Video display apparatus and external power-supply apparatus

1. A video display apparatus comprising:

a first battery configured to be charged while a commercially available power is connected;

a second battery connected as an external apparatus and configured to be charged together with the first battery while the commercially available power is connected; and

a power switching module configured to supply power from at least one of the first battery or second battery upon receipt of an instruction to stop connection with the commercially available power, the power switching module switching the power between the first battery and the second battery according to a remaining amount of each of the first battery and the second battery upon receipt of an instruction to stop connection with the commercially available power,

wherein the power switching module compares the remaining amount of the first battery and the remaining amount of the second battery and, when the remaining amount of the first battery is greater than a predetermined value, supplies power to the second battery until the remaining amount of the first battery reaches the predetermined value.

2. The display apparatus of claim 1 , wherein the second battery functions as a power source configured to operate the video display device itself.

3. A video display apparatus comprising:

a first battery configured to be charged while a commercially available power is connected;

a second battery connected as an external apparatus and configured to be charged together with the first battery while the commercially available power is connected; and

a power switching module configured to supply power from at least one of the first and second batteries upon receipt of an instruction to stop connection with the commercially available power, the power switching module switching the power between the first battery and the second battery according to a remaining amount of each of the first battery and the second battery upon receipt of an instruction to stop connection with the commercially available power,

wherein the power switching module compares the remaining amount of the first battery and the remaining amount of the second battery and, when the remaining amount of the first battery is less than both of a predetermined value and the remaining amount of the second battery, derives power from the second battery.

4. The display apparatus of claim 3 , wherein the second battery functions as a power source configured to operate the video display device itself.

5. A method of driving a video display apparatus, comprising:

including a first battery configured to be charged while a commercially available power is connected and a second battery connected as an external apparatus and configured to be charged together with the first battery while the commercially available power is connected; and

supplying power to a reception module configured to receive at least a video signal and an audio signal, a playback module configured to play back the video signal and the audio signal received by the reception module, a display module configured to display the video played back by the playback module, and a control module configured to control operation of at least the reception module, the playback module, and the display module, by switching power between the first battery and the second battery according to a remaining amount of each of the first battery and the second battery upon receipt of an instruction to stop connection with the commercially available power,

wherein the remaining amount of the first battery and the remaining amount of the second battery are compared, and when the remaining amount of the first battery is greater than a predetermined value, power is supplied to the second battery until the remaining amount of the first battery reaches the predetermined value.

6. A method of driving a video display apparatus comprising:

a first battery configured to be charged while a commercially available power is connected and a second battery connected as an external apparatus and configured to be charged together with the first battery while the commercially available power is connected; and

supplying power to a reception module configured to receive at least a video signal and an audio signal, a playback module configured to play back the video signal and the audio signal received by the reception module, a display module configured to display the video played back by the playback module, and a control module configured to control operation of at least the reception module, the playback module, and the display module, by switching power between the first battery and the second battery according to a remaining amount of each of the first battery and the second battery upon receipt of an instruction to stop connection with the commercially available power,

wherein the remaining amount of the first battery and the remaining amount of the second battery are compared, and when the remaining amount of the first battery is less than both of a predetermined value and the remaining amount of the second battery, power is switched from the second battery to the first battery.

7. A television receiver comprising:

a reception module configured to receive a video signal and an audio signal;

a playback module configured to play back the video signal and the audio signal received by the reception module;

a display module configured to display the video played back by the playback module;

a control module configured to control operation of at least the reception module, the playback module, and the display module;

an instruction input module configured to receive a control instruction to the control module;

a first battery configured to be charged while a commercially available power is connected;

a second battery connected as an external apparatus and configured to be charged together with the first battery while the commercially available power is connected; and

a power control module configured to supply power to each module from the first battery or the second battery by switching power between the first battery and the second battery according to a remaining amount of each of the first battery and the second battery upon receipt of an instruction to stop connection with the commercially available power,

wherein the power control module is configured to compare the remaining amount of the first battery and the remaining amount of the second battery and, when the remaining amount of the first battery is greater than a predetermined value, to supply power to the second battery until the remaining amount of the first battery reaches the predetermined value.

8. A television receiver, comprising:

a reception module configured to receive a video signal and an audio signal;

a playback module configured to play back the video signal and the audio signal received by the reception module;

a display module configured to display the video played back by the playback module;

a control module configured to control operation of at least the reception module, the playback module, and the display module;

an instruction input module configured to receive a control instruction to the control module;

a first battery configured to be charged while a commercially available power is connected;

a second battery connected as an external apparatus and configured to be charged together with the first battery while the commercially available power is connected; and

a power control module configured to supply power to each module from the first battery or the second battery by switching power between the first battery and the second battery according to a remaining amount of each of the first battery and the second battery upon receipt of an instruction to stop connection with the commercially available power,

wherein the power control module is configured to compare the remaining amount of the first battery and the remaining amount of the second battery and, when the remaining amount of the first battery is less than both of a predetermined value and the remaining amount of the second battery, to derive power from the second battery.