The Nitecore Summit 20000 power bank offers a high-capacity energy of 20000mAh, paired with an impressive low temperature resistance of -40°C/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 temperature and prevent power loss or inefficiency. The Summit 20000 also includes an insulated carrying bag and a reliable braided USB-C to C cable for seamless power transfer. If you're aiming for the top, make sure you bring along the Nitecore Summit 20000 power bank.