Bosa New Energy LF90-1p4s Lithium-ion Battery for Electric Bus Electric Truck We are listed N0.3 E-bus battery supplier in 2018. We have been working with Yutong, which is the biggest electric bus manufacturer, CRRC and GOLDEN DRAGON, Product Merits: -- 5 years full warranty; Cells under liability insurance -- Warehouse in Germany and intime replacing service; -- Cells are all under product liablity Insurance and 100% risk free for Partner. -- 10GWH capacity and perfect price to performance Ratio; -- Professional sales and Technical support 7/24 service;