Patent ID: 7795842

Claim:
A method for power management for a mobile electronic device, comprising: continually monitoring a voltage of a battery within a mobile electronic device, wherein the electronic device can operate in either a standalone mode powered by the battery, or in an externally powered mode, and wherein the battery is charged when the device is in external power mode; when the monitored voltage is below an upper turn-on threshold, UTOT, but is above a lower turn-on threshold, LTOT, then discriminating between standalone and external power modes, comprising: when the device is operating in standalone mode: automatically turning the device off; and enabling the device to be turned on in an emergency mode, wherein at least one emergency action is enabled and other device actions are disabled; and when the device is operating in external power mode: enabling the device to be turned on; and enabling all device actions when the device is turned on; and when the monitored voltage is below the lower turn-on threshold (LTOT) but is above a power-on reset threshold, POR, then further discriminating between standalone and external power modes, comprising: when the device is operating in standalone mode: automatically turning the device off; and preventing the device from being turned on; and when the device is operating in external power mode: enabling all device actions if the device is already turned on; and preventing the device from being turned on when the device is turned off.