Overview of Techniques for State of Charge Estimation in Lithium-Ion Batteries and Future Directions Nidale Errifai, Aziz Rachid, Bilal Boudmane and Idriss Mortabit EPJ Web Conf., 330 (2025) 07003 Published online: 30 June 2025 DOI: 10.1051/epjconf/202533007003