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A system and method for battery protection. In some aspects, a method of conducting an operation including a battery pack, includes the acts of monitoring a first battery pack condition at a first monitoring rate, determining when a second battery pack condition reaches a threshold, after the second

A system and method for battery protection. In some aspects, a method of conducting an operation including a battery pack, includes the acts of monitoring a first battery pack condition at a first monitoring rate, determining when a second battery pack condition reaches a threshold, after the second battery pack condition reaches the threshold, monitoring the first battery pack condition at a second monitoring rate, the second monitoring rate being different than the first monitoring rate. In some aspects, a method of conducting an operation including a battery, the battery including a cell having a voltage, power being transferable between the cell and the electrical device, a controller operable to control a function of the battery pack, the controller being operable with a voltage at least one of equal to and greater than an operating voltage threshold, the cell being operable to selectively supply voltage to the controller, includes the act of enabling the controller to operate when the voltage supplied by the cell is below the operating voltage threshold.

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We claim: 1. A battery pack configured to be interfaced with a power tool, the battery pack comprising: a housing; a cell having a voltage, power being transferable between the cell and the power tool; a controller operable to control a function of the battery pack, the controller being operable wi

We claim: 1. A battery pack configured to be interfaced with a power tool, the battery pack comprising: a housing; a cell having a voltage, power being transferable between the cell and the power tool; a controller operable to control a function of the battery pack, the controller being operable with a voltage at least one of equal to and greater than an operating voltage threshold, the cell being operable to selectively supply voltage to the controller; and a circuit operable to enable the controller to operate when the voltage supplied by the cell to the controller is below the operating voltage threshold of the controller, the circuit including a switch operable to selectively interrupt the transfer of power between the cell and the power tool while the power tool is being operated by a user, the switch including a FET. 2. The battery pack as set forth in claim 1 wherein the circuit is operable to supply voltage to the controller such that the voltage supplied to the controller is at least one of equal to and greater than an operating voltage threshold. 3. The battery pack as set forth in claim 2 wherein the circuit includes a boost circuit operable to boost the voltage supplied by the cell to at least one of equal to and greater than an operating voltage threshold. 4. The battery pack as set forth in claim 2 wherein the circuit includes a power source operable to supply voltage to the controller such that the voltage supplied to the controller is at least one of equal to and greater than an operating voltage threshold, the power source not being operable to supply power to the power tool. 5. The battery pack as set forth in claim 4 wherein the power source includes a power component operable to supply voltage to the controller such that the voltage supplied to the controller is at least one of equal to and greater than an operating voltage threshold. 6. The battery pack as set forth in claim 5 wherein the power component includes a capacitor operable to supply voltage to the controller such that the voltage supplied to the controller is at least one of equal to and greater than an operating voltage threshold. 7. The battery pack as set forth in claim 5 wherein the power component includes a battery cell operable to supply voltage to the controller such that the voltage supplied to the controller is at least one of equal to and greater than an operating voltage threshold. 8. The battery pack as set forth in claim 1 wherein the controller is operable to control the FET such that the voltage supplied by the cell to the controller is at least one of equal to and greater than an operating voltage threshold. 9. The battery pack as set forth in claim 1 wherein the cell is operable to supply power to the power tool to operate the power tool. 10. The battery pack as set forth in claim 9 wherein, when the cell is at a low temperature, the supply of power to the power tool causes the voltage supplied by the cell to the controller to be below the operating voltage threshold. 11. The battery pack as set forth in claim 10 wherein, when the cell is at a higher temperature, the supply of power to the power tool does not cause the voltage supplied by the cell to the controller to be below the operating voltage threshold. 12. The battery pack as set forth in claim 9 wherein, when an ambient temperature is a low temperature, the supply of power to the power tool causes the voltage supplied by the cell to the controller to be below the operating voltage threshold. 13. The battery pack as set forth in claim 12 wherein, when the ambient temperature is at a higher temperature, the supply of power to the power tool does not cause the voltage supplied by the cell to the controller to be below the operating voltage threshold. 14. The battery pack as set forth in claim 9 wherein a load on the power tool causes the voltage supplied by the cell to the controller to be below the operating voltage threshold. 15. The battery pack as set forth in claim 9 wherein the operating voltage threshold is about 5 volts. 16. The battery pack as set forth in claim 9 wherein the operating voltage threshold is about 3 volts. 17. The battery pack as set forth in claim 1 wherein the function includes interrupting the transfer of power between the cell and the power tool. 18. The battery pack as set forth in claim 17 wherein the cell is operable to supply power to the power tool to operate the power tool, and wherein the function includes interrupting the supply of power from the cell to the power tool. 19. A method of conducting an operation which includes operating a battery pack, the battery pack including a cell having a voltage, power being transferable between the cell and a power tool, a controller operable to control a function of the battery pack, the controller being operable with a voltage at least one of equal to and greater than an operating voltage threshold, the cell being operable to selectively supply voltage to the controller, and a circuit including a switch, the switch including a FET, said method comprising the act of enabling the controller to operate when the voltage supplied by the cell to the controller is below the operating voltage threshold of the controller, wherein the enabling act includes the act of controlling the FET such that the transfer of power between the cell and the power tool is selectively interrupted while the power tool is being operated by a user. 20. The method as set forth in claim 19 wherein the circuit is operable to supply voltage to the controller, and wherein the enabling act includes the act of, with the circuit, supplying a voltage to the controller such that the voltage supplied to the controller is at least one of equal to and greater than an operating voltage threshold. 21. The method as set forth in claim 20 wherein the circuit includes a boost circuit operable to boost the voltage supplied by the cell, and wherein the supplying act includes boosting the voltage supplied to the controller by the cell to at least one of equal to and greater than an operating voltage threshold. 22. The method as set forth in claim 20 wherein the circuit includes a power source operable to supply voltage to the controller, the power source not being operable to supply power to the power tool, and wherein the supplying act includes the act of supplying voltage from the power source to the controller such that the voltage supplied to the controller is at least one of equal to and greater than an operating voltage threshold. 23. The method as set forth in claim 22 wherein the power source includes a power component operable to supply voltage to the controller, and wherein the supplying act includes the act of supplying voltage from the power component to the controller such that the voltage supplied to the controller is at least one of equal to and greater than an operating voltage threshold. 24. The method as set forth in claim 23 wherein the power component includes a capacitor operable to supply voltage to the controller, and wherein the supplying act includes the act of supplying voltage from the capacitor to the controller such that the voltage supplied to the controller is at least one of equal to and greater than an operating voltage threshold. 25. The method as set forth in claim 23 wherein the power component includes a battery cell operable to supply voltage to the controller, and wherein the supplying act includes the act of supplying voltage from the battery cell to the controller such that the voltage supplied to the controller is at least one of equal to and greater than an operating voltage threshold. 26. The method as set forth in claim 19 wherein the enabling act further includes the act of controlling the FET such that the voltage supplied by the cell to the controller is at least one of equal to and greater than an operating voltage threshold. 27. The method as set forth in claim 19 and further comprising the act of supplying power from the cell to the power tool to operate the power tool. 28. The method as set forth in claim 19 and further comprising the act of, with the controller, interrupting the transfer of power between the cell and the power tool. 29. The method as set forth in claim 28 wherein the cell is operable to supply power to the power tool to operate the power tool, and wherein the interrupting act includes the act of interrupting the supply of power from the cell to the power tool.