The parts chosen to equip the EFB come from the best brands. - The engine is a BAFANG “brushless”, which guarantees durability. BAFANG is one of the world leaders, and won the prestigious 24H VAE race, ahead of Bosch, Shimano and Yamaha teams.- The batteries are top of the range, equipped with Samsung Li cells. -ion state-of-the-art, which represents a guarantee of its reliability. They are also protected against under and overcharge and are equipped with a cell temperature controller.In any case, motors and batteries are obviously covered by the 24 month warranty