Method and apparatus for power management in an electronic device

An electronic device comprising:

• a power supply;
• a supervisor circuit connected to said power supply for disabling all or a portion of functions of said electronic device if a first level of power from said power supply falls below a predefined threshold;
• a processor connected to said power supply and said supervisor circuit;
• said processor configured to receive a request via an input device for a function and a related function to be performed by said electronic device;
• an output device connected to said power supply, said processor, and said supervisor circuit, said output device configured to perform said function;
• said processor configured to measure a second level of power from said power supply and then perform a pre-function test;
• said pre-function test based on said function and selected to consume fewer power resources than said function and also selected to not cause said second level of power to fall below said predefined threshold;
• said processor further configured to measure a third level of power from said power supply as a consequence of performing said pre-function test;
• and,
• said processor further configured to, when a difference between said second level of power and said third level of power meets a predefined criterion, prevent said device from performing said function and determining whether other adjustments can be made to allow said electronic device to perform said related function;
• said processor further configured to, when said determination is affirmative, make at least one of said other adjustments and permit said electronic device to perform said related function.