Abstract: A pole bushing for batteries extends through the battery cover and forms a seal between the cover and the battery post. The bushing comprises a metal sleeve which is embedded in a sealing material to form a sealing element with an external surface which bears against the battery cover, and with an internal surface which at least partially is in close contact with the post passing through the cover. The metal sleeve is provided with grooves on its outside or inside to increase the sealing distance for contact between the sleeve and sealing material. One end portion of the sleeve extends out of the sealing material and forms an annular portion, the internal surface of which is for metallic connection to the post. The inventive sealing material is made of a resilient material, and the external surface of the sealing element is formed for contact with, and providing a sealing surface against the battery cover.

Abstract: In a central liquid replenishment system for accumulator cells (1,2) each cell is connected to an inflow conduit (9) for battery liquid and comprises means (7,8,10) permitting the battery liquid to the flow past the cell when the electrolyte level in the cell is normal. The inflow conduit communicates with a central supply (19) for battery liquid and with a suction device generating an underpressure in the system, causing battery liquid to flow to the cells. The replenishment container (16) for battery liquid is arranged at a level such that the liquid level in the container is substantially the same as in the cells. The pressure conditions in the accumulator, and thus its replenishment characteristics will therefore be independent of the relative positions of the central supply and the accumulator.