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A cordless power tool has a housing which includes a mechanism to couple with a removable battery pack. The battery pack includes one or more battery cells as well as a vent system in the battery pack housing which enables fluid to move through the housing. A mechanism is associated with the battery

A cordless power tool has a housing which includes a mechanism to couple with a removable battery pack. The battery pack includes one or more battery cells as well as a vent system in the battery pack housing which enables fluid to move through the housing. A mechanism is associated with the battery pack to dissipate heat from the battery pack.

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1. A charger and battery pack combination, comprising:a battery pack comprising a housing having top, bottom and side walls, a terminal tower disposed on the top wall, an air inlet disposed on at least one of the terminal tower and the top wall, and an air outlet for allowing air to exit from the ho

1. A charger and battery pack combination, comprising:a battery pack comprising a housing having top, bottom and side walls, a terminal tower disposed on the top wall, an air inlet disposed on at least one of the terminal tower and the top wall, and an air outlet for allowing air to exit from the housing, a plurality of cells disposed in the housing, and a charger comprising: a charger housing for supporting the battery pack, the charger housing having a first duct opposite of the air inlet of the battery pack; charging circuitry provided within the charger housing; and a fan disposed within the charger housing for blowing air through the first duct and into the battery pack via the air inlet, and for blowing air through a second duct directing cooling air to the charging circuitry. 2. The charger and battery pack combination of claim 1, wherein the first duct and the air inlet of the battery pack are axially aligned.3. The charger and battery pack combination of claim 1, where the first duct and the air inlet of the battery pack are axially misaligned.4. The charger and battery pack combination of claim 1, further comprising a chamber disposed between the first duct and the air inlet of the battery pack.5. A charger and battery pack combination, comprising:a battery pack comprising a housing having top, bottom and side walls, a terminal tower disposed on the top wall, an air inlet disposed on at least one of the terminal tower and the top wall, and an air outlet for allowing air to exit from the housing, a plurality of cells disposed in the housing, and a charger comprising: a charger housing for supporting the battery pack, the charger housing having a first duct opposite of the air inlet of the battery pack and vents disposed near the air exiting from the battery pack housing; a fan disposed within the charger housing for blowing air through the first duct and into the battery pack via the air inlet; wherein air exiting from the battery pack housing creates a low pressure region near the vents. 6. The charger and battery pack combination of claim 5, wherein the first duct and the air inlet of the battery pack are axially aligned.7. The charger and battery pack combination of claim 5, wherein the first duct and the air inlet of the battery pack are axially misaligned.8. The charger and battery pack combination of claim 5, further comprising a chamber disposed between the first duct and the air inlet of the battery pack.9. A method for controlling a charger for charging a battery, wherein the charger comprises a fan for cooling the battery, the method comprising:providing power to the fan so that it rotates at a first speed prior to battery insertion. 10. The method of claim 9, wherein the power is provided when the charger is connected to a power supply source.11. The method of claim 9, wherein the power is provided when the charger is turned on.12. The method of claim 9, wherein the power is provided when a button disposed on the charger is activated.13. The method of claim 9, wherein the power is provided for a predetermined period of time.14. The method of claim 9, further comprising providing power to the fan so that it rotates at a second speed lower than the first speed.15. The method of claim 14, wherein the second speed is equal to zero revolutions per minute.16. A method for controlling a charger for charging a battery usable with an electric device separate from the charger, wherein the charger comprises a housing, and a fan mounted in the housing for cooling the battery, the method comprising:disposing the battery on the housing and electrically connecting the battery to the charger; determining battery temperature; providing power to the fan so that it rotates at a first speed if the battery temperature is above a predetermined temperature; providing power to the fan so that it rotates at a second speed lower than the first speed if the battery temperature is equal to or below a predetermined temperature; and removing the battery from the charger for use with the electric device. 17. The method of claim 16, wherein the predetermined temperature is about 20° C.18. The method of claim 16, wherein the second speed is equal to zero revolutions per minute.19. A method for controlling a charger for charging a battery usable with an electric device separate from the charger, wherein the charger comprises a housing, and a fan mounted in the housing for cooling the battery, the method comprising:disposing the battery on the housing and electrically connecting the battery to the charger; providing power to the fan so that it rotates at a first speed; providing power to the fan so that it rotates at a second speed lower than the first speed determining battery temperature; providing power to the fan so that it rotates at a third speed; and removing the battery from the charger for use with the electric device. 20. The method of claim 19, wherein the second speed is equal to zero revolutions per minute.21. The method of claim 19, wherein the third speed is selected so as to maintain battery temperature at a predetermined temperature.22. The method of claim 21, where the predetermined temperature is about 30° C.23. The method of claim 19, wherein the third speed is about equal to the first speed.24. A method for cooling a battery disposed on a charger, the method comprising:providing a fan in the charger; providing an air inlet in the battery for allowing air to enter the batter; providing an air outlet in the battery for allowing air to exit the battery; providing power to the fan to force air to enter the battery through the air inlet, to exit the battery through the air outlet and to enter the charger, in that order.