Micromobility stands as a revolutionary paradigm in mobility, revolutionizing both the transportation of goods and personal mobility. Numerous studies are available in the literature that evaluate the impacts along the entire life cycle of these vehicles, frequently relying on secondary data sources. It becomes evident from these studies that the batteries integrated into these vehicles wield substantial influence, underscoring the imperative need for a meticulous analysis to ascertain their true impacts. This study fills this gap by presenting a comprehensive Life Cycle Assessment (LCA) of micromobility vehicle batteries, encompassing both cargobikes and electric Bikes (eBikes), utilizing primary data sources. The construction of the Bill of Materials (BoM) for these batteries involved a process of disassembling the devices, weighing, and cataloging all constituent components. The findings of this study unveil the superiority of primary data over secondary data typically found in LCA databases. Using primary data, the climate change impact category increases by 7.6% for Greencell batteries (Cargobike) and by 14.9% for Bosch batteries (eBike) compared to using secondary data. By employing primary data, this study evades the pitfall of either overestimating or underestimating potential impacts, thus providing a more accurate assessment of the environmental footprint of micromobility batteries.