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China's new iron battery hits 99.4 percent efficiency over 6000 cycles
(interestingengineering.com)
This is a most excellent place for technology news and articles.
This article is just blogspam reporting of an SCMP article, which also doesn't link to the paper, which is here: https://advanced.onlinelibrary.wiley.com/doi/10.1002/aenm.202506734
But the full text is not available there. You might be able to find it elsewhere.
Now, is that cause for worry or am I silly?
I don't think China does April Fools' Day.
Scientists generally don't do it.
Now, Feynman day (11 May) on the other hand...
The publication date would be decided by Wiley.