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As lithium iron phosphate (LFP) batteries become the dominant chemistry for large-scale battery energy storage systems, accurate state-of-charge (SOC) estimation has emerged as a critical challenge. Due to LFP’s flat voltage profile, traditional SOC methods can struggle to deliver the precision required for reliable dispatch, compliance and revenue optimisation. This insight from Clarke Energy explores why SOC accuracy matters, the limitations of conventional approaches, and how advanced estimation strategies can unlock better performance from LFP-based BESS assets.