NITECORE SUMMIT 20000NITECORE SUMMIT 20000 power bank offers a high capacity energy of 20000mAh, paired with an impressive low temperature resistance of 40C F. Unlike other power banks that lose efficiency in cold temperatures, the Summit 20000 can still charge a modern Phone up to 4. 6 times even on top of Mount Everest. When temperatures drop below freezing, the Summit 20000's intelligent heating function activates, consuming ultra low power to maintain optimal