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At the moment, almost all of Transport for London's (TFL's) buses are powered by diesel engines, with Links of London Dome Jade Charm exception of 56 buses that use hybrid propulsion systems. The hybrid fleet was a trial launched in 2006 when a number of manufacturers were brought in to test the suitability of Links of London Dress Charm hybrid drivetrains in the urban environment. The options were split into two categories: a parallel hybrid, where the bus is driven by the battery or directly by the engine, or a series hybrid system, where there is no direct link between the engine and wheels, with the bus driven solely by battery power. Wrightbus and ADL went for the series-hybrid drivetrain with a lithium-ion battery pack, while Volvo and Optare Links of London Duck Charm the parallel hybrid, with the latter opting for a nickel-metal hydride battery over lithium ion. Series hybrids are recognised as being more suitable for Links of London E Charm-stop applications. 'In 95 per cent of drive cycles, a series system is more efficient,' said Brian Maybin, Wrightbus engineering director.