Process for the management and diagnosis of a battery

A method of managing a battery characterized in that it comprises a step of estimating its state from a complete discharge step (E1) of the battery and taking into account the Tfindch battery temperature related this complete discharge (E2) and from a full charging step of the battery (E3) and consideration of the Tfinch temperature of the battery connected with this full charge (E4), these two steps of loading and discharge being consecutive.