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It’s not that one charging location was down. It’s that the current battery tech can’t charge in cold conditions without using some of its own power to heat the battery cells. This means people need to anticipate the cold and charge earlier and more often than they typically do.
Those who didn’t were stranded.
This is a real limitation of the current technology. Not a deal breaker for most people, but it’s a learning curve and a potential inconvenience.
For flexibility and size I like external m.2 enclosures. I have some from Sabrent, Orico and Rosewill. Of them all the Rosewill is the smallest, has the nicest build quality, and seems to dissipate heat the best.
So I would recommend a Rosewill 9SIA072GJ92919, and add an NVMe SSD of your choice.
I think your MacBook is Thunderbolt 2, so you won’t get full speed but it should still be plenty fast. And this enclosure will give you TB3 speeds if you upgrade your PC later.