A virtual image display system, including a handheld electronic device having a first battery and a virtual image display having a second battery, is provided. The handheld electronic device and the virtual image display are coupled to each other. The handheld electronic device is used to calculate a power supply time of the first battery; calculate an expected discharge time of the second battery under a discharge condition; compare the power supply time and the expected discharge time to generate a comparison result; and adjust a supply current provided by the first battery to the virtual image display according to the comparison result.

There are provided a sensor data collection device, a sensor data collection system, and a method of collecting sensor data capable of reducing a drain of a battery due to standby power. The sensor data collection device includes a power supply, a power supply control circuit configured to control the power supply, a sensor configured to perform sensing to thereby obtain data, a memory configured to store the data obtained by the sensor, and a control circuit configured to control the power supply control circuit, the sensor, and the memory. The power supply control circuit supplies the sensor, the memory, and the control circuit with electrical power supplied by the power supply, and the control circuit makes the transition to any one of a plurality of operating states, and makes the power supply control circuit shut off the electrical power supplied by the power supply after a first operating state is completed and before the transition to a second operating state is made wherein the first operating state and the second operating state are included in the plurality of operating states.

An application processor includes a main central processing device that operates based on an external main clock signal received from at least one external clock source when the application processor is in an active mode, at least one internal clock source that generates an internal clock signal, and a sensor sub-system that processes sensing-data received from at least one sensor module on a predetermined cycle when the application processor is in the active mode or a sleep mode, and that operates based on the internal clock signal or an external sub clock signal received from the external clock source depending on an operating speed required for processing the sensing-data.

An application processor includes a main central processing device that operates based on an external main clock signal received from at least one external clock source when the application processor is in an active mode, at least one internal clock source that generates an internal clock signal, and a sensor sub-system that processes sensing-data received from at least one sensor module on a predetermined cycle when the application processor is in the active mode or a sleep mode, and that operates based on the internal clock signal or an external sub clock signal received from the external clock source depending on an operating speed required for processing the sensing-data.

Power conservation for devices is facilitated based on likelihood of power usage level. An example method can comprise determining, by a first device comprising a processor, that a second device is within a defined proximity of a third device, wherein the third device is determined to be operating in a mode according to a first power consumption operation that satisfies a defined condition, and wherein the operating in the mode according to the first power consumption operation is based on the third device being located at a defined location. The method can also comprise facilitating, by the first device, modification of the mode of the third device based on a determination of a likelihood of usage of a second power consumption operation by the third device. In various embodiments, the third device is configured to operate according to the power save mode or the extended discontinuous reception mode.

Power conservation for devices is facilitated based on likelihood of power usage level. An example method can comprise determining, by a first device comprising a processor, that a second device is within a defined proximity of a third device, wherein the third device is determined to be operating in a mode according to a first power consumption operation that satisfies a defined condition, and wherein the operating in the mode according to the first power consumption operation is based on the third device being located at a defined location. The method can also comprise facilitating, by the first device, modification of the mode of the third device based on a determination of a likelihood of usage of a second power consumption operation by the third device. In various embodiments, the third device is configured to operate according to the power save mode or the extended discontinuous reception mode.

A point-of-sale (POS) device includes a processor, a battery, a transaction object reader, a printer with a printer controller, and optionally a temperature sensor. The processor determines a present power discharge capability rate of the battery, optionally based on a temperature measured by the temperature sensor. The processor also calculates a first estimated power draw rate based on a first setting value for at least one of the components of the POS device, such as the printer. If the first estimated power draw rate is dangerously close to the present power discharge capability rate of the battery, a second estimated power draw rate is calculated based on a second setting value for the one or more components. If the second estimated power draw rate is no longer dangerously close to the present power discharge capability rate of the battery, the components are set to the second settings value.

A point-of-sale (POS) device includes a processor, a battery, a transaction object reader, a printer with a printer controller, and optionally a temperature sensor. The processor determines a present power discharge capability rate of the battery, optionally based on a temperature measured by the temperature sensor. The processor also calculates a first estimated power draw rate based on a first setting value for at least one of the components of the POS device, such as the printer. If the first estimated power draw rate is dangerously close to the present power discharge capability rate of the battery, a second estimated power draw rate is calculated based on a second setting value for the one or more components. If the second estimated power draw rate is no longer dangerously close to the present power discharge capability rate of the battery, the components are set to the second settings value.

Embodiments of the present invention provide a method for powering an electronic device with a battery or other backup power supply when an external power source is removed from the electronic device. The method determines if the ambient temperature of an electronic device is below a threshold and if the ambient temperature is below the threshold adjusting a minimum state of charge of the battery to prolong the life of the battery.

Embodiments of the present invention provide a method for powering an electronic device with a battery or other backup power supply when an external power source is removed from the electronic device. The method determines if the ambient temperature of an electronic device is below a threshold and if the ambient temperature is below the threshold adjusting a minimum state of charge of the battery to prolong the life of the battery.