NOVELTY - A storage battery module consists of nickel hydride storage batteries (10) mutually connected in series. Each battery is equipped with an electrode group (14) formed by wounding a positive electrode (11) and a negative electrode (12). The electrode group and alkali electrolyte solution are accommodated in an exterior component (22). The quantity of electrolyte is 2.4-3.3 g/Ah per unit positive electrode capacitance. The electrolyte comprises tungsten compound, molybdenum compound, and/or niobium compound in an amount of 20-50 mg/g electrolyte.    USE - Storage battery module is used for storage battery systems installed in engine compartments of vehicles (all claimed).    ADVANTAGE - The storage battery module has excellent durability regardless of the mounting direction. Even when used in vehicle-mounted storage battery systems, deterioration of lead acid battery is suppressed.    DETAILED DESCRIPTION - A storage battery module consists of nickel hydride storage batteries mutually connected in series. Each adjacent nickel hydride storage battery is connected in series such that a positive electrode terminal and a negative electrode terminal mutually invert vertically. Each nickel hydride storage battery is equipped with an electrode group formed by wounding a positive electrode and a negative electrode in a state mutually insulated through a separator (13). The positive electrode current collector (21) and the negative electrode collector (20) at provided at both ends in the axial direction. The electrode group and alkali electrolyte solution are accommodated in an exterior component whose end in opened. A sealant (23) is attached in a state electrically insulated with the exterior component such that the opening (25) is sealed. The positive electrode current collector or negative electrode collector is electrically connected to the sealant. The quantity of alkali electrolyte solution is 2.4-3.3 g/Ah per unit positive electrode capacitance. The alkali electrolyte solution comprises tungsten compound, molybdenum compound, and/or niobium compound in an amount of 20-50 mg/alkali electrolyte solution. An INDEPENDENT CLAIM is included for storage battery system.    DESCRIPTION OF DRAWING(S) - The drawing shows a longitudinal cross-sectional view of the nickel hydride storage battery.    Nickel hydride storage battery (10)    Positive electrode (11)    Negative electrode (12)    Separator (13)    Electrode group (14)    Negative electrode collector (20)    Positive-electrode current collector (21)    Exterior component (22)    Sealant (23)    Opening (25)