Method for estimating a battery state of health

A method of calibrating a battery for storing calibration data relating to its condition, characterized in that it comprises the following steps: E1: determining at least one characteristic state of the battery, intermediate between its full charge and full discharge by detecting a peak of the evolution of the derivative of its open circuit voltage during a charge or discharge of the battery, or at least one characteristic state at full charge or full discharge, or defined by the passage of a voltage threshold, respectively current during a current phase imposed imposed voltage respectively during a charge or discharge of the battery; E2: defining a reference state of the battery from this characteristic condition; E4-E7: measuring IVCOs load voltages of the battery to the reference state for several distinct health states Sohi and storing these calibration data comprising at least pairs of real values ​​health status / open circuit voltage (Sohi , IVCOs) in an electronic memory.