It automatically stops the engine when the vehicle comes to a halt and instantly restarts it when the vehicle must move again. Not to be confused as just a "start-stop" system, the electric motor also assists somewhat during initial launch, during torque smoothing and when under heavy acceleration. A 36-volt nickel metal hydride (NiMH) battery pack, located under the load floor, powers the motor/generator unit and also stores regenerative braking energy. The regenerative charging and electric motor assist functions are shown to the driver via an analog gauge on the dash board, and real-time fuel-economy feedback is accomplished via an "eco" light that glows when the instantaneous fuel economy is beating the window sticker fuel economy values.