World’s First 10,000mAh Sodium-Ion Flashlight Delivers 2,500 Lumens, Works at -40°C

A new crowdfunded flashlight called the Sodiumfrostglow is getting attention for one specific reason: it uses a sodium-ion battery instead of the usual lithium-ion pack. That might not sound dramatic at first, but in very cold weather, battery chemistry matters a lot.

According to the campaign page, the Sodiumfrostglow is designed to keep working in temperatures as low as -40°C. The makers claim that while lithium-ion batteries can lose a significant portion of their capacity in extreme cold, this sodium-ion battery retains much more of its usable charge. They’re quoting around 88% capacity retention at those temperatures, compared to roughly 15% for lithium under similar conditions.

If accurate, that’s a big deal for winter campers, mountaineers, or anyone dealing with long outages in freezing climates. The device includes a 10,000mAh battery, which also allows it to function as a power bank. It supports USB-C charging at up to 10W and can output 5W to charge smaller electronics like smartphones or GPS units.

Brightness is rated at 2,500 lumens, which puts it firmly in the “serious outdoor tool” category rather than basic household flashlight territory.

The campaign also highlights longevity claims: more than 3,000 full charge cycles and improved tolerance to deep discharge compared to lithium-ion packs. Sodium-ion chemistry is generally considered safer and less prone to thermal runaway, though it’s still a relatively new technology in consumer electronics.

The project first appeared on Kickstarter in late 2025, where it surpassed its $10,000 funding goal and reportedly raised over $20,000 from around 200 backers. It has since moved to Indiegogo for continued funding. Early backer pricing currently sits around $73 plus shipping, with a projected retail price closer to $90.

What makes the Sodiumfrostglow interesting isn’t just the lumen output or battery size. It’s the chemistry choice. Cold weather has always been a weak spot for lithium-ion batteries in everyday hardware.

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