A method for constructing a chart of correspondence between a quick discharge and a slow discharge for measuring the wear of at least one electrochemical cell, the method comprising a measuring phase and an ageing phase, the measuring phase including in turn a training sequence followed by a characterisation sequence; during the training sequence, the following operations being implemented: a. charging the at least one cell at a reference current level (C ref) until reaching a predetermined end-of-charge voltage (V max); b. relaxing the at least one cell for a first duration; c. discharging the at least one cell at the reference current level (C ref) until reaching a predetermined end-of-discharge voltage (V min); d. relaxing the at least one cell for a second duration; during the characterisation sequence, the following operations being implemented: i. charging the at least one cell at the reference current level (C ref) until reaching a predetermined end-of-charge voltage (V' max); ii. relaxing the at least one cell for a third duration; iii. discharging the at least one cell at a selected current level until reaching a predetermined end-of-discharge voltage (V' min); iv. relaxing the at least one cell for a fourth duration; the characterisation sequence being reiterated at least once while increasing, each time, the value of said selected current level (C x) with respect to the previous iteration; the time of each discharge being measured so that the actual capacity (C v) of the cell can be deduced at each discharge according to the intensity of each discharge and the measured discharge time; the ageing phase comprising an alternation of charges and discharges with no intermediate relaxation and at the reference current level (C ref); the measuring phase being reiterated at least once with a reference current level (C ref) different from that of the previous iteration, the ageing phase being implemented before each reiteration of the measuring phase, so that an actual capacity (C v) is obtained for a plurality of pairs of parameters, each pair of parameters including a selected current level (C x) and a reference current level (C ref). the method comprising a measuring phase and an ageing phase, the measuring phase including in turn a training sequence followed by a characterisation sequence; during the training sequence, the following operations being implemented: a. charging the at least one cell at a reference current level (C ref) until reaching a predetermined end-of-charge voltage (V max); b. relaxing the at least one cell for a first duration; c. discharging the at least one cell at the reference current level (C ref) until reaching a predetermined end-of-discharge voltage (V min); d. relaxing the at least one cell for a second duration; a. charging the at least one cell at a reference current level (C ref) until reaching a predetermined end-of-charge voltage (V max); b. relaxing the at least one cell for a first duration; c. discharging the at least one cell at the reference current level (C ref) until reaching a predetermined end-of-discharge voltage (V min); d. relaxing the at least one cell for a second duration; during the characterisation sequence, the following operations being implemented: i. charging the at least one cell at the reference current level (C ref) until reaching a predetermined end-of-charge voltage (V' max); ii. relaxing the at least one cell for a third duration; iii. discharging the at least one cell at a selected current level until reaching a predetermined end-of-discharge voltage (V' min); iv. relaxing the at least one cell for a fourth duration; i. charging the at least one cell at the reference current level (C ref) until reaching a predetermined end-of-charge voltage (V' max); ii. relaxing the at least one cell for a third duration; iii. discharging the at least one cell at a selected current level until reaching a predetermined end-of-discharge voltage (V' min); iv. relaxing the at least one cell for a fourth duration; the characterisation sequence being reiterated at least once while increasing, each time, the value of said selected current level (C x) with respect to the previous iteration; the time of each discharge being measured so that the actual capacity (C v) of the cell can be deduced at each discharge according to the intensity of each discharge and the measured discharge time; the ageing phase comprising an alternation of charges and discharges with no intermediate relaxation and at the reference current level (C ref); the measuring phase being reiterated at least once with a reference current level (C ref) different from that of the previous iteration, the ageing phase being implemented before each reiteration of the measuring phase, so that an actual capacity (C v) is obtained for a plurality of pairs of parameters, each pair of parameters including a selected current level (C x) and a reference current level (C ref).