... current4A Can be choosed)Working temperatureCharge-20~45°C,45~85%RHDischarge-20~60°C,45~85%RHStorage temperature andhumidity0ne month: -20 ... ~+55°C,45~85%RHTwo months: -20~+45°C,45~85%RHOne year: -5~+20°C,45~85%RHCycle life500 ... safe performance 12. Self balance Temperature: Charging temperature: 0 +/- 45 C degrees Discharging temperature: -20 +/- 60 C degrees Storage temperature: -20 +/- 45 ...