flashlight

It wouldn't surprise me if there's not yet any sodium charging chip for small consumer electronics like this. I haven't heard of a sodium powered flashlght, phone, or anything like that before. The only sodium consumer device I know of right now is a Bluetti power station which has 900WH: https://www.bluettipower.com/products/sodium-ion-battery-pioneer-na

It got some attention at its anouncement but tbh it's 10lb heavier and $300 more expensive than the 1024WH lithium version (Elite 100v2). So it's for early adopters only.

If you want to charge a small sodium cell, you can probably program an MCU to deliver the right charge profile, along with a few small external parts. That's how Apple phones worked at least in the past. They saved a fraction of a penny by just incorporating some extra logic and code in their big ASIC instead of having a separate charging chip. It's kind of interesting that the charger was programmed in Forth, on a special Forth processor (b16-small) that they cooked into a hardware macro: https://bernd-paysan.de/b16.html . They hired Bernd (the b16 designer) to write the code and it was pretty intricate because of the cpu's limitations. I don't think I'd have used that approach ;).