Abstract: A method for manufacturing (large format) Lithium Battery packs, comprising the steps of providing one or more electrochemical cells, entering the one or more electrochemical cells into a pouch, partly sealing the pouch with the one or more electrochemical cells, entering the pouch with the one or more electrochemical cells into a drying oven, resting the pouch in the drying oven for a defined time, removing the pouch from the drying oven, transferring the dried pouches to an electrolyte filling station, filling the pouch with electrolyte and sealing the pouch wherein the manufacturing steps are performed under a normal manufacturing environment conditions, and only selected critical manufacturing steps are performed under dry room conditions.