A method for managing the state of charge of an accumulator coupled to a system for controlling the accumulator, the state of charge being limited to a value lower than a maximum state of charge (SOC max), characterized in that it involves all the following steps repeated over time so as to cause said maximum state of charge to evolve over time: - determining the state of health (SOH(t)) of said accumulator at an instant t; - determining the maximum state of charge defined by a user SOC max-user; and in that the step of determining the maximum state of charge defined by the user comprises: ∘ determining a usage profile expressed by the parameter of the state of charge SOC over time; ∘ determining an overdimensioning of said accumulator relative to an initial usage requirement, so as to define a minimum value of the parameter SOC max-user, the maximum value of the parameter SOC max-user being equal to the maximum state of charge defined in the control system of the accumulator SOC max-BMS; ∘ periodically determining the ratio of the average ageing to the loss of the state of health SOH of said accumulator depending on the parameter of the state of charge SOC defining, by increasing values of the state of charge SOC, at least: ▪ a moderately accelerated ageing working area over an interval Δ 1 SOC; ▪ a comfortable intermediate working area with small variations in ageing parameters over an interval Δ 2 SOC, the minimum value of SOC max-user ranging within said interval; ▪ an accelerated ageing working area over an interval Δ 3 SOC; ∘ determining a value of SOC max-user that is defined by the equation: SOC max − user = SOC max − user min + Δ 1 SOC; - determining the maximum state of charge SOC max (t) depending on said state of health SOH(t) according to the following equation: SOC max t = min SOC max − user + 100 − SOH t, SOC max − BMS. - determining the state of health (SOH(t)) of said accumulator at an instant t; - determining the maximum state of charge defined by a user SOC max-user; and in that the step of determining the maximum state of charge defined by the user comprises: ∘ determining a usage profile expressed by the parameter of the state of charge SOC over time; ∘ determining an overdimensioning of said accumulator relative to an initial usage requirement, so as to define a minimum value of the parameter SOC max-user, the maximum value of the parameter SOC max-user being equal to the maximum state of charge defined in the control system of the accumulator SOC max-BMS; ∘ periodically determining the ratio of the average ageing to the loss of the state of health SOH of said accumulator depending on the parameter of the state of charge SOC defining, by increasing values of the state of charge SOC, at least: ▪ a moderately accelerated ageing working area over an interval Δ 1 SOC; ▪ a comfortable intermediate working area with small variations in ageing parameters over an interval Δ 2 SOC, the minimum value of SOC max-user ranging within said interval; ▪ an accelerated ageing working area over an interval Δ 3 SOC; ∘ determining a value of SOC max-user that is defined by the equation: SOC max − user = SOC max − user min + Δ 1 SOC; ∘ determining a usage profile expressed by the parameter of the state of charge SOC over time; ∘ determining an overdimensioning of said accumulator relative to an initial usage requirement, so as to define a minimum value of the parameter SOC max-user, the maximum value of the parameter SOC max-user being equal to the maximum state of charge defined in the control system of the accumulator SOC max-BMS; ∘ periodically determining the ratio of the average ageing to the loss of the state of health SOH of said accumulator depending on the parameter of the state of charge SOC defining, by increasing values of the state of charge SOC, at least: ▪ a moderately accelerated ageing working area over an interval Δ 1 SOC; ▪ a comfortable intermediate working area with small variations in ageing parameters over an interval Δ 2 SOC, the minimum value of SOC max-user ranging within said interval; ▪ an accelerated ageing working area over an interval Δ 3 SOC; ▪ a moderately accelerated ageing working area over an interval Δ 1 SOC; ▪ a comfortable intermediate working area with small variations in ageing parameters over an interval Δ 2 SOC, the minimum value of SOC max-user ranging within said interval; ▪ an accelerated ageing working area over an interval Δ 3 SOC; ∘ determining a value of SOC max-user that is defined by the equation: SOC max − user = SOC max − user min + Δ 1 SOC; - determining the maximum state of charge SOC max (t) depending on said state of health SOH(t) according to the following equation: SOC max t = min SOC max − user + 100 − SOH t, SOC max − BMS.