Working Temperature 0°C ~50°C Charge -10°C ~50°C Discharge Shelf Temperature -20°C ~45°C Short current/duration time <2000A/1ms Cooling type Natural Breaker No Yes Protective class I IP rating of enclosure IP20 Humidity 5% ~ 95%(RH) No Condensation Altitude(m) ≤ 4000 Certification TÜV / CE / UL / UN38.3 Design life 15+ Years (25°C /77℉)< /div>