Temperature monitoring in Battery Packs is not limited to electric vehicles. An NTC sensor mounted directly on a battery cell can help the BMS detect Hot Spots, monitor temperature differences and support effective thermal management. This article examines the Variohm Eurosensor ETP-ST-21-35-B57861S0103A039, an NTC 10K Sleeve Temperature Sensor designed for cylindrical cells, and explores its relevance to UAVs, robotics, defense systems, ESS and industrial applications.