Abstract: The autonomous electronic module (1) includes: —a cell (2) providing a supply current (Icell) to the electronic module, —a resistor (2) connected in series with the cell, the resistor exhibiting terminals, —elements for measuring a voltage (20) across the terminals of the resistor and elements for evaluating the charge remaining (10, 11, 12), arranged so as to process a measurement of the voltage in order to calculate the charge remaining of the cell (2).