This disclosure describes techniques for the selection of suitable power-saving states when a device is placed in idle mode for an extended period of time. The device is placed in a low power state based on a comparison of the state of charge of the device battery with autonomously determined thresholds. The thresholds are determined based on battery discharge rates for various power-saving states. A remaining battery capacity at a time of entry into cutoff state or hibernation state and at a time of wake-up from the respective state is sampled by an embedded controller (EC) and stored in non-volatile (NV) memory. At a time of entry into a low power state, the time of entry is recorded by the application processor and/or the EC. Upon a time of wake-up from the low power state, a device real time clock (RTC) is synchronized with a network time in order to record a time of wake-up and determine an elapsed time.
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Nojiri, Daisuke, "Low Power Device Configuration Based On Battery Discharge Measurement", Technical Disclosure Commons, (October 01, 2020)