Need a power bank for seriously cold temps? I tested one at -20F and it held its own

4.6 / 5 Very good Fantastic temperature range. Holds up to 60% of charge capacity at -40F. Small and light. Only 15W of output when using both ports. Your average power bank is built to perform in normal day-to-day situations: at home, the office, or the chic coffee shop a few minutes’ walk from work. They aren’t built for harsh environments. In fact, blistering highs of 140°F and sub-zero lows hitting -40°F will kill an ordinary battery. Throw moisture into the mix, and most power banks will be dead in a matter of minutes. But not the Nitecore Summit Air. This power bank is just as happy in…