied with power supplied from both the battery and an external power supply, the control method comprising:

• obtaining a remaining battery level of the battery;
• and
• in the first power mode, calculating a number of sheets that the printing apparatus can print, based on the remaining battery level, and in the second power mode, calculating the number of sheets that the printing apparatus can print, based on the remaining battery level and an amount of power supplied from the external power supply.

A control method for a printing apparatus that has, as power modes, (i) a first power mode in which the printing apparatus is supplied with power from a battery, (ii) a second power mode in which the printing apparatus is supplied with power supplied from both the battery and an external power supply, and (iii) a third power mode in which the printing apparatus is supplied with power supplied from the external power supply, and performs printing in any of the first power mode, the second power mode, and the third power mode, the control method comprising:

• controlling the printing apparatus to perform printing in the third power mode in a case where an amount of power supplied from the external power supply is equal to or greater than a predetermined value;
• and
• in a case where printing is performed in the third power mode, causing the display unit to indicate that the number of sheets that the printing apparatus can print is infinite.