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China's new iron battery hits 99.4 percent efficiency over 6000 cycles
(interestingengineering.com)
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this post was submitted on 29 Apr 2026
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There's always a catch, details matter.
Some chemistries can only work if heated up to a certain temperature.
Some cannot supply high currents. Some perform badly at lower temperatures. Some are expensive to produce. Some have a very low energy density per weight or volume. Some are hard to create consistently and require a lot of balancing. Some cannot be scaled up easily. Some are prone to aging regardless of cycles. Some even require manual maintenance.
It's hard to make a cell that does everything right. Cycle life is only one out of a huge list of parameters.