Abstract: Method for determining the state of health of a battery, using a sensor of the acoustic activity of the battery, comprising the following steps: detection of at least one acoustic event by the sensor; determination of the value of at least one parameter for each acoustic signal detected in the course of the elementary cycle of use; calculation, for the elementary cycle of use, of a value of acoustic density according to a density calculation function taking into account said at least one parameter determined for each of the acoustic signals detected in the course of the cycle; calculation of a state of health value corresponding to said previously calculated acoustic density value, on the basis of a functional relation or a predetermined database, making it possible to know the state of health for a given acoustic density value.

Abstract: Method of operation of a device for determining a feature of a battery from among the state of charge of the battery, the state of health of the battery and the capacity of the battery, the device comprising a man-machine interface, the method comprising receiving a request to determine an actual value of the feature of a battery, determining, by interrogating a user via the man-machine interface, the next date at which a consuming device will need energy from the battery, verifying that it is possible to determine the actual value of the feature of the battery by the next date, and if such is the case, determining the actual value of the feature of the battery by carrying out a phase of charging and/or discharging of the battery.