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For LFP, a flat open-circuit voltage curve obscures cell aging. This presentation demonstrates how monitoring millivolt-level behaviors extracts gigawatt-hours of latent capacity. By combining physics-informed models with electrochemical state estimation, we resolve LFP and graphite phase-transitions. Operational data shows how these voltage signatures drive predictive aging forecasts and anomaly detection, unlocking safe operation beyond industry-standard warranties. \n\nBiography:\nDr. Kandler Smith is Technical Fellow for Energy Storage Modeling at Moment Energy, a second-use battery energy storage company. He previously worked for 19 years at U.S. DOE\u2019s National Renewable Energy Laboratory as Team Lead for Electrochemical Modeling & Data Sciences, developing multi-physics models of battery performance, lifetime, safety and technoeconomics. 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