Selecting a power path based on temperature

1. A method comprising:

measuring a temperature of a portable electronic device;

switching a power path for the portable electronic device from an external power source to an internal power pack based on the temperature of the portable electronic device, including switching to the internal power back when the temperature reaches a first threshold.

2. The method of claim 1 , wherein the switching further includes switching to the internal power pack when the temperature reaches a second threshold and when the portable electronic device is in a high heat operation mode.

3. The method of claim 1 , further comprising:

switching the power path back to the external power source when the temperature drops to a third threshold.

4. The method of claim 1 , further comprising:

switching the power path back to the external power source when the internal power pack reaches a low capacity threshold and when the temperature is below a fourth threshold.

5. The method of claim 1 , further comprising:

switching the power path back to the external power source when the internal power pack reaches a low capacity threshold and when the portable electronic device is in an emergency mode.

6. The method of claim 1 , wherein the internal power pack comprises a battery and wherein measuring the temperature includes measuring a temperature of the battery.

7. A portable electronic device comprising:

a temperature sensor configured to measure a temperature of the portable electronic device; and

a controller configured to switch a power path for the portable electronic device from an external power source to an internal power pack based on the temperature of the portable electronic device, including switching to the internal power pack when the temperature reaches a threshold.

8. The portable electronic device of claim 7 , wherein the controller is further configured to switch to the internal power pack when the temperature reaches a threshold and when the device is in a high heat operation mode.

9. The portable electronic device of claim 7 , wherein the controller is further configured to:

switch the power path back to the external power source when the temperature drops to a threshold.

10. The portable electronic device of claim 7 , wherein the controller is further configured to:

switch the power path back to the external power source when the internal power pack reaches a low capacity threshold and when the temperature is below a threshold.

11. The portable electronic device of claim 7 , wherein the controller is further configured to:

switch the power path back to the external power source when the internal power pack reaches a low capacity threshold and the portable electronic device is in an emergency mode.

12. The portable electronic device of claim 7 , wherein internal power pack comprises a battery and wherein the temperature sensor is configured to measure a temperature of the battery.

13. A method for heat management in a portable electronic device, the method comprising:

measuring a temperature of the portable electronic device; and

selecting whether the portable electronic device receives power from an external power source or an internal power pack as a function of the temperature of the portable electronic device, including selecting the internal power pack when the temperature is above a first threshold, wherein system components for the portable electronic device operate on a lower voltage when the portable electronic device receives power from the internal power pack than when the portable electronic device receives power from the external power source.

14. The method of claim 13 , wherein selecting further includes selecting the internal power pack when the temperature is above a second threshold and when the portable electronic device is in a high heat operation mode.

15. The method of claim 13 wherein selecting further includes selecting the external power source when the temperature is below a third threshold.

16. The method of claim 13 , wherein selecting further includes selecting the external power source when the internal power pack reaches a low capacity threshold and when the temperature is below a fourth threshold.

17. The method of claim 13 , wherein selecting further includes selecting the external power source when the internal power pack reaches a low capacity threshold and when the portable electronic device is in an emergency mode.

18. The method of claim 13 , wherein measuring the temperature includes measuring a temperature of the internal power pack.