A method of estimating the charge of a battery of a motor vehicle

This method of estimating the charge of a battery of a motor vehicle using a sensor providing the terminal voltage of the battery, the current flowing in the battery and the temperature thereof, ci.Des current variations are measured predetermined time intervals to be determined by integration of load variations of the battery.A modeled voltage having a component corresponding to the battery and a component corresponding to its polarization is determined by the current and the temperature in the using an estimated voltage theorique.La model is compared with the voltage measured to determine an error of tension.Une adaptation of the theoretical model is performed according to the operating phase of the battery and depending on the error determined voltage by acting on the charge state of the battery and / or the estimated polarization of the battery.