The lead sulfate bridges that form between positive plates and negative plates are derived from the sulfuric acid of the electrolyte, the lead dissolved from the plates, and oxygen derived from the water in the plates as hydrogen is driven off. This conductive material shorts the plates because it grows toward the potential voltage between them. Sponge Lead sulfate is what one plate is made from (today) and sponge lead is the other. (when charged) when discharged both plates become covered with lead sulfate, making only a very damped chemical reaction. Dropping them has a small chance of breaking the "bridge" off of the plates, or exploding the battery right in front center of a human being. Really dead batteries from 70 years ago (I've seen them) had buildup under the plates so thick that the plates were shorted by the sludge in the bottom. Newer batteries have reservoirs under the plates to "store" flaking PbSO4 (lead sulfate). Jim
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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