Abstract: An example information processing system includes a main device, and an operation device attachable to the main device. The operation device includes a first control circuit, a first battery, and a first power supply circuit. The main device includes a second control circuit, a second battery, and a second power supply circuit. The second power supply circuit supplies power from the second battery to the operation device in response to satisfaction of a condition about the amount of remaining charge indicated by the remaining charge amount information transmitted from the operation device. When power is supplied from the main device to the operation device, the first power supply circuit supplies power supplied from the main device to the first control circuit, instead of power from the first battery.

Abstract: An example information processing system includes a main device, and an operation device attachable to the main device. The operation device includes a first control circuit, a first battery, and a first power supply circuit. The main device includes a second control circuit, a second battery, and a second power supply circuit. The second power supply circuit supplies power from the second battery to the operation device in response to satisfaction of a condition about the amount of remaining charge indicated by the remaining charge amount information transmitted from the operation device. When power is supplied from the main device to the operation device, the first power supply circuit supplies power supplied from the main device to the first control circuit, instead of power from the first battery.

Abstract: An example information processing system includes a main device, and an operation device attachable to the main device. The operation device includes a first control circuit, a first battery, and a first power supply circuit. The main device includes a second control circuit, a second battery, and a second power supply circuit. The second power supply circuit supplies power from the second battery to the operation device in response to satisfaction of a condition about the amount of remaining charge indicated by the remaining charge amount information transmitted from the operation device. When power is supplied from the main device to the operation device, the first power supply circuit supplies power supplied from the main device to the first control circuit, instead of power from the first battery.

Abstract: An example connected device includes a first battery for supplying electric power to a game controller, a first terminal electrically connected to the game controller, and a resistor connected to the first terminal. The game controller includes a controlled component, a second battery for supplying electric power to the controlled component, a second terminal electrically connected to the connected device, a voltage detecting circuit detecting a voltage value in accordance with a current which flows through the resistor when the first terminal and the second terminal are connected to each other, and a control circuit. The control circuit discriminates a device connected to the game controller based on the detected voltage value, and switches from the second battery to the first battery when the discriminated device is the connected device while electric power is supplied from the second battery to the controlled component.

Abstract: An example connected device includes a first battery for supplying electric power to a game controller, a first terminal electrically connected to the game controller, and a resistor connected to the first terminal. The game controller includes a controlled component, a second battery for supplying electric power to the controlled component, a second terminal electrically connected to the connected device, a voltage detecting circuit detecting a voltage value in accordance with a current which flows through the resistor when the first terminal and the second terminal are connected to each other, and a control circuit. The control circuit discriminates a device connected to the game controller based on the detected voltage value, and switches from the second battery to the first battery when the discriminated device is the connected device while electric power is supplied from the second battery to the controlled component.

Abstract: An example information processing system includes a main device, and an operation device attachable to the main device. The operation device includes a first control circuit, a first battery, and a first power supply circuit. The main device includes a second control circuit, a second battery, and a second power supply circuit. The second power supply circuit supplies power from the second battery to the operation device in response to satisfaction of a condition about the amount of remaining charge indicated by the remaining charge amount information transmitted from the operation device. When power is supplied from the main device to the operation device, the first power supply circuit supplies power supplied from the main device to the first control circuit, instead of power from the first battery.