Copper cored intercell connecting elements which pass through cell partitions are welded on either side to upwardly depending posts from plate connector straps. The connector portion has a flange on one side of the partition and threading through to the other side, on which a washer-nut is tightened. Sealant is supplied in and around the cavity between the flange, the partition, and the washer-nut by means of a channel down through the partition from the top thereof.
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