In this work, we present the next generation of magnetoelectric energy harvesters developed by Enerbee Technology, and the associated power management circuit that was developed by CEA-Leti. Enerbee Technology develops a self-sufficient and connected product embedded with sensors for the regulation of indoor air quality in non-residential buildings, providing a low maintenance solution to increase the health and well-being of both the structure and the occupants, for the whole lifetime of the infrastructure. In this new generation of energy harvester, the piezoelectric part of the energy harvester has been optimized to better extract charges from the material. Therefore, a 3.4× size reduction is achieved while maintaining the same harvested energy. On the electronic side, we report a power management circuit based on a low-power implementation of a non-linear extraction technique by controlling a Flyback converter with a microcontroller unit: energy extraction occurs at the maximum voltage of the magnetoelectric harvester, allowing more power to be harvested compared to standard circuits. Compared with the standard energy harvesting interface, a power gain up to 1.75 is measured at a frequency of 47 Hz, and a Flyback efficiency up to 80% is reported for a total power of 0.5 mW.