this post was submitted on 13 Dec 2025
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flashlight

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Portable illumination

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World's 1st Sodium-Ion Flashlight: Engineered for Winter (kickstarter) (for info only, this looks ridiculous tbh) (www.kickstarter.com)
submitted 1 week ago by solrize@lemmy.world to c/flashlight@lemmy.world
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Fwiw Molicel INR 21700's are rated for discharge down to -40C (pdf) though charging only down to 0C. I don't see a need for a sodium ion flashlight just yet, but I'm posting anyway since I guess it's news despite being stupid.

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[–] solrize@lemmy.world 2 points 5 days ago

I've generally heard that it's ok to discharge LFP batteries to 0%. You just shouldn't store them that way (or at 100%) for long periods. Keep in mind that LFP has maybe half the energy density of the highest density NMC batteries, and sodium has maybe half that of LFP. Sodium really doesn't sound that good batteries for portable devices.