... charge/discharge)Internal Resistance≤1.3mΩCut-off Charge Voltage4.20V±0.01VStandard Charge MethodCharge the battery at a constant current ... Electric Vehicle3.We can also do the battery pack customized for you:4. About us:Qinhuangdao Xinchi Photoelectricity Technology Co.,Ltd ... .Certificates we have acquired: ISO,CE, UN38.3, MSDS, ROSH, DGM. 3.8V30Ah lithium ion battery for pure electric bus, e-car, EV