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Accelerating rate colorimeter (ARC) is used to analyze the thermal properties of two types Li-ion based commercial batteries, LiCoO2/C and LiFePO4/C, with various states of charge (SOC) and aging conditions. Also, with electrochemical impedance spectroscopy (EIS) and battery performance under different stages, the internal situations of the batteries would be better understood to explain the behaviors on thermal properties. Results showed LiFePO4/C based battery possesses better thermal equity than that of LiCoO2/C type. The effect of aging would somehow prolong the exothermic behaviors of batteries may due to the extra formation of solid electrolyte inter-phase, which is shown on the impedance increase from SEI and capacity loss.