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 - A 1937 John Deere Unstuck - by Gary Hickman. Here is my story of how I got the pistons out of a 1937 JD B that the engine had been stuck for about 14 years: About 12 years ago my Dad gave me one of the tractors I ran as I was growing up on our farm in central Nebraska. The engine on this tractor, a 1937 John Deere "B", had been stuck for 2 years before he gave it to me. This last spring (1999) I hauled the tractor to our 2 acre lot in St. Libory Nebraska where it joined my antique machinery collection, at that time a 1929 Caterpillar T
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