A Battery Management System (BMS) is an essential component of any Battery Energy Storage System (BESS). It ensures safe, efficient, and reliable operation by monitoring, controlling, and protecting battery cells from faults and failures. These cells pack the highest energy density but need careful. Lithium-ion batteries are lighter, more efficient, and last longer than lead-acid — but they also require protection. Like lead-acid batteries, lithium batteries can be permanently damaged by overcharging, deep discharging, or extreme temperatures.