this post was submitted on 13 Feb 2026
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Poorly. According to a random Wikipedia query, commodity lithium ion is ~270 Wh per kilogram. So this is around 20% of that, according to the above.
"Excellent" may be in comparison to other byzantine specialty battery chemistries, but lithium ion remains resolutely enthroned.
It might be cool for storing solar energy for your home, though. We don't need to always carry the battery in every use case
Nickel iron is typically used for off grid solar energy storage. Weight doesn't matter at all since the battery won't be moved. The most important thing is lifetime. Traditional nickel iron batteries last for decades and can be refurbished.
Home storage generally uses LFP which is around 170 WH/kg. 270 is NMC which is used in stuff like mobile phones where the trade offs are different.
Quite enough energy density and very good power density for stationary energy storage, with zero fire danger. Reasonably cheap, too.