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A vehicle having an electric hybrid power system is provided. A battery pack stores electricity to power the electric motor. The battery pack includes a first plurality of batteries connected in parallel with a second plurality of batteries. The first plurality of batteries are Nickel Metal Hydride

A vehicle having an electric hybrid power system is provided. A battery pack stores electricity to power the electric motor. The battery pack includes a first plurality of batteries connected in parallel with a second plurality of batteries. The first plurality of batteries are Nickel Metal Hydride (NiMH), and the second plurality of batteries provide high power output at lower temperatures. In addition, the second plurality of batteries may also have a low energy density.

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1. A power supply for a vehicle, comprising: a plurality of first batteries; and a plurality of second batteries being connected in parallel with said plurality of first batteries, said plurality of first batteries and said plurality of second batteries being configured to provide and receive a

1. A power supply for a vehicle, comprising: a plurality of first batteries; and a plurality of second batteries being connected in parallel with said plurality of first batteries, said plurality of first batteries and said plurality of second batteries being configured to provide and receive a source of power from an electric machine; and wherein said electric machine is a motor/generator being configured, dimensioned, and positioned to provide either a negative or positive torque force to a vehicle drivetrain. 2. A power supply as in claim 1, wherein said first plurality of batteries are nickel metal hydride batteries and said second plurality of batteries are thin film lead acid batteries. 3. A power supply as in claim 1, wherein said first plurality of batteries are thirty nickel metal hydride cells, each having a 1.2-volt output, and said second plurality of batteries are three thin film lead acid batteries, each having a 12-volt output. 4. The power supply as in claim 1, wherein said vehicle is a hybrid vehicle. 5. The power supply as in claim 1, further comprising: an inverter for converting AC power to DC power, said inverter being electrically coupled between said motor/generator and said electric storage medium. 6. A power supply for a vehicle, comprising: a plurality of first batteries, said plurality of first batteries being nickel metal hydride; a plurality of second batteries being connected in parallel with said plurality of first batteries to form an electric storage medium, said plurality of first batteries and said plurality of second batteries being configured to provide and receive a source of power from an electric machine, said electric machine providing either a driving force or a stopping force to at least one ground engaging drive wheel of said vehicle, wherein said second plurality of batteries are capable of providing high power output at colder temperatures; and wherein said electric storage medium is in fluid communication with an exhaust plenum of said vehicle's heating, ventilation and air-conditioning system. 7. The power supply as in claim 6, wherein said second plurality of batteries are lead acid batteries. 8. The power supply as in claim 6, wherein said electric storage medium weighs less than ninety pounds and is configured for use with a 42 volt system. 9. The power supply as in claim 6, wherein said second plurality of batteries is maintained at a high state of charge. 10. The power supply as in claim 6, wherein said second plurality of batteries has a low energy density with respect to said first set of batteries. 11. A power supply as in claim 6, wherein said plurality of second batteries provides higher output at lower temperatures with respect to said plurality of first batteries, said plurality of second batteries being connected in parallel with said plurality of first batteries. 12. A power supply as in claim 11, wherein said first plurality of batteries are nickel metal hydride batteries and said plurality of second batteries are lead acid batteries. 13. The power supply as in claim 6, wherein said plurality of first batteries maintains said plurality of second batteries at a high state of charge. 14. The power supply as in claim 6, wherein said first temperature is about -29 degrees Celsius. 15. The power supply as in claim 14, wherein said plurality of second batteries provides about 9000 watts of energy during an engine cranking event, while said plurality of first batteries provides about 2000 watts of energy during said engine cranking event, when the power supply has a state of charge of about 100 percent. 16. The power supply as in claim 6, wherein said plurality of second batteries absorbs about 2100 watts of energy during said regenerative braking event, while said plurality of first batteries receives about 4900 watts of energy during said regenerative braking event, when the power supply has a state of charge of about 100 percent.