Rejuvenating Dry Cells
"THE following will, I think, enable dry cell users to get. the last kick out of their batteries (writes Mr. W. H. Davies, Christchurch).:-Drill a small hole through the sealing compound in the top of the cells, and be sure the drill touches the manganese, as some of these cells are double sealed. Put a few drops of liquid ammonia into each cell with a medicine dropper. When this has soaked in séal the holes with paraffin or sealing wax.’ I noticed this tip in the "Popular Mechanics," and have found it to work with rundown flash light cells with considerable success.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19290913.2.75
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Radio Record, Volume III, Issue 9, 13 September 1929, Page 29
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105Rejuvenating Dry Cells Radio Record, Volume III, Issue 9, 13 September 1929, Page 29
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