Abstract: The invention relates to a combined. power storage system. (100a), comprising an accumulator storage unit (1a) having at least one rechargeable accumulator cell (2a-2f) and comprising a capacitor storage unit: (3a) having at least one capacitor (4a-4f), wherein the accumulator storage unit (1a) and. the capacitor storage unit (3a) are connected in parallel with each other and wherein both the accumulator storage unit (1a) and the capacitor storage unit (3a) can be controlled at the same time by means of a common management system (9a-9c).

Abstract: In order to charge a rechargeable lithium-cobalt cell having a capacity C, the charging current undergoes several cycles (Z1, Z2) and each cycle (Z1, Z2) comprises high-current and low-current phases of different length. During a low-current phase, the current value is I1=C*0.090 (wherein I1 is in amperes and C is in ampere hours), and during a high-current phase, the current value is I2=C*0.165. It has been shown that the cell can thereby be charged at higher energy density and aging effects can thereby be reduced.