Method and system for ensuring a residual battery capacity reaching a predetermined value before transitioning apparatus to power-saving mode

A control method for an electronic apparatus that is operatable in a normal mode and a first power saving mode with less power consumption than the normal mode, and that has a battery, the control method comprising:

• supplying electric power from the battery to a part of the electronic apparatus in the first power saving mode;
• charging the battery in the normal mode;
• controlling, in a case that a battery residual amount of the battery is smaller than a first threshold when transition from the normal mode to the first power saving mode is made, so as to charge the battery before the transition of the mode from the normal mode to the first power saving mode, and then make a transition from the normal mode to the first power saving mode in accordance with the battery residual amount becoming the first threshold, and
• controlling, in a case that the battery residual amount is larger than the first threshold when the mode of the electronic apparatus transitions from the normal mode to the first power saving mode, to transition the mode from the normal mode to the first power saving mode.

A non-transitory computer-readable storage medium storing a control program causing a computer to execute a control method for an electronic apparatus that is operatable in a normal mode and a first power saving mode with less power consumption than the normal mode, and that has a battery, the control method comprising:

• supplying electric power from the battery to a part of the electronic apparatus in the first power saving mode;
• charging the battery in the normal mode;
• controlling, in a case that a battery residual amount of the battery is smaller than a first threshold when transition from the normal mode to the first power saving mode is made, so as to charge the battery before the transition of the mode from the normal mode to the first power saving mode, and then make a transition from the normal mode to the first power saving mode in accordance with the battery residual amount becoming the first threshold, and
• controlling, in a case that the battery residual amount is larger than the first threshold when the mode of the electronic apparatus transitions from the normal mode to the first power saving mode, to transition the mode from the normal mode to the first power saving mode.