Axiosa Nalendra Haidar Putra, et al. “Estimation of Lithium-Ion Battery State of Charge: A Comparative Study of Four Variants of Kalman Filters Based on Equivalent Circuit Model”. Emitor: Jurnal Teknik Elektro, vol. 26, no. 1, Mar. 2026, pp. 31-41, doi:10.23917/emitor.v26i1.15149.