These custom BMS harnesses are for the 16S LG Chem battery module. They allow for easy plug and play from the battery module, and also simplify the process of running a series-parallel setup by allowing our 'daisy chain' PCB boards for the LG Chem cells. Each battery module requires one harness and one PCB board. Warranty Period: One year factory warranty under normal use and service. Dilithium BMS for 2P6S - 16S LG Chem Modules 2 Enclosure-Series Wiring Click Here for plug schematic