What is claimed is:

1 . A power tool comprising: an electric motor; an energy storage device (a) that includes hybrid supercapacitors and (b) that has an energy density of at least approximately 150 watt hours per kilogram (Wh/kg); and at least one switch configured to selectively enable power flow from the energy storage device to the electric motor and to selectively disable power flow from the energy storage device to the electric motor.

2. The power tool of claim 1 wherein the hybrid supercapacitors are electrically connected in series.

3. The power tool of claim 1 wherein the hybrid supercapacitors are electrically connected in parallel.

4. The power tool of claim 1 wherein the hybrid supercapacitors include (a) hybrid supercapacitors that are electrically connected in series and (b) hybrid supercapacitors that are electrically connected in parallel.

5. The power tool of claim 1 further comprising a control module configured to open and close the at least one switch, thereby controlling power flow from the energy storage device to the electric motor.

6. The power tool of claim 5 further comprising an input device, wherein the control module is configured to control switching of the switches based on input from the input device.

7. The power tool of claim 1 wherein the energy storage device is integrated into the power tool and not removable from the power tool.

8. The power tool of claim 1 wherein the energy storage device is removable from the power tool.

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SUBSTITUTE SHEET (RULE 26)

9. The power tool of claim 1 wherein the hybrid supercapacitors store power electrostatically.

10. The power tool of claim 1 wherein electrodes of the hybrid supercapacitors include graphene.

11. The power tool of claim 1 wherein electrodes of the hybrid supercapacitors include a nanocarbon material.

12. The power tool of claim 1 wherein the energy storage device has a nominal output voltage of at least 24 volts direct current (DC).

13. The power tool of claim 1 wherein the energy storage device has a power density of at least approximately 1000 W/kg.

14. The power tool of claim 1 wherein the hybrid supercapacitors are each cylindrical.

15. The power tool of claim 14 wherein the hybrid supercapacitors each include two terminals extending outwardly from a circular face of the cylindrical hybrid supercapacitors.

16. The power tool of claim 1 further comprising a circuit board, wherein the hybrid supercapacitors are soldered on the circuit board.

17. A power tool comprising: an electric motor; an energy storage device that includes hybrid supercapacitors, wherein the hybrid supercapacitors have an energy density of at least approximately 150 watt hours per kilogram (Wh/kg) and each of the hybrid super capacitors includes: a first electrode that includes a nanocarbon material; and a second electrode that includes lithium; and at least one switch configured to selectively enable power flow from the energy storage device to the electric motor and to selectively disable power flow from the energy storage device to the electric motor.

18. The power tool of claim 17 wherein the hybrid supercapacitors are electrically connected in series.

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SUBSTITUTE SHEET (RULE 26)

19. The power tool of claim 17 wherein the hybrid supercapacitors are electrically connected in parallel.

20. The power tool of claim 17 wherein the hybrid supercapacitors include (a) hybrid supercapacitors that are electrically connected in series and (b) hybrid supercapacitors that are electrically connected in parallel.

21. The power tool of claim 17 further comprising a control module configured to open and close the at least one switch, thereby controlling power flow from the energy storage device to the electric motor.

22. The power tool of claim 21 further comprising an input device, wherein the control module is configured to control switching of the switches based on input from the input device.

23. The power tool of claim 17 wherein the energy storage device is integrated into the power tool and not removable from the power tool.

24. The power tool of claim 17 wherein the energy storage device is removable from the power tool.

25. The power tool of claim 17 wherein the hybrid supercapacitors store power electrostatically.

26. The power tool of claim 17 wherein nanocarbon material includes graphene.

27. The power tool of claim 17 wherein the energy storage device has a nominal output voltage of at least 24 volts direct current (DC).

28. The power tool of claim 17 wherein the energy storage device has a power density of at least approximately 1000 watts per kg.

29. The power tool of claim 17 wherein the hybrid supercapacitors are each cylindrical.

30. The power tool of claim 29 wherein the hybrid supercapacitors each include two terminals extending outwardly from a circular face of the cylindrical hybrid supercapacitors.

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SUBSTITUTE SHEET (RULE 26)

31 . The power tool of claim 17 further comprising a circuit board, wherein the hybrid supercapacitors are electrically connected via the circuit board and soldering.

32. A charger, comprising: a plug configured to electrically connect to an alternating current (AC) wall outlet; a cable electrically connected at one end to the plug; a converter module configured to receive AC power via the plug and the cable and that is configured to convert the AC power into direct current (DC) power; a charging module configured to, using DC power originating from the converter module, charge a first plurality of hybrid supercapacitors that power an electric power tool; and an energy storage device (a) that is internal to the charger and (b) that includes a second plurality of hybrid supercapacitors, wherein the charging module is also configured to charge the first plurality of hybrid super capacitors that power the electric power tool using power from the second plurality of supercapacitors.

33. The charger of claim 32 further comprising a control module configured to disable the charging module and discontinue the charging when at least one of an overvoltage condition occurs, an over-current condition occurs, and an over-temperature condition occurs.

34. The charger of claim 32 wherein the first plurality of hybrid supercapacitors have a first capacity, the second plurality of hybrid supercapacitors have a second capacity, and the second capacity is greater than the first capacity.

35. The charger of claim 32 wherein the first plurality of hybrid supercapacitors have a first nominal voltage, the second plurality of hybrid supercapacitors have a second nominal voltage, and the second nominal voltage is greater than the first nominal voltage.

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SUBSTITUTE SHEET (RULE 26)