An aqueous electrolyte aluminum-air battery comprises one or more cells, each cell comprising a frame which defines an electrolyte chamber. The frame is made of a rigid material inactive to the electrolyte. The cell has a consumable aluminum anode and an air cathode spaced from the anode by said electrolyte...http://www.google.co.uk/patents/US4925744?utm_source=gb-gplus-sharePatent US4925744 - Primary aluminum-air battery
