The top deck comes from manzanita micro. They have a large inventory of these in several sizes. I am using them on calb100 amp cells. Manzanita had these built. For vehicle battery packs. They also built bms systems older tech but sophisticated. They have a large inventory of the decks but no market. For them at present. If interesting call rich at manzanita. Micro. They built sophicated chargers and. Rich has close to twenty years experience testing and stressing lithium batteries in a drag racing environment