Pump battery system

An adjustable flow battery system comprising a cell containing two electrodes and a porous separator therebetween so as to define first and second compartments, an electrolyte reservoir, a first conduit interconnecting said first compartment to said reservoir, a second conduit interconnecting said second compartment to said reservoir, said first conduit having a greater resistance to flow of electrolyte than said second conduit, a third conduit interconnecting said reservoir and said cell, and a variable speed pumping means associated with said third conduit, whereby said system is adapted to separate anode and cathode products on charge while permitting distinct flow through said porous separator on discharge.