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You can go and buy sodium batteries already. They’re not competitive with Lithium ion batteries in many mobile applications, but very much competitive for everything where price is more important than size or weight.
Lithium has decades of research and industrial scaling behind it, it’s hard to break into that. But especially sodium is on a pretty good path to replace it in large scale storage applications.
Or requires a timestamp with zone offset, but ignores the zone offset, so you have to send the timestamp itself with a zone offset of zero relative to the systems timezone, but can’t just omit the zone offset, because it’s required.