... pure electric bus 3.Material: Li polymer 4.Warranty: 3 years 3.8V 30Ah Pure Electric Bus Li Polymer Battery ... a constant current of 15A ( 0.3C1A) to 4.2V, and then charge at a constant voltage of ... can also do the battery pack customized for you:4. About us:Qinhuangdao Xinchi Photoelectricity Technology Co.,Ltd. ... ISO,CE, UN38.3, MSDS, ROSH, DGM. 3.8V 30Ah Li Polymer Battery for Pure Electric Vehicle