Abstract: A system for managing power supply of a mobile device, includes a random access memory, a storage device, and a battery. The random access memory will not store information therein without power. The storage device can store information therein regardless of power supplied to the storage device. The storage device is connected to the random access memory. The storage device includes an image area. The battery is connected to the random access memory and the storage device. The mobile device is configured to work between a normal mode and a first power-saving mode. In the normal mode, the battery supplies power to the random access memory. In the first power-saving mode, information stored in the random access memory is copied into the image area, and the battery stops providing power to the random access memory.

Abstract: A power supply system includes an adapter adapted to covert AC power into DC power, a power supply chipset connected to the adapter, a main battery, a slave battery, and a control chipset connected to the power supply chipset, the main battery, and the slave battery. The power supply chipset is adapted to receive DC power provided by the adapter. The control chipset is configured to monitor whether the power supply chipset receives DC power. The power supply chipset can provide DC power to the electronic device system and charge the main battery and the slave battery when the power supply chipset receives DC power. The power supply chipset also can control the main battery and the slave battery providing power to the electronic device system when the power supply chipset does not receive DC power.

Abstract: An electronic device includes a storing module, an accelerometer, a first audio output module, and a control module. The storing module is configured to store a reference angle. The accelerometer is configured to sense acceleration of the electronic device along three axes X, Y, Z, wherein the X, Y, Z axes are all perpendicular to each other. The first audio output module is configured to output audio signals. The control module is configured to obtain an angle of rotation of the electronic device according to the values, and turn the first audio output module on after determining the angle is greater than the reference angle.