Embodiments of the invention comprise forming a billet from molten steel and hot rolling the billet to reduce the cross sectional area of the billet. Each of the mandrel portions may include a connector element coupling region and an electrode coupling region. The battery structure also comprises a heat dissipating member disposed between at least one unit cell layer and another unit cell layer. A fluid return line is connected between the mixing unit and at least one of the interim tank and the ink tank, the mixing unit receiving fluid from at least one of the interim tank and the ink tank and mixing the fluid with the high solids content ink.