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Chinese researchers report record for cheap iron battery Researchers at the Chinese Academy of Sciences say they have built a cheap, all-iron flow battery that lasts a record-time. A flow battery stores electricity in liquid chemicals that are pumped through the device, rather than inside solid electrodes as in a lithium-ion battery. In this case, both liquids are based on iron, which is cheap, abundant, and not flammable in water. The team reports more than 6,000 charge-discharge cycles in the lab without measurable capacity loss, a record for this type of battery. It is a lab result, but this could one day matter for storing renewable energy from wind and solar at low cost. Image: Different electrolyte mixtures for the iron flow battery. Source: Wei et al, Advanced Energy Materials (2026): e06734.