(EP660430-A2)      The method involves positioning a cover on the container, while the cover has a first and second opening in it, followed by overlying each of the battery's elements. The first opening lays near one side of the battery on one side of a centre line of the battery and the second opening lying near another side of the battery opposite the one side and on the opposite side of the centre line.    The method further entails laying the battery on the one side such that the second opening is above the first opening, with subsequent introducing electrolyte into the container through the first opening. The electrolyte is then allowed to capillary rise throughout the element so as to wet the entire internal surface of the mats.    USE/ADVANTAGE -   In lead-acid storage batteries. Simple and effective filling of mat-immobilised-electrolyte with without danger of trapping of air and pickling gases within cell element during filling with heat dissipation during process.    (EP660430-B1)      A method of assembling a mat-immobilised-electrolyte Pb-acid storage battery (8) comprising the principle steps of assembling a galvanic cell element containing compressible, absorbent mats sandwiched between positive and negative polarity electrodes, compressing said element so as to compress said mats, inserting at least one said compressed element into a container (10), and impregnating said element with an electrolyte (4) while in said container (10), characterised in that the method includes the steps of positioning a cover (16) on said container (10), said cover (16) having a first opening (22) and a second opening (24) therein overlying each element of said battery, said first opening (22) lying near one side of said battery (8) on one side of a centreline of said battery (8) and said second opening (24) lying near another side of said battery (8) opposite said one side and on the opposite side of said centreline; laying said battery (8) on said one side so that said second opening (24) is above said first opening (22); introducing electrolyte (4) into said container (10) through said first opening (22); allowing said electrolyte (4) to capillarity rise throughout said element so as to wet substantially the entire internal surface of said mats at substantially the absorption rate of said electrolyte (4) in said mat, but without completely saturating said element; displacing any gases in said container (10) with said rising electrolyte (4) and venting them from said container (10) through said second opening (24); placing said battery (8) in an upright position such that said openings (22, 24) overlie said element; adding additional electrolyte (4) to said battery (8) sufficient to ensure substantially complete wetting of said electrodes; and covering said openings (22, 24).