A sensor module (112) for determining a concentration of at least one analyte in a body fluid of a user is disclosed. The sensor module (112) includes at least one sensor element (116) adapted to determine the concentration of the analyte, wherein the sensor element (116) is at least partly implantable into a body tissue of the user； at least one control device (118) connected to the sensor element (116), wherein the control device (118) includes at least one data collection device (122) adapted to collect measurement data acquired by using the sensor element (116). The control device (118) further includes at least one wireless near-field communication device (124) adapted to transmit measurement data. The control device (118) further includes a rechargeable energy storage device (134) and is adapted to transmit at least one demand for recharging the rechargeable energy storage device (134) via the near-field communication device (124).
