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"The storage initial SOC level is also one of the admitted factors of battery ageing during its calendar life. According to these studies [32,43], a high SOC level (>70%), or a low one (<30%), engenders a huge potential disequilibrium on the electrode/electrolyte interface and this accelerates chemical reactions. All through this experiment, the battery was under extreme SOC (>90% or <10%) quite often during each use session. However, most of storages happened during the fifth session (Table 3), and the SOC level is here considered at a critical low level (Fig. 7). This observation can also explain the ageing results of the fifth session.