Method of determining, by means of an electronic data processing device, a first discharge sequence applicable to a lithium-ion cell at a given temperature, this sequence comprising a first phase of cell discharge under a current I START smaller than or equal to the maximum current I MAX applicable to the cell at said temperature, down to a discharge level Cd TH-OPT , followed by a second phase of cell discharge under a current I NOM greater than current I MAX , this method comprising the steps of: a) determining a threshold U TH corresponding to the minimum voltage below which the cell should not fall to avoid damage; b) determining the maximum discharge current I MAX applicable to the cell at said temperature as being the highest current for which the local minimum value U MIN through which the cell voltage transits at the beginning of the discharge is greater than threshold U TH ; c) performing at least one discharge of the cell, at said temperature, according to a second discharge sequence comprising a first phase of discharge under current I START , until the quantity of charge extracted from the cell since the beginning of the discharge sequence reaches a predetermined threshold Cd TH , followed by a second phase of discharge under current I NOM , and measuring a plurality of points of the curve (d(i)) of cell discharge during the second phase; d) determining the ordinate at the origin (U 0 (I NOM )) of a curve of cell discharge, at said temperature, under current I NOM ; e) determining, by extrapolation from the points measured at step c) and from the ordinate at the origin determined at step d), a function h representative of the curve of full discharge of the cell, at said temperature, under current I NOM ; and f) determining the value of the discharge level Cd TH-OPT based on the function h determined at step e). a) determining a threshold U TH corresponding to the minimum voltage below which the cell should not fall to avoid damage; b) determining the maximum discharge current I MAX applicable to the cell at said temperature as being the highest current for which the local minimum value U MIN through which the cell voltage transits at the beginning of the discharge is greater than threshold U TH ; c) performing at least one discharge of the cell, at said temperature, according to a second discharge sequence comprising a first phase of discharge under current I START , until the quantity of charge extracted from the cell since the beginning of the discharge sequence reaches a predetermined threshold Cd TH , followed by a second phase of discharge under current I NOM , and measuring a plurality of points of the curve (d(i)) of cell discharge during the second phase; d) determining the ordinate at the origin (U 0 (I NOM )) of a curve of cell discharge, at said temperature, under current I NOM ; e) determining, by extrapolation from the points measured at step c) and from the ordinate at the origin determined at step d), a function h representative of the curve of full discharge of the cell, at said temperature, under current I NOM ; and f) determining the value of the discharge level Cd TH-OPT based on the function h determined at step e). <EOS>