Larger battery or ultracap can store energy derived from regen braking. Stores far more energy than a weak parallel hybrid because it can run on the electric motor alone as the primary traction power, although the ICE is still primary. The Toyota Prius, for example, has 1.3 kWh of battery and can run on the drive motor alone (until the computer turns on the ICE at 43 mph, or when the smog gear is cold). Toyota was first to market with this idea..
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EVs compared with hybrids, fuel-cell vehicles, and gasoline-powered vehicles for pollution, energy, practicality. Letter-writing site to support the requirement that some percent of new cars be EVs by 2003. more
