(US4670362-A)      A sealed galvanic cell comprises an anode, cathode and a cylindrical can. The open tap end of the can has an inwardly-extending bead. A seal member is held by a crimp formed at the top edge of the can. The top edge of the can extends over the top of the member. The seal members has an upper portion, a centrally-disposed thicker portion through which a current collector is inserted, and an inwardly directed shoulder in the periphery of the member. The shoulder is subtended by a downwardly and outwardly extended skirt. The skirt has a dia. greater than the dia. of the bead. A circular recess is formed on teh underside of teh seal member between the skirt portion and the centrally disposed portion whereby the skirt portion may be flexed inwardly past the bead.    ADVANTAGE -   The seal can be snap-fitted into the can prior to crimping. (4pp)a    (DE3320714-C)      Sealed battery e.g. alkaline primary cell has a sealing top which fits into the open top of the cylindrical battery can and can be fixed that by flanging. The top (36) has an upper region and an inwards-directed shoulder at the edge, forming a dia. equal to or slightly smaller than the dia. of the can at the level of an inwards facing bead (62) on the can. The top is of a material elastic enough to lock over the bead. The shoulder is adjoining by a lower rim (54) and part of the dia. of the shoulder is larger than that of the bead.    ADVANTAGE -   Snap fit, avoiding loss of cell vapours.    (JP93034777-B)      A leakproof battery comprises an anode, a cathode and a cylindrical casing closed at its lower end and open at the top. Near its upper rim the casing is necked inwards. The battery is sealed at the top by pushing a leakproof closure into the casing and crimping its rim over the outer portion of the upper surface of the closure.    Used esp. in prim. alkaline batteries. The batteries can be assembled more accurately, their internal volume can be greater, and they retain their leakproof seal during storage or use at extremes of temp.. (J59008265-A)