http://media.ford.com/newsroom/feature_display.cfm?release=17463

"The hybrid storage battery pack consists of 250 D-sized cells in a sealed enclosure with a thermal management system to keep the battery pack at its optimum temperature."

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When coming to a stop, Escape Hybrid's electric motor and regenerative braking system capture energy that normally would be lost as heat developed by the four-wheel disc brakes. As the driver presses the brake pedal, Escape Hybrid's electric drive system transforms the vehicle's momentum into electric energy. This energy gets transferred to the 330-volt nickel-metal-hydride battery pack, where it is stored for later use, saving gasoline and eliminating the need to plug the vehicle into an electric outlet.
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