~Nitecore says~ 

10000mAh Low-Temperature Power Bank

The Summit 10000 power bank combines lightweight and steady carbon fiber technology with a low temperature resistance up to -40° C/F. Normal power banks drop efficiency significantly in cold climates. Summit 10000 can still charge a modern smartphone two times over on top of Mount Everest, thanks to its intelligent heating function which kicks in when the temperature is below the freezing point. This heating function consumes ultra low power while keeping the power bank at an appropriate temperature to avoid loss of power or efficiency under cold climates. Also comes with an insulated carrying bag as well as a braided USB-C to C cable for reliable power transfer in cold weather. It takes power to make it to the top, so why not the Nitecore Summit 10000.

USB/USB-C Dual Ports

The Summit 10000 comes with a Quick Charge Power Delivery (QC PD) USB-C port that can fast charge the power bank or quick charge other devices at 18W and 20W respectively, as well as a USB-A QC output port to charge all sorts of electronic accessories. When the quick charge is not desired for delicate devices such as bluetooth headphones or smartwatches, the Summit 10000 has a one-touch low current mode.

Lightweight and Durable

The Nitecore Summit 10000 is built with a unibody carbon fiber shell making it steady yet extremely lightweight at only 6.07 ounces. The seamless design is not only 1.5 meters impact resistant but also IPX5 rated water resistant, ready for outdoor uses.