NOVELTY - A flat-form alkali primary battery (1) has a cathode can (3), an anode can (2), a separator (6) and a gasket. The opening portion of cathode can is fitted to the opening portion of the anode can. The cathode can and the anode can are sealed through the gasket, and the separator is arranged in sealing space. The separator is interposed between the anode mix (5) and cathode mix. The anode mix essentially consists of nickel-oxy-hydroxide, and is arranged in the anode side. The cathode mix essentially consists of zinc-alloy powder, and is arranged in the cathode side.    USE - Flat-form alkali primary battery is used for power supply of electronic device such as electronic wrist watch and portable electronic computer.    ADVANTAGE - The flat-form alkali primary battery is economical, and has large battery capacity and favorable closed-circuit-voltage characteristics.    DETAILED DESCRIPTION - A flat-form alkali primary battery has a cathode can, an anode can, a separator and a gasket. The opening portion of cathode can is fitted to the opening portion of the anode can. The cathode can and the anode can are sealed through the gasket, and the separator is arranged in sealing space. The separator is interposed between the anode mix and the cathode mix. The anode mix essentially consists of nickel-oxy-hydroxide, and is arranged in the anode side. The cathode mix essentially consists of zinc-alloy powder, and is arranged in the cathode side. The sealing space is filled with alkali electrolyte solution. The ratio of zinc-alloy powder with respect to the cathode mix is 65-75 mass%. The ratio of alkali electrolyte solution with respect to cathode mix is 20-31 mass%. The carboxymethyl cellulose is used as thickener of alkali electrolyte solution. The zinc-alloy powder contains aluminum, bismuth and indium.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of the flat-form alkali primary battery.    Flat form alkali primary battery (1)    Anode can (2)    Cathode can (3)    Anode mix (5)    Separator (6)