This thesis is an improvement of the electronic systems that compose WAPPFRUIT, a regional project focusing on smart technologies for water management in fruit growing, aiming to promote rural development in the Piedmont region. The project deployed systems to collect essential soil data (e.g., soil temperature, matric potential, volumetric water content) using LoRa network nodes to characterize and irrigate orchard fields. Efficient and long-lasting power supply is crucial for these systems. They rely on a primary battery in lithium-thionyl chloride (LiSOCl2) chemistry without estimating the SOH (State of Health) battery. This chemistry is challenging in the monitoring of this parameter. When the battery is almost dead, there is a steep voltage drop phenomenon, making end-of-life detection vital in such a way as to prevent an electronic system for real-time monitoring from being switched off suddenly.