(US5354625-A)      A metal-air power supply unit has a cell with an air cathode (42) in a housing with a throughflow of air. There are separate inlets for reactant air to the cathode and cooling air to a part of the cell isolated from the cathode. The inlets are isolated from exhausted reactant air and cooling air.    The reactant air flow is limited to give 3-10 times the stoichiometric amount of oxygen required for a set current level, and the coolant air has a vol. flow rate 10-1000 times that of the reactant air flow. The reactant air is pref. passed through a restricting orifice in a barrier. The cell pref. has members and membranes of polypropylene.    USE/ADVANTAGE -   As a lightweight high-power supply for portable electronic equipment, e.g. PC's. Maximises cell useful life and minimises the likelihood of flooding or drying out.    (JP7508370-W)      The supply (10) comprises (i) a housing contg. metal air battery cells (38); (ii) a fan (127) the drives air into the housing; (iii) a valve (275) that splits the air flow so reactant air is ducted to the cells via an inlet manifold (235) and air inlet (50); and (iv) exhaust air leaving the vells via ports (52), exhaust manifold (247) and housing outlet (256).    Coolant air is isolated from the reactant air and flows in under the cells using the valve (275). This valve also limits reactant vol. air flow 3-10 times the 02 level is supplied to the cells for optimum power output whilst also directing 10-1000 times this airflow as cooling air so cell drying and condnsn. risks are minimised.    Pref. supply with ducted air supplies to the cells to optimise power output form cells stacked in a portable case and with a switch (268) that controls the valve (27) to switch the cells on or off or for recharging.    USE/ADVANTAGE -   Used e.g. as a low cost, lightweight, long life, air cooled, metal-air power supply for use with portables pc's.    (JP2783462-B2)      The supply (10) comprises (i) a housing contg. metal air battery cells (38); (ii) a fan (127) the drives air into the housing; (iii) a valve (275) that splits the air flow so reactant air is ducted to the cells via an inlet manifold (235) and air inlet (50); and (iv) exhaust air leaving the vells via ports (52), exhaust manifold (247) and housing outlet (256).    Coolant air is isolated from the reactant air and flows in under the cells using the valve (275). This valve also limits reactant vol. air flow 3-10 times the 02 level is supplied to the cells for optimum power output whilst also directing 10-1000 times this airflow as cooling air so cell drying and condnsn. risks are minimised.    Pref. supply with ducted air supplies to the cells to optimise power output form cells stacked in a portable case and with a switch (268) that controls the valve (27) to switch the cells on or off or for recharging.    USE/ADVANTAGE -   Used e.g. as a low cost, lightweight, long life, air cooled, metal-air power supply for use with portables pc's.