The initial promise was that Na batteries would be the cheapest ones. But economies of scale make it that they are the most expensive due to the fact that they are not produced en-masse. So this is just a novelty item with some very specific advantages and a high price.
The new "Sodiumfrostglow" flashlight is designed to handle temperatures down to -40°F thanks to its sodium-ion battery, and it can also be used as a power bank. After a successful crowdfunding campaign on Kickstarter, the manufacturer is now looking for backers on Indiegogo.
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