NOVELTY - A portable fuel cell system comprises independent 4 groups (Ia, Ib, Ic, Id) each consisting of 2 stacks made up of 7 cells each of which are electrically connected to each other in series, common plate between 2 stacks in each group where each stack consisting of 7 cells, corrosion resistant current collector (14) placed next to the anode and cathode of the 7-cell stack, pumps (3a, 3b) that send the fuel and oxidant from the storage tanks through anode (4a) side and cathode (4b) side distributing unit input lines, distributing unit (5a).    USE - As portable fuel cell system useful in portable electronics, vehicles, electricity/heat production plants, as well as military and civil institutions.    ADVANTAGE - The portable fuel cell system do not deteriorate the fuel cell performance of the oxygen formed from the hydrogen peroxide (aq) and hydrogen that generates energy by using direct sodium borohydride and hydrogen peroxide (aq) formed from sodium borohydride, the sake of practice of integration and operation, soonest and easily replaced of a problematic cell with a new one in the beginning or during the operation and minimizing weight and volume. The integration replaces problematic cell with new one easily and quickly in the beginning or during the operation.    DETAILED DESCRIPTION - A portable fuel cell system consisting of multiple modules and multiple cells in the modules, for providing do not deteriorate the fuel cell performance of the oxygen formed from the hydrogen peroxide (aq) and hydrogen that generates energy by using direct sodium borohydride and hydrogen peroxide (aq) formed from sodium borohydride, the sake of practice of integration and operation, soonest and easily replaced of a problematic cell with a new one in the beginning or during the operation and minimizing weight and volume comprises independent 4 groups (Ia, Ib, Ic, Id) each consisting of 2 stacks made up of 7 cells each of which are electrically connected to each other in series, in which the fuel and the oxidant are only feed to the stack, common plate (21) is used by both of the 2 sub-stacks. Common plate between 2 stacks in each group where each stack consisting of 7 cells, corrosion resistant current collector (14) placed next to the anode and cathode of the 7-cell stack, pumps (3a, 3b) that send the fuel and oxidant from the storage tanks through anode (4a) side and cathode (4b) side distributing unit input lines, distributing unit (5a) has minimum 8 distributing point for anode input flow and collecting unit (10a) has minimum 8 collecting point for anode output flow, distributing unit (5b) has minimum 8 distributing points for cathode input flow and collecting unit (10b) has minimum 8 collecting points for cathode output flow. An INDEPENDENT CLAIM is included for fuel cell system for providing do not deteriorate the fuel cell performance of the oxygen formed from hydrogen peroxide (aq) and hydrogen that generates energy by using direct sodium borohydride and hydrogen peroxide (aq) formed from sodium borohydride comprising the simultaneous transportation of fuel and oxidant solutions from the fuel tank and the oxidant tank with the fuel pump and the oxidant pump to the anode and cathode, distribution of the fuel from the fuel storage tank from the anode side distributing unit input line with a pump through the anode side distributing unit to fuel cell stacks consisting of many cells that have as may distribution points as the number of the stacks, collecting the fuel from the fuel cell stacks in a collecting unit that has as many inputs as the fuel cell stacks and then sending it back to fuel tank, removing of small amount of the hydrogen in the anode side collecting unit output line (11a) to air as a result of being above (preferably 0.5-10 cm) the solution of the anode side collecting unit output line, mixing the fuel freed from hydrogen with the fuel in the fuel tank and then feeding the mixed fuel to the anode again, the distribution of the oxidant from the oxidant storage tank by a pump from cathode side distributing unit input line with distributing unit that has more than one distribution point to fuel cell stacks consisting of more than one cell, collecting the oxidant from the fuel cell stacks in a collecting unit that has as many inputs as the number of the stacks in the fuel cell and then sending it back to the oxidant tank, the removal of small amount of oxygen in the oxidant side collecting unit output line (11b) to air as a result of being above (preferably 0.5-10 cm) the solution of the cathode side collecting unit output line, mixing the oxidant freed from oxygen with the oxidant in the oxidant tank, and then sending the mixture to the cathode again, and then repeating the procedures.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of direct sodium borohydride fuel cell system.    Pumps (3a, 3b)    Anode (4a)    Cathode (4b)    Distributing units (5a, 5b)    Collecting units (10a, 10b)    Anode side collecting unit output line (11a)    Oxidant side collecting unit output line (11b)    Fuel feed line (12)