NOVELTY - Electrochemical cell (20) comprises anode (22) including an anode can and an anode material; cathode (54) including a cathode can, a cathode assembly, and a separator; sealing disposed between the cathode sidewall and the anode side wall at one end of the cell to prevent leakage of anode material; and insulating element, separate from the sealing element, extends upstream from the sealing element between the anode can and the cathode can.    USE - Used as button-size metal-air cells of the zinc-air type.    ADVANTAGE - The cell includes a seal that prevents electrolyte leakage while increasing the volume of active material.    DETAILED DESCRIPTION - Electrochemical cell comprises an anode and a cathode. The anode includes an anode can (24) having top wall (28) and annular side wall (30) extending axially downstream to define an anode cavity, and an anode material (26) disposed within the anode cavity. The cathode includes a cathode can (58) having bottom wall (60) and annular side wall (62) extending axially upstream, with the cathode side wall overlapping the anode side wall such that the anode can is received by the cathode can to enclose the anode cavity; cathode assembly (56) disposed adjacent the bottom wall of the cathode can; and separator (61) disposed between the cathode and anode cavity. A sealing element is disposed between the cathode side wall and the anode side wall at one end of the cell to prevent leakage of anode material. An insulating element, separate from the sealing element, extends upstream from the sealing element between the anode can and the cathode can. An INDEPENDENT CLAIM is also included for a sealed container comprising:    (a) first metal can having a first diameter;    (b) second metal can having a second diameter greater than the first diameter such that the first metal can is fitted inside the second metal can defining an interface between the first and second cans;    (c) sealing element disposed at the interface to create a seal between the cans and a sealed cavity inside the first can; and    (d) insulating element disposed between the first and second cans at a location of the interface not occupied by the sealing element to provide electrical insulation between the first and second cans.    DESCRIPTION OF DRAWING(S) - The figure shows a sectional side elevation view of button cell having increased internal volume.    Electrochemical cell (20)    Anode (22)    Anode can (24)    Anode material (26)    Top wall (28)    Annular side walls (30,62)    Cathode (54)    Cathode assembly (56)    Cathode can (58)    Bottom wall (60)    Separator (61)    Insulator (73)    Gasket (74)