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 - The River Tractor - by Charlie English Jr.. This is a 4010 John Deere that was used to farm on the Diamond Island which is in the Ohio River about 15 miles southwest of Evansville, Indiana. About ten years ago, this tractor was parked close to the bank as the river was washing the bank of the island away.
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