There is a wide spectrum of hybrid systems, using different types of energy storage, traction motor and controls. All have an internal combustion engine as the primary power source, electric batteries or other systems to store and release energy and a supplementary drive. Most are 'parallel hybrids', which use the ICE and other sources together, with a control system to balance them. But whatever the structure, the effect should be improved fuel efficiency and often better performance and driveability.
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